reactos/lib/3rdparty/freetype/src/cff/cf2ft.c

   1 /***************************************************************************/
   2 /*                                                                         */
   3 /*  cf2ft.c                                                                */
   4 /*                                                                         */
   5 /*    FreeType Glue Component to Adobe's Interpreter (body).               */
   6 /*                                                                         */
   7 /*  Copyright 2013-2014 Adobe Systems Incorporated.                        */
   8 /*                                                                         */
   9 /*  This software, and all works of authorship, whether in source or       */
  10 /*  object code form as indicated by the copyright notice(s) included      */
  11 /*  herein (collectively, the "Work") is made available, and may only be   */
  12 /*  used, modified, and distributed under the FreeType Project License,    */
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  14 /*  FreeType Project License, each contributor to the Work hereby grants   */
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  33 /*  FreeType Project License as well as those provided in this section,    */
  34 /*  and you accept them fully.                                             */
  35 /*                                                                         */
  36 /***************************************************************************/
  37
  38
  39 #include "cf2ft.h"
  40 #include FT_INTERNAL_DEBUG_H
  41
  42 #include "cf2font.h"
  43 #include "cf2error.h"
  44
  45
  46 #define CF2_MAX_SIZE  cf2_intToFixed( 2000 )    /* max ppem */
  47
  48
  49   /*
  50    * This check should avoid most internal overflow cases.  Clients should
  51    * generally respond to `Glyph_Too_Big' by getting a glyph outline
  52    * at EM size, scaling it and filling it as a graphics operation.
  53    *
  54    */
  55   static FT_Error
  56   cf2_checkTransform( const CF2_Matrix*  transform,
  57                       CF2_Int            unitsPerEm )
  58   {
  59     CF2_Fixed  maxScale;
  60
  61
  62     FT_ASSERT( unitsPerEm > 0 );
  63
  64     if ( transform->a <= 0 || transform->d <= 0 )
  65       return FT_THROW( Invalid_Size_Handle );
  66
  67     FT_ASSERT( transform->b == 0 && transform->c == 0 );
  68     FT_ASSERT( transform->tx == 0 && transform->ty == 0 );
  69
  70     if ( unitsPerEm > 0x7FFF )
  71       return FT_THROW( Glyph_Too_Big );
  72
  73     maxScale = FT_DivFix( CF2_MAX_SIZE, cf2_intToFixed( unitsPerEm ) );
  74
  75     if ( transform->a > maxScale || transform->d > maxScale )
  76       return FT_THROW( Glyph_Too_Big );
  77
  78     return FT_Err_Ok;
  79   }
  80
  81
  82   static void
  83   cf2_setGlyphWidth( CF2_Outline  outline,
  84                      CF2_Fixed    width )
  85   {
  86     CFF_Decoder*  decoder = outline->decoder;
  87
  88
  89     FT_ASSERT( decoder );
  90
  91     decoder->glyph_width = cf2_fixedToInt( width );
  92   }
  93
  94
  95   /* Clean up font instance. */
  96   static void
  97   cf2_free_instance( void*  ptr )
  98   {
  99     CF2_Font  font = (CF2_Font)ptr;
 100
 101
 102     if ( font )
 103     {
 104       FT_Memory  memory = font->memory;
 105
 106
 107       (void)memory;
 108     }
 109   }
 110
 111
 112   /********************************************/
 113   /*                                          */
 114   /* functions for handling client outline;   */
 115   /* FreeType uses coordinates in 26.6 format */
 116   /*                                          */
 117   /********************************************/
 118
 119   static void
 120   cf2_builder_moveTo( CF2_OutlineCallbacks      callbacks,
 121                       const CF2_CallbackParams  params )
 122   {
 123     /* downcast the object pointer */
 124     CF2_Outline   outline = (CF2_Outline)callbacks;
 125     CFF_Builder*  builder;
 126
 127     (void)params;        /* only used in debug mode */
 128
 129
 130     FT_ASSERT( outline && outline->decoder );
 131     FT_ASSERT( params->op == CF2_PathOpMoveTo );
 132
 133     builder = &outline->decoder->builder;
 134
 135     /* note: two successive moves simply close the contour twice */
 136     cff_builder_close_contour( builder );
 137     builder->path_begun = 0;
 138   }
 139
 140
 141   static void
 142   cf2_builder_lineTo( CF2_OutlineCallbacks      callbacks,
 143                       const CF2_CallbackParams  params )
 144   {
 145     FT_Error  error;
 146
 147     /* downcast the object pointer */
 148     CF2_Outline   outline = (CF2_Outline)callbacks;
 149     CFF_Builder*  builder;
 150
 151
 152     FT_ASSERT( outline && outline->decoder );
 153     FT_ASSERT( params->op == CF2_PathOpLineTo );
 154
 155     builder = &outline->decoder->builder;
 156
 157     if ( !builder->path_begun )
 158     {
 159       /* record the move before the line; also check points and set */
 160       /* `path_begun'                                               */
 161       error = cff_builder_start_point( builder,
 162                                        params->pt0.x,
 163                                        params->pt0.y );
 164       if ( error )
 165       {
 166         if ( !*callbacks->error )
 167           *callbacks->error =  error;
 168         return;
 169       }
 170     }
 171
 172     /* `cff_builder_add_point1' includes a check_points call for one point */
 173     error = cff_builder_add_point1( builder,
 174                                     params->pt1.x,
 175                                     params->pt1.y );
 176     if ( error )
 177     {
 178       if ( !*callbacks->error )
 179         *callbacks->error =  error;
 180       return;
 181     }
 182   }
 183
 184
 185   static void
 186   cf2_builder_cubeTo( CF2_OutlineCallbacks      callbacks,
 187                       const CF2_CallbackParams  params )
 188   {
 189     FT_Error  error;
 190
 191     /* downcast the object pointer */
 192     CF2_Outline   outline = (CF2_Outline)callbacks;
 193     CFF_Builder*  builder;
 194
 195
 196     FT_ASSERT( outline && outline->decoder );
 197     FT_ASSERT( params->op == CF2_PathOpCubeTo );
 198
 199     builder = &outline->decoder->builder;
 200
 201     if ( !builder->path_begun )
 202     {
 203       /* record the move before the line; also check points and set */
 204       /* `path_begun'                                               */
 205       error = cff_builder_start_point( builder,
 206                                        params->pt0.x,
 207                                        params->pt0.y );
 208       if ( error )
 209       {
 210         if ( !*callbacks->error )
 211           *callbacks->error =  error;
 212         return;
 213       }
 214     }
 215
 216     /* prepare room for 3 points: 2 off-curve, 1 on-curve */
 217     error = cff_check_points( builder, 3 );
 218     if ( error )
 219     {
 220       if ( !*callbacks->error )
 221         *callbacks->error =  error;
 222       return;
 223     }
 224
 225     cff_builder_add_point( builder,
 226                            params->pt1.x,
 227                            params->pt1.y, 0 );
 228     cff_builder_add_point( builder,
 229                            params->pt2.x,
 230                            params->pt2.y, 0 );
 231     cff_builder_add_point( builder,
 232                            params->pt3.x,
 233                            params->pt3.y, 1 );
 234   }
 235
 236
 237   static void
 238   cf2_outline_init( CF2_Outline  outline,
 239                     FT_Memory    memory,
 240                     FT_Error*    error )
 241   {
 242     FT_MEM_ZERO( outline, sizeof ( CF2_OutlineRec ) );
 243
 244     outline->root.memory = memory;
 245     outline->root.error  = error;
 246
 247     outline->root.moveTo = cf2_builder_moveTo;
 248     outline->root.lineTo = cf2_builder_lineTo;
 249     outline->root.cubeTo = cf2_builder_cubeTo;
 250   }
 251
 252
 253   /* get scaling and hint flag from GlyphSlot */
 254   static void
 255   cf2_getScaleAndHintFlag( CFF_Decoder*  decoder,
 256                            CF2_Fixed*    x_scale,
 257                            CF2_Fixed*    y_scale,
 258                            FT_Bool*      hinted,
 259                            FT_Bool*      scaled )
 260   {
 261     FT_ASSERT( decoder && decoder->builder.glyph );
 262
 263     /* note: FreeType scale includes a factor of 64 */
 264     *hinted = decoder->builder.glyph->hint;
 265     *scaled = decoder->builder.glyph->scaled;
 266
 267     if ( *hinted )
 268     {
 269       *x_scale = ( decoder->builder.glyph->x_scale + 32 ) / 64;
 270       *y_scale = ( decoder->builder.glyph->y_scale + 32 ) / 64;
 271     }
 272     else
 273     {
 274       /* for unhinted outlines, `cff_slot_load' does the scaling, */
 275       /* thus render at `unity' scale                             */
 276
 277       *x_scale = 0x0400;   /* 1/64 as 16.16 */
 278       *y_scale = 0x0400;
 279     }
 280   }
 281
 282
 283   /* get units per em from `FT_Face' */
 284   /* TODO: should handle font matrix concatenation? */
 285   static FT_UShort
 286   cf2_getUnitsPerEm( CFF_Decoder*  decoder )
 287   {
 288     FT_ASSERT( decoder && decoder->builder.face );
 289     FT_ASSERT( decoder->builder.face->root.units_per_EM );
 290
 291     return decoder->builder.face->root.units_per_EM;
 292   }
 293
 294
 295   /* Main entry point: Render one glyph. */
 296   FT_LOCAL_DEF( FT_Error )
 297   cf2_decoder_parse_charstrings( CFF_Decoder*  decoder,
 298                                  FT_Byte*      charstring_base,
 299                                  FT_ULong      charstring_len )
 300   {
 301     FT_Memory  memory;
 302     FT_Error   error = FT_Err_Ok;
 303     CF2_Font   font;
 304
 305
 306     FT_ASSERT( decoder && decoder->cff );
 307
 308     memory = decoder->builder.memory;
 309
 310     /* CF2 data is saved here across glyphs */
 311     font = (CF2_Font)decoder->cff->cf2_instance.data;
 312
 313     /* on first glyph, allocate instance structure */
 314     if ( decoder->cff->cf2_instance.data == NULL )
 315     {
 316       decoder->cff->cf2_instance.finalizer =
 317         (FT_Generic_Finalizer)cf2_free_instance;
 318
 319       if ( FT_ALLOC( decoder->cff->cf2_instance.data,
 320                      sizeof ( CF2_FontRec ) ) )
 321         return FT_THROW( Out_Of_Memory );
 322
 323       font = (CF2_Font)decoder->cff->cf2_instance.data;
 324
 325       font->memory = memory;
 326
 327       /* initialize a client outline, to be shared by each glyph rendered */
 328       cf2_outline_init( &font->outline, font->memory, &font->error );
 329     }
 330
 331     /* save decoder; it is a stack variable and will be different on each */
 332     /* call                                                               */
 333     font->decoder         = decoder;
 334     font->outline.decoder = decoder;
 335
 336     {
 337       /* build parameters for Adobe engine */
 338
 339       CFF_Builder*  builder = &decoder->builder;
 340       CFF_Driver    driver  = (CFF_Driver)FT_FACE_DRIVER( builder->face );
 341
 342       /* local error */
 343       FT_Error       error2 = FT_Err_Ok;
 344       CF2_BufferRec  buf;
 345       CF2_Matrix     transform;
 346       CF2_F16Dot16   glyphWidth;
 347
 348       FT_Bool  hinted;
 349       FT_Bool  scaled;
 350
 351
 352       /* FreeType has already looked up the GID; convert to         */
 353       /* `RegionBuffer', assuming that the input has been validated */
 354       FT_ASSERT( charstring_base + charstring_len >= charstring_base );
 355
 356       FT_ZERO( &buf );
 357       buf.start =
 358       buf.ptr   = charstring_base;
 359       buf.end   = charstring_base + charstring_len;
 360
 361       FT_ZERO( &transform );
 362
 363       cf2_getScaleAndHintFlag( decoder,
 364                                &transform.a,
 365                                &transform.d,
 366                                &hinted,
 367                                &scaled );
 368
 369       font->renderingFlags = 0;
 370       if ( hinted )
 371         font->renderingFlags |= CF2_FlagsHinted;
 372       if ( scaled && !driver->no_stem_darkening )
 373         font->renderingFlags |= CF2_FlagsDarkened;
 374
 375       font->darkenParams[0] = driver->darken_params[0];
 376       font->darkenParams[1] = driver->darken_params[1];
 377       font->darkenParams[2] = driver->darken_params[2];
 378       font->darkenParams[3] = driver->darken_params[3];
 379       font->darkenParams[4] = driver->darken_params[4];
 380       font->darkenParams[5] = driver->darken_params[5];
 381       font->darkenParams[6] = driver->darken_params[6];
 382       font->darkenParams[7] = driver->darken_params[7];
 383
 384       /* now get an outline for this glyph;      */
 385       /* also get units per em to validate scale */
 386       font->unitsPerEm = (CF2_Int)cf2_getUnitsPerEm( decoder );
 387
 388       if ( scaled )
 389       {
 390         error2 = cf2_checkTransform( &transform, font->unitsPerEm );
 391         if ( error2 )
 392           return error2;
 393       }
 394
 395       error2 = cf2_getGlyphOutline( font, &buf, &transform, &glyphWidth );
 396       if ( error2 )
 397         return FT_ERR( Invalid_File_Format );
 398
 399       cf2_setGlyphWidth( &font->outline, glyphWidth );
 400
 401       return FT_Err_Ok;
 402     }
 403   }
 404
 405
 406   /* get pointer to current FreeType subfont (based on current glyphID) */
 407   FT_LOCAL_DEF( CFF_SubFont )
 408   cf2_getSubfont( CFF_Decoder*  decoder )
 409   {
 410     FT_ASSERT( decoder && decoder->current_subfont );
 411
 412     return decoder->current_subfont;
 413   }
 414
 415
 416   /* get `y_ppem' from `CFF_Size' */
 417   FT_LOCAL_DEF( CF2_Fixed )
 418   cf2_getPpemY( CFF_Decoder*  decoder )
 419   {
 420     FT_ASSERT( decoder                          &&
 421                decoder->builder.face            &&
 422                decoder->builder.face->root.size );
 423
 424     /*
 425      * Note that `y_ppem' can be zero if there wasn't a call to
 426      * `FT_Set_Char_Size' or something similar.  However, this isn't a
 427      * problem since we come to this place in the code only if
 428      * FT_LOAD_NO_SCALE is set (the other case gets caught by
 429      * `cf2_checkTransform').  The ppem value is needed to compute the stem
 430      * darkening, which is disabled for getting the unscaled outline.
 431      *
 432      */
 433     return cf2_intToFixed(
 434              decoder->builder.face->root.size->metrics.y_ppem );
 435   }
 436
 437
 438   /* get standard stem widths for the current subfont; */
 439   /* FreeType stores these as integer font units       */
 440   /* (note: variable names seem swapped)               */
 441   FT_LOCAL_DEF( CF2_Fixed )
 442   cf2_getStdVW( CFF_Decoder*  decoder )
 443   {
 444     FT_ASSERT( decoder && decoder->current_subfont );
 445
 446     return cf2_intToFixed(
 447              decoder->current_subfont->private_dict.standard_height );
 448   }
 449
 450
 451   FT_LOCAL_DEF( CF2_Fixed )
 452   cf2_getStdHW( CFF_Decoder*  decoder )
 453   {
 454     FT_ASSERT( decoder && decoder->current_subfont );
 455
 456     return cf2_intToFixed(
 457              decoder->current_subfont->private_dict.standard_width );
 458   }
 459
 460
 461   /* note: FreeType stores 1000 times the actual value for `BlueScale' */
 462   FT_LOCAL_DEF( void )
 463   cf2_getBlueMetrics( CFF_Decoder*  decoder,
 464                       CF2_Fixed*    blueScale,
 465                       CF2_Fixed*    blueShift,
 466                       CF2_Fixed*    blueFuzz )
 467   {
 468     FT_ASSERT( decoder && decoder->current_subfont );
 469
 470     *blueScale = FT_DivFix(
 471                    decoder->current_subfont->private_dict.blue_scale,
 472                    cf2_intToFixed( 1000 ) );
 473     *blueShift = cf2_intToFixed(
 474                    decoder->current_subfont->private_dict.blue_shift );
 475     *blueFuzz  = cf2_intToFixed(
 476                    decoder->current_subfont->private_dict.blue_fuzz );
 477   }
 478
 479
 480   /* get blue values counts and arrays; the FreeType parser has validated */
 481   /* the counts and verified that each is an even number                  */
 482   FT_LOCAL_DEF( void )
 483   cf2_getBlueValues( CFF_Decoder*  decoder,
 484                      size_t*       count,
 485                      FT_Pos*      *data )
 486   {
 487     FT_ASSERT( decoder && decoder->current_subfont );
 488
 489     *count = decoder->current_subfont->private_dict.num_blue_values;
 490     *data  = (FT_Pos*)
 491                &decoder->current_subfont->private_dict.blue_values;
 492   }
 493
 494
 495   FT_LOCAL_DEF( void )
 496   cf2_getOtherBlues( CFF_Decoder*  decoder,
 497                      size_t*       count,
 498                      FT_Pos*      *data )
 499   {
 500     FT_ASSERT( decoder && decoder->current_subfont );
 501
 502     *count = decoder->current_subfont->private_dict.num_other_blues;
 503     *data  = (FT_Pos*)
 504                &decoder->current_subfont->private_dict.other_blues;
 505   }
 506
 507
 508   FT_LOCAL_DEF( void )
 509   cf2_getFamilyBlues( CFF_Decoder*  decoder,
 510                       size_t*       count,
 511                       FT_Pos*      *data )
 512   {
 513     FT_ASSERT( decoder && decoder->current_subfont );
 514
 515     *count = decoder->current_subfont->private_dict.num_family_blues;
 516     *data  = (FT_Pos*)
 517                &decoder->current_subfont->private_dict.family_blues;
 518   }
 519
 520
 521   FT_LOCAL_DEF( void )
 522   cf2_getFamilyOtherBlues( CFF_Decoder*  decoder,
 523                            size_t*       count,
 524                            FT_Pos*      *data )
 525   {
 526     FT_ASSERT( decoder && decoder->current_subfont );
 527
 528     *count = decoder->current_subfont->private_dict.num_family_other_blues;
 529     *data  = (FT_Pos*)
 530                &decoder->current_subfont->private_dict.family_other_blues;
 531   }
 532
 533
 534   FT_LOCAL_DEF( CF2_Int )
 535   cf2_getLanguageGroup( CFF_Decoder*  decoder )
 536   {
 537     FT_ASSERT( decoder && decoder->current_subfont );
 538
 539     return decoder->current_subfont->private_dict.language_group;
 540   }
 541
 542
 543   /* convert unbiased subroutine index to `CF2_Buffer' and */
 544   /* return 0 on success                                   */
 545   FT_LOCAL_DEF( CF2_Int )
 546   cf2_initGlobalRegionBuffer( CFF_Decoder*  decoder,
 547                               CF2_Int       subrNum,
 548                               CF2_Buffer    buf )
 549   {
 550     CF2_UInt  idx;
 551
 552
 553     FT_ASSERT( decoder );
 554
 555     FT_ZERO( buf );
 556
 557     idx = (CF2_UInt)( subrNum + decoder->globals_bias );
 558     if ( idx >= decoder->num_globals )
 559       return TRUE;     /* error */
 560
 561     FT_ASSERT( decoder->globals );
 562
 563     buf->start =
 564     buf->ptr   = decoder->globals[idx];
 565     buf->end   = decoder->globals[idx + 1];
 566
 567     return FALSE;      /* success */
 568   }
 569
 570
 571   /* convert AdobeStandardEncoding code to CF2_Buffer; */
 572   /* used for seac component                           */
 573   FT_LOCAL_DEF( FT_Error )
 574   cf2_getSeacComponent( CFF_Decoder*  decoder,
 575                         CF2_Int       code,
 576                         CF2_Buffer    buf )
 577   {
 578     CF2_Int   gid;
 579     FT_Byte*  charstring;
 580     FT_ULong  len;
 581     FT_Error  error;
 582
 583
 584     FT_ASSERT( decoder );
 585
 586     FT_ZERO( buf );
 587
 588 #ifdef FT_CONFIG_OPTION_INCREMENTAL
 589     /* Incremental fonts don't necessarily have valid charsets.        */
 590     /* They use the character code, not the glyph index, in this case. */
 591     if ( decoder->builder.face->root.internal->incremental_interface )
 592       gid = code;
 593     else
 594 #endif /* FT_CONFIG_OPTION_INCREMENTAL */
 595     {
 596       gid = cff_lookup_glyph_by_stdcharcode( decoder->cff, code );
 597       if ( gid < 0 )
 598         return FT_THROW( Invalid_Glyph_Format );
 599     }
 600
 601     error = cff_get_glyph_data( decoder->builder.face,
 602                                 (CF2_UInt)gid,
 603                                 &charstring,
 604                                 &len );
 605     /* TODO: for now, just pass the FreeType error through */
 606     if ( error )
 607       return error;
 608
 609     /* assume input has been validated */
 610     FT_ASSERT( charstring + len >= charstring );
 611
 612     buf->start = charstring;
 613     buf->end   = charstring + len;
 614     buf->ptr   = buf->start;
 615
 616     return FT_Err_Ok;
 617   }
 618
 619
 620   FT_LOCAL_DEF( void )
 621   cf2_freeSeacComponent( CFF_Decoder*  decoder,
 622                          CF2_Buffer    buf )
 623   {
 624     FT_ASSERT( decoder );
 625
 626     cff_free_glyph_data( decoder->builder.face,
 627                          (FT_Byte**)&buf->start,
 628                          (FT_ULong)( buf->end - buf->start ) );
 629   }
 630
 631
 632   FT_LOCAL_DEF( CF2_Int )
 633   cf2_initLocalRegionBuffer( CFF_Decoder*  decoder,
 634                              CF2_Int       subrNum,
 635                              CF2_Buffer    buf )
 636   {
 637     CF2_UInt  idx;
 638
 639
 640     FT_ASSERT( decoder );
 641
 642     FT_ZERO( buf );
 643
 644     idx = (CF2_UInt)( subrNum + decoder->locals_bias );
 645     if ( idx >= decoder->num_locals )
 646       return TRUE;     /* error */
 647
 648     FT_ASSERT( decoder->locals );
 649
 650     buf->start =
 651     buf->ptr   = decoder->locals[idx];
 652     buf->end   = decoder->locals[idx + 1];
 653
 654     return FALSE;      /* success */
 655   }
 656
 657
 658   FT_LOCAL_DEF( CF2_Fixed )
 659   cf2_getDefaultWidthX( CFF_Decoder*  decoder )
 660   {
 661     FT_ASSERT( decoder && decoder->current_subfont );
 662
 663     return cf2_intToFixed(
 664              decoder->current_subfont->private_dict.default_width );
 665   }
 666
 667
 668   FT_LOCAL_DEF( CF2_Fixed )
 669   cf2_getNominalWidthX( CFF_Decoder*  decoder )
 670   {
 671     FT_ASSERT( decoder && decoder->current_subfont );
 672
 673     return cf2_intToFixed(
 674              decoder->current_subfont->private_dict.nominal_width );
 675   }
 676
 677
 678   FT_LOCAL_DEF( void )
 679   cf2_outline_reset( CF2_Outline  outline )
 680   {
 681     CFF_Decoder*  decoder = outline->decoder;
 682
 683
 684     FT_ASSERT( decoder );
 685
 686     outline->root.windingMomentum = 0;
 687
 688     FT_GlyphLoader_Rewind( decoder->builder.loader );
 689   }
 690
 691
 692   FT_LOCAL_DEF( void )
 693   cf2_outline_close( CF2_Outline  outline )
 694   {
 695     CFF_Decoder*  decoder = outline->decoder;
 696
 697
 698     FT_ASSERT( decoder );
 699
 700     cff_builder_close_contour( &decoder->builder );
 701
 702     FT_GlyphLoader_Add( decoder->builder.loader );
 703   }
 704
 705
 706 /* END */