1 /***************************************************************************/ 2 /* */ 3 /* ttobjs.c */ 4 /* */ 5 /* Objects manager (body). */ 6 /* */ 7 /* Copyright 1996-2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 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 FT_INTERNAL_DEBUG_H 21 #include FT_INTERNAL_STREAM_H 22 #include FT_TRUETYPE_TAGS_H 23 #include FT_INTERNAL_SFNT_H 24 25 #include "ttgload.h" 26 #include "ttpload.h" 27 28 #include "tterrors.h" 29 30 #ifdef TT_USE_BYTECODE_INTERPRETER 31 #include "ttinterp.h" 32 #endif 33 34 #ifdef TT_CONFIG_OPTION_UNPATENTED_HINTING 35 #include FT_TRUETYPE_UNPATENTED_H 36 #endif 37 38 #ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT 39 #include "ttgxvar.h" 40 #endif 41 42 /*************************************************************************/ 43 /* */ 44 /* The macro FT_COMPONENT is used in trace mode. It is an implicit */ 45 /* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */ 46 /* messages during execution. */ 47 /* */ 48 #undef FT_COMPONENT 49 #define FT_COMPONENT trace_ttobjs 50 51 52 #ifdef TT_USE_BYTECODE_INTERPRETER 53 54 /*************************************************************************/ 55 /* */ 56 /* GLYPH ZONE FUNCTIONS */ 57 /* */ 58 /*************************************************************************/ 59 60 61 /*************************************************************************/ 62 /* */ 63 /* <Function> */ 64 /* tt_glyphzone_done */ 65 /* */ 66 /* <Description> */ 67 /* Deallocate a glyph zone. */ 68 /* */ 69 /* <Input> */ 70 /* zone :: A pointer to the target glyph zone. */ 71 /* */ 72 FT_LOCAL_DEF( void ) 73 tt_glyphzone_done( TT_GlyphZone zone ) 74 { 75 FT_Memory memory = zone->memory; 76 77 78 if ( memory ) 79 { 80 FT_FREE( zone->contours ); 81 FT_FREE( zone->tags ); 82 FT_FREE( zone->cur ); 83 FT_FREE( zone->org ); 84 FT_FREE( zone->orus ); 85 86 zone->max_points = zone->n_points = 0; 87 zone->max_contours = zone->n_contours = 0; 88 zone->memory = NULL; 89 } 90 } 91 92 93 /*************************************************************************/ 94 /* */ 95 /* <Function> */ 96 /* tt_glyphzone_new */ 97 /* */ 98 /* <Description> */ 99 /* Allocate a new glyph zone. */ 100 /* */ 101 /* <Input> */ 102 /* memory :: A handle to the current memory object. */ 103 /* */ 104 /* maxPoints :: The capacity of glyph zone in points. */ 105 /* */ 106 /* maxContours :: The capacity of glyph zone in contours. */ 107 /* */ 108 /* <Output> */ 109 /* zone :: A pointer to the target glyph zone record. */ 110 /* */ 111 /* <Return> */ 112 /* FreeType error code. 0 means success. */ 113 /* */ 114 FT_LOCAL_DEF( FT_Error ) 115 tt_glyphzone_new( FT_Memory memory, 116 FT_UShort maxPoints, 117 FT_Short maxContours, 118 TT_GlyphZone zone ) 119 { 120 FT_Error error; 121 122 123 FT_MEM_ZERO( zone, sizeof ( *zone ) ); 124 zone->memory = memory; 125 126 if ( FT_NEW_ARRAY( zone->org, maxPoints ) || 127 FT_NEW_ARRAY( zone->cur, maxPoints ) || 128 FT_NEW_ARRAY( zone->orus, maxPoints ) || 129 FT_NEW_ARRAY( zone->tags, maxPoints ) || 130 FT_NEW_ARRAY( zone->contours, maxContours ) ) 131 { 132 tt_glyphzone_done( zone ); 133 } 134 else 135 { 136 zone->max_points = maxPoints; 137 zone->max_contours = maxContours; 138 } 139 140 return error; 141 } 142 #endif /* TT_USE_BYTECODE_INTERPRETER */ 143 144 145 /* Compare the face with a list of well-known `tricky' fonts. */ 146 /* This list shall be expanded as we find more of them. */ 147 148 static FT_Bool 149 tt_check_trickyness( FT_String* name ) 150 { 151 #define TRICK_NAMES_MAX_CHARACTERS 16 152 #define TRICK_NAMES_COUNT 7 153 static const char trick_names[TRICK_NAMES_COUNT][TRICK_NAMES_MAX_CHARACTERS+1] = 154 { 155 "DFKaiSho-SB", /* dfkaisb.ttf */ 156 "DFKaiShu", 157 "DFKai-SB", /* kaiu.ttf */ 158 "HuaTianSongTi?", /* htst3.ttf */ 159 "MingLiU", /* mingliu.ttf & mingliu.ttc */ 160 "PMingLiU", /* mingliu.ttc */ 161 "MingLi43", /* mingli.ttf */ 162 }; 163 int nn; 164 165 166 if ( !name ) 167 return FALSE; 168 169 /* Note that we only check the face name at the moment; it might */ 170 /* be worth to do more checks for a few special cases. */ 171 for ( nn = 0; nn < TRICK_NAMES_COUNT; nn++ ) 172 if ( ft_strstr( name, trick_names[nn] ) ) 173 return TRUE; 174 175 return FALSE; 176 } 177 178 179 /*************************************************************************/ 180 /* */ 181 /* <Function> */ 182 /* tt_face_init */ 183 /* */ 184 /* <Description> */ 185 /* Initialize a given TrueType face object. */ 186 /* */ 187 /* <Input> */ 188 /* stream :: The source font stream. */ 189 /* */ 190 /* face_index :: The index of the font face in the resource. */ 191 /* */ 192 /* num_params :: Number of additional generic parameters. Ignored. */ 193 /* */ 194 /* params :: Additional generic parameters. Ignored. */ 195 /* */ 196 /* <InOut> */ 197 /* face :: The newly built face object. */ 198 /* */ 199 /* <Return> */ 200 /* FreeType error code. 0 means success. */ 201 /* */ 202 FT_LOCAL_DEF( FT_Error ) 203 tt_face_init( FT_Stream stream, 204 FT_Face ttface, /* TT_Face */ 205 FT_Int face_index, 206 FT_Int num_params, 207 FT_Parameter* params ) 208 { 209 FT_Error error; 210 FT_Library library; 211 SFNT_Service sfnt; 212 TT_Face face = (TT_Face)ttface; 213 214 215 library = ttface->driver->root.library; 216 sfnt = (SFNT_Service)FT_Get_Module_Interface( library, "sfnt" ); 217 if ( !sfnt ) 218 goto Bad_Format; 219 220 /* create input stream from resource */ 221 if ( FT_STREAM_SEEK( 0 ) ) 222 goto Exit; 223 224 /* check that we have a valid TrueType file */ 225 error = sfnt->init_face( stream, face, face_index, num_params, params ); 226 if ( error ) 227 goto Exit; 228 229 /* We must also be able to accept Mac/GX fonts, as well as OT ones. */ 230 /* The 0x00020000 tag is completely undocumented; some fonts from */ 231 /* Arphic made for Chinese Windows 3.1 have this. */ 232 if ( face->format_tag != 0x00010000L && /* MS fonts */ 233 face->format_tag != 0x00020000L && /* CJK fonts for Win 3.1 */ 234 face->format_tag != TTAG_true ) /* Mac fonts */ 235 { 236 FT_TRACE2(( "[not a valid TTF font]\n" )); 237 goto Bad_Format; 238 } 239 240 #ifdef TT_USE_BYTECODE_INTERPRETER 241 ttface->face_flags |= FT_FACE_FLAG_HINTER; 242 #endif 243 244 /* If we are performing a simple font format check, exit immediately. */ 245 if ( face_index < 0 ) 246 return TT_Err_Ok; 247 248 /* Load font directory */ 249 error = sfnt->load_face( stream, face, face_index, num_params, params ); 250 if ( error ) 251 goto Exit; 252 253 if ( tt_check_trickyness( ttface->family_name ) ) 254 ttface->face_flags |= FT_FACE_FLAG_TRICKY; 255 256 error = tt_face_load_hdmx( face, stream ); 257 if ( error ) 258 goto Exit; 259 260 if ( FT_IS_SCALABLE( ttface ) ) 261 { 262 263 #ifdef FT_CONFIG_OPTION_INCREMENTAL 264 265 if ( !ttface->internal->incremental_interface ) 266 error = tt_face_load_loca( face, stream ); 267 if ( !error ) 268 error = tt_face_load_cvt( face, stream ); 269 if ( !error ) 270 error = tt_face_load_fpgm( face, stream ); 271 if ( !error ) 272 error = tt_face_load_prep( face, stream ); 273 274 #else 275 276 if ( !error ) 277 error = tt_face_load_loca( face, stream ); 278 if ( !error ) 279 error = tt_face_load_cvt( face, stream ); 280 if ( !error ) 281 error = tt_face_load_fpgm( face, stream ); 282 if ( !error ) 283 error = tt_face_load_prep( face, stream ); 284 285 #endif 286 287 } 288 289 #if defined( TT_CONFIG_OPTION_UNPATENTED_HINTING ) && \ 290 !defined( TT_CONFIG_OPTION_BYTECODE_INTERPRETER ) 291 292 { 293 FT_Bool unpatented_hinting; 294 int i; 295 296 297 /* Determine whether unpatented hinting is to be used for this face. */ 298 unpatented_hinting = FT_BOOL 299 ( library->debug_hooks[FT_DEBUG_HOOK_UNPATENTED_HINTING] != NULL ); 300 301 for ( i = 0; i < num_params && !face->unpatented_hinting; i++ ) 302 if ( params[i].tag == FT_PARAM_TAG_UNPATENTED_HINTING ) 303 unpatented_hinting = TRUE; 304 305 if ( !unpatented_hinting ) 306 ttface->internal->ignore_unpatented_hinter = TRUE; 307 } 308 309 #endif /* TT_CONFIG_OPTION_UNPATENTED_HINTING && 310 !TT_CONFIG_OPTION_BYTECODE_INTERPRETER */ 311 312 /* initialize standard glyph loading routines */ 313 TT_Init_Glyph_Loading( face ); 314 315 Exit: 316 return error; 317 318 Bad_Format: 319 error = TT_Err_Unknown_File_Format; 320 goto Exit; 321 } 322 323 324 /*************************************************************************/ 325 /* */ 326 /* <Function> */ 327 /* tt_face_done */ 328 /* */ 329 /* <Description> */ 330 /* Finalize a given face object. */ 331 /* */ 332 /* <Input> */ 333 /* face :: A pointer to the face object to destroy. */ 334 /* */ 335 FT_LOCAL_DEF( void ) 336 tt_face_done( FT_Face ttface ) /* TT_Face */ 337 { 338 TT_Face face = (TT_Face)ttface; 339 FT_Memory memory; 340 FT_Stream stream; 341 SFNT_Service sfnt; 342 343 344 if ( !face ) 345 return; 346 347 memory = ttface->memory; 348 stream = ttface->stream; 349 sfnt = (SFNT_Service)face->sfnt; 350 351 /* for `extended TrueType formats' (i.e. compressed versions) */ 352 if ( face->extra.finalizer ) 353 face->extra.finalizer( face->extra.data ); 354 355 if ( sfnt ) 356 sfnt->done_face( face ); 357 358 /* freeing the locations table */ 359 tt_face_done_loca( face ); 360 361 tt_face_free_hdmx( face ); 362 363 /* freeing the CVT */ 364 FT_FREE( face->cvt ); 365 face->cvt_size = 0; 366 367 /* freeing the programs */ 368 FT_FRAME_RELEASE( face->font_program ); 369 FT_FRAME_RELEASE( face->cvt_program ); 370 face->font_program_size = 0; 371 face->cvt_program_size = 0; 372 373 #ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT 374 tt_done_blend( memory, face->blend ); 375 face->blend = NULL; 376 #endif 377 } 378 379 380 /*************************************************************************/ 381 /* */ 382 /* SIZE FUNCTIONS */ 383 /* */ 384 /*************************************************************************/ 385 386 #ifdef TT_USE_BYTECODE_INTERPRETER 387 388 /*************************************************************************/ 389 /* */ 390 /* <Function> */ 391 /* tt_size_run_fpgm */ 392 /* */ 393 /* <Description> */ 394 /* Run the font program. */ 395 /* */ 396 /* <Input> */ 397 /* size :: A handle to the size object. */ 398 /* */ 399 /* <Return> */ 400 /* FreeType error code. 0 means success. */ 401 /* */ 402 FT_LOCAL_DEF( FT_Error ) 403 tt_size_run_fpgm( TT_Size size ) 404 { 405 TT_Face face = (TT_Face)size->root.face; 406 TT_ExecContext exec; 407 FT_Error error; 408 409 410 /* debugging instances have their own context */ 411 if ( size->debug ) 412 exec = size->context; 413 else 414 exec = ( (TT_Driver)FT_FACE_DRIVER( face ) )->context; 415 416 if ( !exec ) 417 return TT_Err_Could_Not_Find_Context; 418 419 TT_Load_Context( exec, face, size ); 420 421 exec->callTop = 0; 422 exec->top = 0; 423 424 exec->period = 64; 425 exec->phase = 0; 426 exec->threshold = 0; 427 428 exec->instruction_trap = FALSE; 429 exec->F_dot_P = 0x10000L; 430 431 { 432 FT_Size_Metrics* metrics = &exec->metrics; 433 TT_Size_Metrics* tt_metrics = &exec->tt_metrics; 434 435 436 metrics->x_ppem = 0; 437 metrics->y_ppem = 0; 438 metrics->x_scale = 0; 439 metrics->y_scale = 0; 440 441 tt_metrics->ppem = 0; 442 tt_metrics->scale = 0; 443 tt_metrics->ratio = 0x10000L; 444 } 445 446 /* allow font program execution */ 447 TT_Set_CodeRange( exec, 448 tt_coderange_font, 449 face->font_program, 450 face->font_program_size ); 451 452 /* disable CVT and glyph programs coderange */ 453 TT_Clear_CodeRange( exec, tt_coderange_cvt ); 454 TT_Clear_CodeRange( exec, tt_coderange_glyph ); 455 456 if ( face->font_program_size > 0 ) 457 { 458 error = TT_Goto_CodeRange( exec, tt_coderange_font, 0 ); 459 460 if ( !error ) 461 error = face->interpreter( exec ); 462 } 463 else 464 error = TT_Err_Ok; 465 466 if ( !error ) 467 TT_Save_Context( exec, size ); 468 469 return error; 470 } 471 472 473 /*************************************************************************/ 474 /* */ 475 /* <Function> */ 476 /* tt_size_run_prep */ 477 /* */ 478 /* <Description> */ 479 /* Run the control value program. */ 480 /* */ 481 /* <Input> */ 482 /* size :: A handle to the size object. */ 483 /* */ 484 /* <Return> */ 485 /* FreeType error code. 0 means success. */ 486 /* */ 487 FT_LOCAL_DEF( FT_Error ) 488 tt_size_run_prep( TT_Size size ) 489 { 490 TT_Face face = (TT_Face)size->root.face; 491 TT_ExecContext exec; 492 FT_Error error; 493 494 495 /* debugging instances have their own context */ 496 if ( size->debug ) 497 exec = size->context; 498 else 499 exec = ( (TT_Driver)FT_FACE_DRIVER( face ) )->context; 500 501 if ( !exec ) 502 return TT_Err_Could_Not_Find_Context; 503 504 TT_Load_Context( exec, face, size ); 505 506 exec->callTop = 0; 507 exec->top = 0; 508 509 exec->instruction_trap = FALSE; 510 511 TT_Set_CodeRange( exec, 512 tt_coderange_cvt, 513 face->cvt_program, 514 face->cvt_program_size ); 515 516 TT_Clear_CodeRange( exec, tt_coderange_glyph ); 517 518 if ( face->cvt_program_size > 0 ) 519 { 520 error = TT_Goto_CodeRange( exec, tt_coderange_cvt, 0 ); 521 522 if ( !error && !size->debug ) 523 error = face->interpreter( exec ); 524 } 525 else 526 error = TT_Err_Ok; 527 528 /* save as default graphics state */ 529 size->GS = exec->GS; 530 531 TT_Save_Context( exec, size ); 532 533 return error; 534 } 535 536 #endif /* TT_USE_BYTECODE_INTERPRETER */ 537 538 539 #ifdef TT_USE_BYTECODE_INTERPRETER 540 541 static void 542 tt_size_done_bytecode( FT_Size ftsize ) 543 { 544 TT_Size size = (TT_Size)ftsize; 545 TT_Face face = (TT_Face)ftsize->face; 546 FT_Memory memory = face->root.memory; 547 548 549 if ( size->debug ) 550 { 551 /* the debug context must be deleted by the debugger itself */ 552 size->context = NULL; 553 size->debug = FALSE; 554 } 555 556 FT_FREE( size->cvt ); 557 size->cvt_size = 0; 558 559 /* free storage area */ 560 FT_FREE( size->storage ); 561 size->storage_size = 0; 562 563 /* twilight zone */ 564 tt_glyphzone_done( &size->twilight ); 565 566 FT_FREE( size->function_defs ); 567 FT_FREE( size->instruction_defs ); 568 569 size->num_function_defs = 0; 570 size->max_function_defs = 0; 571 size->num_instruction_defs = 0; 572 size->max_instruction_defs = 0; 573 574 size->max_func = 0; 575 size->max_ins = 0; 576 577 size->bytecode_ready = 0; 578 size->cvt_ready = 0; 579 } 580 581 582 /* Initialize bytecode-related fields in the size object. */ 583 /* We do this only if bytecode interpretation is really needed. */ 584 static FT_Error 585 tt_size_init_bytecode( FT_Size ftsize ) 586 { 587 FT_Error error; 588 TT_Size size = (TT_Size)ftsize; 589 TT_Face face = (TT_Face)ftsize->face; 590 FT_Memory memory = face->root.memory; 591 FT_Int i; 592 593 FT_UShort n_twilight; 594 TT_MaxProfile* maxp = &face->max_profile; 595 596 597 size->bytecode_ready = 1; 598 size->cvt_ready = 0; 599 600 size->max_function_defs = maxp->maxFunctionDefs; 601 size->max_instruction_defs = maxp->maxInstructionDefs; 602 603 size->num_function_defs = 0; 604 size->num_instruction_defs = 0; 605 606 size->max_func = 0; 607 size->max_ins = 0; 608 609 size->cvt_size = face->cvt_size; 610 size->storage_size = maxp->maxStorage; 611 612 /* Set default metrics */ 613 { 614 TT_Size_Metrics* metrics = &size->ttmetrics; 615 616 617 metrics->rotated = FALSE; 618 metrics->stretched = FALSE; 619 620 /* set default compensation (all 0) */ 621 for ( i = 0; i < 4; i++ ) 622 metrics->compensations[i] = 0; 623 } 624 625 /* allocate function defs, instruction defs, cvt, and storage area */ 626 if ( FT_NEW_ARRAY( size->function_defs, size->max_function_defs ) || 627 FT_NEW_ARRAY( size->instruction_defs, size->max_instruction_defs ) || 628 FT_NEW_ARRAY( size->cvt, size->cvt_size ) || 629 FT_NEW_ARRAY( size->storage, size->storage_size ) ) 630 goto Exit; 631 632 /* reserve twilight zone */ 633 n_twilight = maxp->maxTwilightPoints; 634 635 /* there are 4 phantom points (do we need this?) */ 636 n_twilight += 4; 637 638 error = tt_glyphzone_new( memory, n_twilight, 0, &size->twilight ); 639 if ( error ) 640 goto Exit; 641 642 size->twilight.n_points = n_twilight; 643 644 size->GS = tt_default_graphics_state; 645 646 /* set `face->interpreter' according to the debug hook present */ 647 { 648 FT_Library library = face->root.driver->root.library; 649 650 651 face->interpreter = (TT_Interpreter) 652 library->debug_hooks[FT_DEBUG_HOOK_TRUETYPE]; 653 if ( !face->interpreter ) 654 face->interpreter = (TT_Interpreter)TT_RunIns; 655 } 656 657 /* Fine, now run the font program! */ 658 error = tt_size_run_fpgm( size ); 659 660 Exit: 661 if ( error ) 662 tt_size_done_bytecode( ftsize ); 663 664 return error; 665 } 666 667 668 FT_LOCAL_DEF( FT_Error ) 669 tt_size_ready_bytecode( TT_Size size ) 670 { 671 FT_Error error = TT_Err_Ok; 672 673 674 if ( !size->bytecode_ready ) 675 { 676 error = tt_size_init_bytecode( (FT_Size)size ); 677 if ( error ) 678 goto Exit; 679 } 680 681 /* rescale CVT when needed */ 682 if ( !size->cvt_ready ) 683 { 684 FT_UInt i; 685 TT_Face face = (TT_Face)size->root.face; 686 687 688 /* Scale the cvt values to the new ppem. */ 689 /* We use by default the y ppem to scale the CVT. */ 690 for ( i = 0; i < size->cvt_size; i++ ) 691 size->cvt[i] = FT_MulFix( face->cvt[i], size->ttmetrics.scale ); 692 693 /* all twilight points are originally zero */ 694 for ( i = 0; i < (FT_UInt)size->twilight.n_points; i++ ) 695 { 696 size->twilight.org[i].x = 0; 697 size->twilight.org[i].y = 0; 698 size->twilight.cur[i].x = 0; 699 size->twilight.cur[i].y = 0; 700 } 701 702 /* clear storage area */ 703 for ( i = 0; i < (FT_UInt)size->storage_size; i++ ) 704 size->storage[i] = 0; 705 706 size->GS = tt_default_graphics_state; 707 708 error = tt_size_run_prep( size ); 709 if ( !error ) 710 size->cvt_ready = 1; 711 } 712 713 Exit: 714 return error; 715 } 716 717 #endif /* TT_USE_BYTECODE_INTERPRETER */ 718 719 720 /*************************************************************************/ 721 /* */ 722 /* <Function> */ 723 /* tt_size_init */ 724 /* */ 725 /* <Description> */ 726 /* Initialize a new TrueType size object. */ 727 /* */ 728 /* <InOut> */ 729 /* size :: A handle to the size object. */ 730 /* */ 731 /* <Return> */ 732 /* FreeType error code. 0 means success. */ 733 /* */ 734 FT_LOCAL_DEF( FT_Error ) 735 tt_size_init( FT_Size ttsize ) /* TT_Size */ 736 { 737 TT_Size size = (TT_Size)ttsize; 738 FT_Error error = TT_Err_Ok; 739 740 #ifdef TT_USE_BYTECODE_INTERPRETER 741 size->bytecode_ready = 0; 742 size->cvt_ready = 0; 743 #endif 744 745 size->ttmetrics.valid = FALSE; 746 size->strike_index = 0xFFFFFFFFUL; 747 748 return error; 749 } 750 751 752 /*************************************************************************/ 753 /* */ 754 /* <Function> */ 755 /* tt_size_done */ 756 /* */ 757 /* <Description> */ 758 /* The TrueType size object finalizer. */ 759 /* */ 760 /* <Input> */ 761 /* size :: A handle to the target size object. */ 762 /* */ 763 FT_LOCAL_DEF( void ) 764 tt_size_done( FT_Size ttsize ) /* TT_Size */ 765 { 766 TT_Size size = (TT_Size)ttsize; 767 768 769 #ifdef TT_USE_BYTECODE_INTERPRETER 770 if ( size->bytecode_ready ) 771 tt_size_done_bytecode( ttsize ); 772 #endif 773 774 size->ttmetrics.valid = FALSE; 775 } 776 777 778 /*************************************************************************/ 779 /* */ 780 /* <Function> */ 781 /* tt_size_reset */ 782 /* */ 783 /* <Description> */ 784 /* Reset a TrueType size when resolutions and character dimensions */ 785 /* have been changed. */ 786 /* */ 787 /* <Input> */ 788 /* size :: A handle to the target size object. */ 789 /* */ 790 FT_LOCAL_DEF( FT_Error ) 791 tt_size_reset( TT_Size size ) 792 { 793 TT_Face face; 794 FT_Error error = TT_Err_Ok; 795 FT_Size_Metrics* metrics; 796 797 798 size->ttmetrics.valid = FALSE; 799 800 face = (TT_Face)size->root.face; 801 802 metrics = &size->metrics; 803 804 /* copy the result from base layer */ 805 *metrics = size->root.metrics; 806 807 if ( metrics->x_ppem < 1 || metrics->y_ppem < 1 ) 808 return TT_Err_Invalid_PPem; 809 810 /* This bit flag, if set, indicates that the ppems must be */ 811 /* rounded to integers. Nearly all TrueType fonts have this bit */ 812 /* set, as hinting won't work really well otherwise. */ 813 /* */ 814 if ( face->header.Flags & 8 ) 815 { 816 metrics->x_scale = FT_DivFix( metrics->x_ppem << 6, 817 face->root.units_per_EM ); 818 metrics->y_scale = FT_DivFix( metrics->y_ppem << 6, 819 face->root.units_per_EM ); 820 821 metrics->ascender = 822 FT_PIX_ROUND( FT_MulFix( face->root.ascender, metrics->y_scale ) ); 823 metrics->descender = 824 FT_PIX_ROUND( FT_MulFix( face->root.descender, metrics->y_scale ) ); 825 metrics->height = 826 FT_PIX_ROUND( FT_MulFix( face->root.height, metrics->y_scale ) ); 827 metrics->max_advance = 828 FT_PIX_ROUND( FT_MulFix( face->root.max_advance_width, 829 metrics->x_scale ) ); 830 } 831 832 /* compute new transformation */ 833 if ( metrics->x_ppem >= metrics->y_ppem ) 834 { 835 size->ttmetrics.scale = metrics->x_scale; 836 size->ttmetrics.ppem = metrics->x_ppem; 837 size->ttmetrics.x_ratio = 0x10000L; 838 size->ttmetrics.y_ratio = FT_MulDiv( metrics->y_ppem, 839 0x10000L, 840 metrics->x_ppem ); 841 } 842 else 843 { 844 size->ttmetrics.scale = metrics->y_scale; 845 size->ttmetrics.ppem = metrics->y_ppem; 846 size->ttmetrics.x_ratio = FT_MulDiv( metrics->x_ppem, 847 0x10000L, 848 metrics->y_ppem ); 849 size->ttmetrics.y_ratio = 0x10000L; 850 } 851 852 #ifdef TT_USE_BYTECODE_INTERPRETER 853 size->cvt_ready = 0; 854 #endif /* TT_USE_BYTECODE_INTERPRETER */ 855 856 if ( !error ) 857 size->ttmetrics.valid = TRUE; 858 859 return error; 860 } 861 862 863 /*************************************************************************/ 864 /* */ 865 /* <Function> */ 866 /* tt_driver_init */ 867 /* */ 868 /* <Description> */ 869 /* Initialize a given TrueType driver object. */ 870 /* */ 871 /* <Input> */ 872 /* driver :: A handle to the target driver object. */ 873 /* */ 874 /* <Return> */ 875 /* FreeType error code. 0 means success. */ 876 /* */ 877 FT_LOCAL_DEF( FT_Error ) 878 tt_driver_init( FT_Module ttdriver ) /* TT_Driver */ 879 { 880 881 #ifdef TT_USE_BYTECODE_INTERPRETER 882 883 TT_Driver driver = (TT_Driver)ttdriver; 884 885 886 if ( !TT_New_Context( driver ) ) 887 return TT_Err_Could_Not_Find_Context; 888 889 #else 890 891 FT_UNUSED( ttdriver ); 892 893 #endif 894 895 return TT_Err_Ok; 896 } 897 898 899 /*************************************************************************/ 900 /* */ 901 /* <Function> */ 902 /* tt_driver_done */ 903 /* */ 904 /* <Description> */ 905 /* Finalize a given TrueType driver. */ 906 /* */ 907 /* <Input> */ 908 /* driver :: A handle to the target TrueType driver. */ 909 /* */ 910 FT_LOCAL_DEF( void ) 911 tt_driver_done( FT_Module ttdriver ) /* TT_Driver */ 912 { 913 #ifdef TT_USE_BYTECODE_INTERPRETER 914 TT_Driver driver = (TT_Driver)ttdriver; 915 916 917 /* destroy the execution context */ 918 if ( driver->context ) 919 { 920 TT_Done_Context( driver->context ); 921 driver->context = NULL; 922 } 923 #else 924 FT_UNUSED( ttdriver ); 925 #endif 926 927 } 928 929 930 /*************************************************************************/ 931 /* */ 932 /* <Function> */ 933 /* tt_slot_init */ 934 /* */ 935 /* <Description> */ 936 /* Initialize a new slot object. */ 937 /* */ 938 /* <InOut> */ 939 /* slot :: A handle to the slot object. */ 940 /* */ 941 /* <Return> */ 942 /* FreeType error code. 0 means success. */ 943 /* */ 944 FT_LOCAL_DEF( FT_Error ) 945 tt_slot_init( FT_GlyphSlot slot ) 946 { 947 return FT_GlyphLoader_CreateExtra( slot->internal->loader ); 948 } 949 950 951 /* END */ 952
