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/src/freetype/src/truetype/ttgload.c

https://bitbucket.org/cabalistic/ogredeps/
C | 2111 lines | 1358 code | 461 blank | 292 comment | 210 complexity | f5fa5e79435f791255d61acf451d5d32 MD5 | raw file

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   1/***************************************************************************/
   2/*                                                                         */
   3/*  ttgload.c                                                              */
   4/*                                                                         */
   5/*    TrueType Glyph Loader (body).                                        */
   6/*                                                                         */
   7/*  Copyright 1996-2012                                                    */
   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_CALC_H
  22#include FT_INTERNAL_STREAM_H
  23#include FT_INTERNAL_SFNT_H
  24#include FT_TRUETYPE_TAGS_H
  25#include FT_OUTLINE_H
  26
  27#include "ttgload.h"
  28#include "ttpload.h"
  29
  30#ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT
  31#include "ttgxvar.h"
  32#endif
  33
  34#include "tterrors.h"
  35
  36
  37  /*************************************************************************/
  38  /*                                                                       */
  39  /* The macro FT_COMPONENT is used in trace mode.  It is an implicit      */
  40  /* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log  */
  41  /* messages during execution.                                            */
  42  /*                                                                       */
  43#undef  FT_COMPONENT
  44#define FT_COMPONENT  trace_ttgload
  45
  46
  47  /*************************************************************************/
  48  /*                                                                       */
  49  /* Composite glyph flags.                                                */
  50  /*                                                                       */
  51#define ARGS_ARE_WORDS             0x0001
  52#define ARGS_ARE_XY_VALUES         0x0002
  53#define ROUND_XY_TO_GRID           0x0004
  54#define WE_HAVE_A_SCALE            0x0008
  55/* reserved                        0x0010 */
  56#define MORE_COMPONENTS            0x0020
  57#define WE_HAVE_AN_XY_SCALE        0x0040
  58#define WE_HAVE_A_2X2              0x0080
  59#define WE_HAVE_INSTR              0x0100
  60#define USE_MY_METRICS             0x0200
  61#define OVERLAP_COMPOUND           0x0400
  62#define SCALED_COMPONENT_OFFSET    0x0800
  63#define UNSCALED_COMPONENT_OFFSET  0x1000
  64
  65
  66  /*************************************************************************/
  67  /*                                                                       */
  68  /* Return the horizontal metrics in font units for a given glyph.        */
  69  /*                                                                       */
  70  FT_LOCAL_DEF( void )
  71  TT_Get_HMetrics( TT_Face     face,
  72                   FT_UInt     idx,
  73                   FT_Short*   lsb,
  74                   FT_UShort*  aw )
  75  {
  76    ( (SFNT_Service)face->sfnt )->get_metrics( face, 0, idx, lsb, aw );
  77
  78    FT_TRACE5(( "  advance width (font units): %d\n", *aw ));
  79    FT_TRACE5(( "  left side bearing (font units): %d\n", *lsb ));
  80  }
  81
  82
  83  /*************************************************************************/
  84  /*                                                                       */
  85  /* Return the vertical metrics in font units for a given glyph.          */
  86  /* Greg Hitchcock from Microsoft told us that if there were no `vmtx'    */
  87  /* table, typoAscender/Descender from the `OS/2' table would be used     */
  88  /* instead, and if there were no `OS/2' table, use ascender/descender    */
  89  /* from the `hhea' table.  But that is not what Microsoft's rasterizer   */
  90  /* apparently does: It uses the ppem value as the advance height, and    */
  91  /* sets the top side bearing to be zero.                                 */
  92  /*                                                                       */
  93  FT_LOCAL_DEF( void )
  94  TT_Get_VMetrics( TT_Face     face,
  95                   FT_UInt     idx,
  96                   FT_Short*   tsb,
  97                   FT_UShort*  ah )
  98  {
  99    if ( face->vertical_info )
 100      ( (SFNT_Service)face->sfnt )->get_metrics( face, 1, idx, tsb, ah );
 101
 102#if 1             /* Empirically determined, at variance with what MS said */
 103
 104    else
 105    {
 106      *tsb = 0;
 107      *ah  = face->root.units_per_EM;
 108    }
 109
 110#else      /* This is what MS said to do.  It isn't what they do, however. */
 111
 112    else if ( face->os2.version != 0xFFFFU )
 113    {
 114      *tsb = face->os2.sTypoAscender;
 115      *ah  = face->os2.sTypoAscender - face->os2.sTypoDescender;
 116    }
 117    else
 118    {
 119      *tsb = face->horizontal.Ascender;
 120      *ah  = face->horizontal.Ascender - face->horizontal.Descender;
 121    }
 122
 123#endif
 124
 125    FT_TRACE5(( "  advance height (font units): %d\n", *ah ));
 126    FT_TRACE5(( "  top side bearing (font units): %d\n", *tsb ));
 127  }
 128
 129
 130  static void
 131  tt_get_metrics( TT_Loader  loader,
 132                  FT_UInt    glyph_index )
 133  {
 134    TT_Face  face = (TT_Face)loader->face;
 135
 136    FT_Short   left_bearing = 0, top_bearing = 0;
 137    FT_UShort  advance_width = 0, advance_height = 0;
 138
 139
 140    TT_Get_HMetrics( face, glyph_index,
 141                     &left_bearing,
 142                     &advance_width );
 143    TT_Get_VMetrics( face, glyph_index,
 144                     &top_bearing,
 145                     &advance_height );
 146
 147    loader->left_bearing = left_bearing;
 148    loader->advance      = advance_width;
 149    loader->top_bearing  = top_bearing;
 150    loader->vadvance     = advance_height;
 151
 152    if ( !loader->linear_def )
 153    {
 154      loader->linear_def = 1;
 155      loader->linear     = advance_width;
 156    }
 157  }
 158
 159
 160#ifdef FT_CONFIG_OPTION_INCREMENTAL
 161
 162  static void
 163  tt_get_metrics_incr_overrides( TT_Loader  loader,
 164                                 FT_UInt    glyph_index )
 165  {
 166    TT_Face  face = (TT_Face)loader->face;
 167
 168    FT_Short   left_bearing = 0, top_bearing = 0;
 169    FT_UShort  advance_width = 0, advance_height = 0;
 170
 171
 172    /* If this is an incrementally loaded font check whether there are */
 173    /* overriding metrics for this glyph.                              */
 174    if ( face->root.internal->incremental_interface                           &&
 175         face->root.internal->incremental_interface->funcs->get_glyph_metrics )
 176    {
 177      FT_Incremental_MetricsRec  metrics;
 178      FT_Error                   error;
 179
 180
 181      metrics.bearing_x = loader->left_bearing;
 182      metrics.bearing_y = 0;
 183      metrics.advance   = loader->advance;
 184      metrics.advance_v = 0;
 185
 186      error = face->root.internal->incremental_interface->funcs->get_glyph_metrics(
 187                face->root.internal->incremental_interface->object,
 188                glyph_index, FALSE, &metrics );
 189      if ( error )
 190        goto Exit;
 191
 192      left_bearing  = (FT_Short)metrics.bearing_x;
 193      advance_width = (FT_UShort)metrics.advance;
 194
 195#if 0
 196
 197      /* GWW: Do I do the same for vertical metrics? */
 198      metrics.bearing_x = 0;
 199      metrics.bearing_y = loader->top_bearing;
 200      metrics.advance   = loader->vadvance;
 201
 202      error = face->root.internal->incremental_interface->funcs->get_glyph_metrics(
 203                face->root.internal->incremental_interface->object,
 204                glyph_index, TRUE, &metrics );
 205      if ( error )
 206        goto Exit;
 207
 208      top_bearing    = (FT_Short)metrics.bearing_y;
 209      advance_height = (FT_UShort)metrics.advance;
 210
 211#endif /* 0 */
 212
 213      loader->left_bearing = left_bearing;
 214      loader->advance      = advance_width;
 215      loader->top_bearing  = top_bearing;
 216      loader->vadvance     = advance_height;
 217
 218      if ( !loader->linear_def )
 219      {
 220        loader->linear_def = 1;
 221        loader->linear     = advance_width;
 222      }
 223    }
 224
 225  Exit:
 226    return;
 227  }
 228
 229#endif /* FT_CONFIG_OPTION_INCREMENTAL */
 230
 231
 232  /*************************************************************************/
 233  /*                                                                       */
 234  /* Translates an array of coordinates.                                   */
 235  /*                                                                       */
 236  static void
 237  translate_array( FT_UInt     n,
 238                   FT_Vector*  coords,
 239                   FT_Pos      delta_x,
 240                   FT_Pos      delta_y )
 241  {
 242    FT_UInt  k;
 243
 244
 245    if ( delta_x )
 246      for ( k = 0; k < n; k++ )
 247        coords[k].x += delta_x;
 248
 249    if ( delta_y )
 250      for ( k = 0; k < n; k++ )
 251        coords[k].y += delta_y;
 252  }
 253
 254
 255#undef  IS_HINTED
 256#define IS_HINTED( flags )  ( ( flags & FT_LOAD_NO_HINTING ) == 0 )
 257
 258
 259  /*************************************************************************/
 260  /*                                                                       */
 261  /* The following functions are used by default with TrueType fonts.      */
 262  /* However, they can be replaced by alternatives if we need to support   */
 263  /* TrueType-compressed formats (like MicroType) in the future.           */
 264  /*                                                                       */
 265  /*************************************************************************/
 266
 267  FT_CALLBACK_DEF( FT_Error )
 268  TT_Access_Glyph_Frame( TT_Loader  loader,
 269                         FT_UInt    glyph_index,
 270                         FT_ULong   offset,
 271                         FT_UInt    byte_count )
 272  {
 273    FT_Error   error;
 274    FT_Stream  stream = loader->stream;
 275
 276    /* for non-debug mode */
 277    FT_UNUSED( glyph_index );
 278
 279
 280    FT_TRACE4(( "Glyph %ld\n", glyph_index ));
 281
 282    /* the following line sets the `error' variable through macros! */
 283    if ( FT_STREAM_SEEK( offset ) || FT_FRAME_ENTER( byte_count ) )
 284      return error;
 285
 286    loader->cursor = stream->cursor;
 287    loader->limit  = stream->limit;
 288
 289    return TT_Err_Ok;
 290  }
 291
 292
 293  FT_CALLBACK_DEF( void )
 294  TT_Forget_Glyph_Frame( TT_Loader  loader )
 295  {
 296    FT_Stream  stream = loader->stream;
 297
 298
 299    FT_FRAME_EXIT();
 300  }
 301
 302
 303  FT_CALLBACK_DEF( FT_Error )
 304  TT_Load_Glyph_Header( TT_Loader  loader )
 305  {
 306    FT_Byte*  p     = loader->cursor;
 307    FT_Byte*  limit = loader->limit;
 308
 309
 310    if ( p + 10 > limit )
 311      return TT_Err_Invalid_Outline;
 312
 313    loader->n_contours = FT_NEXT_SHORT( p );
 314
 315    loader->bbox.xMin = FT_NEXT_SHORT( p );
 316    loader->bbox.yMin = FT_NEXT_SHORT( p );
 317    loader->bbox.xMax = FT_NEXT_SHORT( p );
 318    loader->bbox.yMax = FT_NEXT_SHORT( p );
 319
 320    FT_TRACE5(( "  # of contours: %d\n", loader->n_contours ));
 321    FT_TRACE5(( "  xMin: %4d  xMax: %4d\n", loader->bbox.xMin,
 322                                            loader->bbox.xMax ));
 323    FT_TRACE5(( "  yMin: %4d  yMax: %4d\n", loader->bbox.yMin,
 324                                            loader->bbox.yMax ));
 325    loader->cursor = p;
 326
 327    return TT_Err_Ok;
 328  }
 329
 330
 331  FT_CALLBACK_DEF( FT_Error )
 332  TT_Load_Simple_Glyph( TT_Loader  load )
 333  {
 334    FT_Error        error;
 335    FT_Byte*        p          = load->cursor;
 336    FT_Byte*        limit      = load->limit;
 337    FT_GlyphLoader  gloader    = load->gloader;
 338    FT_Int          n_contours = load->n_contours;
 339    FT_Outline*     outline;
 340    TT_Face         face       = (TT_Face)load->face;
 341    FT_UShort       n_ins;
 342    FT_Int          n_points;
 343
 344    FT_Byte         *flag, *flag_limit;
 345    FT_Byte         c, count;
 346    FT_Vector       *vec, *vec_limit;
 347    FT_Pos          x;
 348    FT_Short        *cont, *cont_limit, prev_cont;
 349    FT_Int          xy_size = 0;
 350
 351
 352    /* check that we can add the contours to the glyph */
 353    error = FT_GLYPHLOADER_CHECK_POINTS( gloader, 0, n_contours );
 354    if ( error )
 355      goto Fail;
 356
 357    /* reading the contours' endpoints & number of points */
 358    cont       = gloader->current.outline.contours;
 359    cont_limit = cont + n_contours;
 360
 361    /* check space for contours array + instructions count */
 362    if ( n_contours >= 0xFFF || p + ( n_contours + 1 ) * 2 > limit )
 363      goto Invalid_Outline;
 364
 365    prev_cont = FT_NEXT_SHORT( p );
 366
 367    if ( n_contours > 0 )
 368      cont[0] = prev_cont;
 369
 370    if ( prev_cont < 0 )
 371      goto Invalid_Outline;
 372
 373    for ( cont++; cont < cont_limit; cont++ )
 374    {
 375      cont[0] = FT_NEXT_SHORT( p );
 376      if ( cont[0] <= prev_cont )
 377      {
 378        /* unordered contours: this is invalid */
 379        goto Invalid_Outline;
 380      }
 381      prev_cont = cont[0];
 382    }
 383
 384    n_points = 0;
 385    if ( n_contours > 0 )
 386    {
 387      n_points = cont[-1] + 1;
 388      if ( n_points < 0 )
 389        goto Invalid_Outline;
 390    }
 391
 392    /* note that we will add four phantom points later */
 393    error = FT_GLYPHLOADER_CHECK_POINTS( gloader, n_points + 4, 0 );
 394    if ( error )
 395      goto Fail;
 396
 397    /* reading the bytecode instructions */
 398    load->glyph->control_len  = 0;
 399    load->glyph->control_data = 0;
 400
 401    if ( p + 2 > limit )
 402      goto Invalid_Outline;
 403
 404    n_ins = FT_NEXT_USHORT( p );
 405
 406    FT_TRACE5(( "  Instructions size: %u\n", n_ins ));
 407
 408    if ( n_ins > face->max_profile.maxSizeOfInstructions )
 409    {
 410      FT_TRACE0(( "TT_Load_Simple_Glyph: too many instructions (%d)\n",
 411                  n_ins ));
 412      error = TT_Err_Too_Many_Hints;
 413      goto Fail;
 414    }
 415
 416    if ( ( limit - p ) < n_ins )
 417    {
 418      FT_TRACE0(( "TT_Load_Simple_Glyph: instruction count mismatch\n" ));
 419      error = TT_Err_Too_Many_Hints;
 420      goto Fail;
 421    }
 422
 423#ifdef TT_USE_BYTECODE_INTERPRETER
 424
 425    if ( IS_HINTED( load->load_flags ) )
 426    {
 427      load->glyph->control_len  = n_ins;
 428      load->glyph->control_data = load->exec->glyphIns;
 429
 430      FT_MEM_COPY( load->exec->glyphIns, p, (FT_Long)n_ins );
 431    }
 432
 433#endif /* TT_USE_BYTECODE_INTERPRETER */
 434
 435    p += n_ins;
 436
 437    outline = &gloader->current.outline;
 438
 439    /* reading the point tags */
 440    flag       = (FT_Byte*)outline->tags;
 441    flag_limit = flag + n_points;
 442
 443    FT_ASSERT( flag != NULL );
 444
 445    while ( flag < flag_limit )
 446    {
 447      if ( p + 1 > limit )
 448        goto Invalid_Outline;
 449
 450      *flag++ = c = FT_NEXT_BYTE( p );
 451      if ( c & 8 )
 452      {
 453        if ( p + 1 > limit )
 454          goto Invalid_Outline;
 455
 456        count = FT_NEXT_BYTE( p );
 457        if ( flag + (FT_Int)count > flag_limit )
 458          goto Invalid_Outline;
 459
 460        for ( ; count > 0; count-- )
 461          *flag++ = c;
 462      }
 463    }
 464
 465    /* reading the X coordinates */
 466
 467    vec       = outline->points;
 468    vec_limit = vec + n_points;
 469    flag      = (FT_Byte*)outline->tags;
 470    x         = 0;
 471
 472    if ( p + xy_size > limit )
 473      goto Invalid_Outline;
 474
 475    for ( ; vec < vec_limit; vec++, flag++ )
 476    {
 477      FT_Pos   y = 0;
 478      FT_Byte  f = *flag;
 479
 480
 481      if ( f & 2 )
 482      {
 483        if ( p + 1 > limit )
 484          goto Invalid_Outline;
 485
 486        y = (FT_Pos)FT_NEXT_BYTE( p );
 487        if ( ( f & 16 ) == 0 )
 488          y = -y;
 489      }
 490      else if ( ( f & 16 ) == 0 )
 491      {
 492        if ( p + 2 > limit )
 493          goto Invalid_Outline;
 494
 495        y = (FT_Pos)FT_NEXT_SHORT( p );
 496      }
 497
 498      x     += y;
 499      vec->x = x;
 500      /* the cast is for stupid compilers */
 501      *flag  = (FT_Byte)( f & ~( 2 | 16 ) );
 502    }
 503
 504    /* reading the Y coordinates */
 505
 506    vec       = gloader->current.outline.points;
 507    vec_limit = vec + n_points;
 508    flag      = (FT_Byte*)outline->tags;
 509    x         = 0;
 510
 511    for ( ; vec < vec_limit; vec++, flag++ )
 512    {
 513      FT_Pos   y = 0;
 514      FT_Byte  f = *flag;
 515
 516
 517      if ( f & 4 )
 518      {
 519        if ( p + 1 > limit )
 520          goto Invalid_Outline;
 521
 522        y = (FT_Pos)FT_NEXT_BYTE( p );
 523        if ( ( f & 32 ) == 0 )
 524          y = -y;
 525      }
 526      else if ( ( f & 32 ) == 0 )
 527      {
 528        if ( p + 2 > limit )
 529          goto Invalid_Outline;
 530
 531        y = (FT_Pos)FT_NEXT_SHORT( p );
 532      }
 533
 534      x     += y;
 535      vec->y = x;
 536      /* the cast is for stupid compilers */
 537      *flag  = (FT_Byte)( f & FT_CURVE_TAG_ON );
 538    }
 539
 540    outline->n_points   = (FT_UShort)n_points;
 541    outline->n_contours = (FT_Short) n_contours;
 542
 543    load->cursor = p;
 544
 545  Fail:
 546    return error;
 547
 548  Invalid_Outline:
 549    error = TT_Err_Invalid_Outline;
 550    goto Fail;
 551  }
 552
 553
 554  FT_CALLBACK_DEF( FT_Error )
 555  TT_Load_Composite_Glyph( TT_Loader  loader )
 556  {
 557    FT_Error        error;
 558    FT_Byte*        p       = loader->cursor;
 559    FT_Byte*        limit   = loader->limit;
 560    FT_GlyphLoader  gloader = loader->gloader;
 561    FT_SubGlyph     subglyph;
 562    FT_UInt         num_subglyphs;
 563
 564
 565    num_subglyphs = 0;
 566
 567    do
 568    {
 569      FT_Fixed  xx, xy, yy, yx;
 570      FT_UInt   count;
 571
 572
 573      /* check that we can load a new subglyph */
 574      error = FT_GlyphLoader_CheckSubGlyphs( gloader, num_subglyphs + 1 );
 575      if ( error )
 576        goto Fail;
 577
 578      /* check space */
 579      if ( p + 4 > limit )
 580        goto Invalid_Composite;
 581
 582      subglyph = gloader->current.subglyphs + num_subglyphs;
 583
 584      subglyph->arg1 = subglyph->arg2 = 0;
 585
 586      subglyph->flags = FT_NEXT_USHORT( p );
 587      subglyph->index = FT_NEXT_USHORT( p );
 588
 589      /* check space */
 590      count = 2;
 591      if ( subglyph->flags & ARGS_ARE_WORDS )
 592        count += 2;
 593      if ( subglyph->flags & WE_HAVE_A_SCALE )
 594        count += 2;
 595      else if ( subglyph->flags & WE_HAVE_AN_XY_SCALE )
 596        count += 4;
 597      else if ( subglyph->flags & WE_HAVE_A_2X2 )
 598        count += 8;
 599
 600      if ( p + count > limit )
 601        goto Invalid_Composite;
 602
 603      /* read arguments */
 604      if ( subglyph->flags & ARGS_ARE_WORDS )
 605      {
 606        subglyph->arg1 = FT_NEXT_SHORT( p );
 607        subglyph->arg2 = FT_NEXT_SHORT( p );
 608      }
 609      else
 610      {
 611        subglyph->arg1 = FT_NEXT_CHAR( p );
 612        subglyph->arg2 = FT_NEXT_CHAR( p );
 613      }
 614
 615      /* read transform */
 616      xx = yy = 0x10000L;
 617      xy = yx = 0;
 618
 619      if ( subglyph->flags & WE_HAVE_A_SCALE )
 620      {
 621        xx = (FT_Fixed)FT_NEXT_SHORT( p ) << 2;
 622        yy = xx;
 623      }
 624      else if ( subglyph->flags & WE_HAVE_AN_XY_SCALE )
 625      {
 626        xx = (FT_Fixed)FT_NEXT_SHORT( p ) << 2;
 627        yy = (FT_Fixed)FT_NEXT_SHORT( p ) << 2;
 628      }
 629      else if ( subglyph->flags & WE_HAVE_A_2X2 )
 630      {
 631        xx = (FT_Fixed)FT_NEXT_SHORT( p ) << 2;
 632        yx = (FT_Fixed)FT_NEXT_SHORT( p ) << 2;
 633        xy = (FT_Fixed)FT_NEXT_SHORT( p ) << 2;
 634        yy = (FT_Fixed)FT_NEXT_SHORT( p ) << 2;
 635      }
 636
 637      subglyph->transform.xx = xx;
 638      subglyph->transform.xy = xy;
 639      subglyph->transform.yx = yx;
 640      subglyph->transform.yy = yy;
 641
 642      num_subglyphs++;
 643
 644    } while ( subglyph->flags & MORE_COMPONENTS );
 645
 646    gloader->current.num_subglyphs = num_subglyphs;
 647
 648#ifdef TT_USE_BYTECODE_INTERPRETER
 649
 650    {
 651      FT_Stream  stream = loader->stream;
 652
 653
 654      /* we must undo the FT_FRAME_ENTER in order to point */
 655      /* to the composite instructions, if we find some.   */
 656      /* We will process them later.                       */
 657      /*                                                   */
 658      loader->ins_pos = (FT_ULong)( FT_STREAM_POS() +
 659                                    p - limit );
 660    }
 661
 662#endif
 663
 664    loader->cursor = p;
 665
 666  Fail:
 667    return error;
 668
 669  Invalid_Composite:
 670    error = TT_Err_Invalid_Composite;
 671    goto Fail;
 672  }
 673
 674
 675  FT_LOCAL_DEF( void )
 676  TT_Init_Glyph_Loading( TT_Face  face )
 677  {
 678    face->access_glyph_frame   = TT_Access_Glyph_Frame;
 679    face->read_glyph_header    = TT_Load_Glyph_Header;
 680    face->read_simple_glyph    = TT_Load_Simple_Glyph;
 681    face->read_composite_glyph = TT_Load_Composite_Glyph;
 682    face->forget_glyph_frame   = TT_Forget_Glyph_Frame;
 683  }
 684
 685
 686  static void
 687  tt_prepare_zone( TT_GlyphZone  zone,
 688                   FT_GlyphLoad  load,
 689                   FT_UInt       start_point,
 690                   FT_UInt       start_contour )
 691  {
 692    zone->n_points    = (FT_UShort)( load->outline.n_points - start_point );
 693    zone->n_contours  = (FT_Short) ( load->outline.n_contours -
 694                                       start_contour );
 695    zone->org         = load->extra_points + start_point;
 696    zone->cur         = load->outline.points + start_point;
 697    zone->orus        = load->extra_points2 + start_point;
 698    zone->tags        = (FT_Byte*)load->outline.tags + start_point;
 699    zone->contours    = (FT_UShort*)load->outline.contours + start_contour;
 700    zone->first_point = (FT_UShort)start_point;
 701  }
 702
 703
 704  /*************************************************************************/
 705  /*                                                                       */
 706  /* <Function>                                                            */
 707  /*    TT_Hint_Glyph                                                      */
 708  /*                                                                       */
 709  /* <Description>                                                         */
 710  /*    Hint the glyph using the zone prepared by the caller.  Note that   */
 711  /*    the zone is supposed to include four phantom points.               */
 712  /*                                                                       */
 713  static FT_Error
 714  TT_Hint_Glyph( TT_Loader  loader,
 715                 FT_Bool    is_composite )
 716  {
 717    TT_GlyphZone  zone = &loader->zone;
 718    FT_Pos        origin;
 719
 720#ifdef TT_USE_BYTECODE_INTERPRETER
 721    FT_UInt       n_ins;
 722#else
 723    FT_UNUSED( is_composite );
 724#endif
 725
 726
 727#ifdef TT_USE_BYTECODE_INTERPRETER
 728    if ( loader->glyph->control_len > 0xFFFFL )
 729    {
 730      FT_TRACE1(( "TT_Hint_Glyph: too long instructions " ));
 731      FT_TRACE1(( "(0x%lx byte) is truncated\n",
 732                 loader->glyph->control_len ));
 733    }
 734    n_ins = (FT_UInt)( loader->glyph->control_len );
 735#endif
 736
 737    origin = zone->cur[zone->n_points - 4].x;
 738    origin = FT_PIX_ROUND( origin ) - origin;
 739    if ( origin )
 740      translate_array( zone->n_points, zone->cur, origin, 0 );
 741
 742#ifdef TT_USE_BYTECODE_INTERPRETER
 743    /* save original point position in org */
 744    if ( n_ins > 0 )
 745      FT_ARRAY_COPY( zone->org, zone->cur, zone->n_points );
 746
 747    /* Reset graphics state. */
 748    loader->exec->GS = ((TT_Size)loader->size)->GS;
 749
 750    /* XXX: UNDOCUMENTED! Hinting instructions of a composite glyph */
 751    /*      completely refer to the (already) hinted subglyphs.     */
 752    if ( is_composite )
 753    {
 754      loader->exec->metrics.x_scale = 1 << 16;
 755      loader->exec->metrics.y_scale = 1 << 16;
 756
 757      FT_ARRAY_COPY( zone->orus, zone->cur, zone->n_points );
 758    }
 759    else
 760    {
 761      loader->exec->metrics.x_scale =
 762        ((TT_Size)loader->size)->metrics.x_scale;
 763      loader->exec->metrics.y_scale =
 764        ((TT_Size)loader->size)->metrics.y_scale;
 765    }
 766#endif
 767
 768    /* round pp2 and pp4 */
 769    zone->cur[zone->n_points - 3].x =
 770      FT_PIX_ROUND( zone->cur[zone->n_points - 3].x );
 771    zone->cur[zone->n_points - 1].y =
 772      FT_PIX_ROUND( zone->cur[zone->n_points - 1].y );
 773
 774#ifdef TT_USE_BYTECODE_INTERPRETER
 775
 776    if ( n_ins > 0 )
 777    {
 778      FT_Bool   debug;
 779      FT_Error  error;
 780
 781      FT_GlyphLoader  gloader         = loader->gloader;
 782      FT_Outline      current_outline = gloader->current.outline;
 783
 784
 785      error = TT_Set_CodeRange( loader->exec, tt_coderange_glyph,
 786                                loader->exec->glyphIns, n_ins );
 787      if ( error )
 788        return error;
 789
 790      loader->exec->is_composite = is_composite;
 791      loader->exec->pts          = *zone;
 792
 793      debug = FT_BOOL( !( loader->load_flags & FT_LOAD_NO_SCALE ) &&
 794                       ((TT_Size)loader->size)->debug             );
 795
 796      error = TT_Run_Context( loader->exec, debug );
 797      if ( error && loader->exec->pedantic_hinting )
 798        return error;
 799
 800      /* store drop-out mode in bits 5-7; set bit 2 also as a marker */
 801      current_outline.tags[0] |=
 802        ( loader->exec->GS.scan_type << 5 ) | FT_CURVE_TAG_HAS_SCANMODE;
 803    }
 804
 805#endif
 806
 807    /* save glyph phantom points */
 808    if ( !loader->preserve_pps )
 809    {
 810      loader->pp1 = zone->cur[zone->n_points - 4];
 811      loader->pp2 = zone->cur[zone->n_points - 3];
 812      loader->pp3 = zone->cur[zone->n_points - 2];
 813      loader->pp4 = zone->cur[zone->n_points - 1];
 814    }
 815
 816    return TT_Err_Ok;
 817  }
 818
 819
 820  /*************************************************************************/
 821  /*                                                                       */
 822  /* <Function>                                                            */
 823  /*    TT_Process_Simple_Glyph                                            */
 824  /*                                                                       */
 825  /* <Description>                                                         */
 826  /*    Once a simple glyph has been loaded, it needs to be processed.     */
 827  /*    Usually, this means scaling and hinting through bytecode           */
 828  /*    interpretation.                                                    */
 829  /*                                                                       */
 830  static FT_Error
 831  TT_Process_Simple_Glyph( TT_Loader  loader )
 832  {
 833    FT_GlyphLoader  gloader = loader->gloader;
 834    FT_Error        error   = TT_Err_Ok;
 835    FT_Outline*     outline;
 836    FT_Int          n_points;
 837
 838
 839    outline  = &gloader->current.outline;
 840    n_points = outline->n_points;
 841
 842    /* set phantom points */
 843
 844    outline->points[n_points    ] = loader->pp1;
 845    outline->points[n_points + 1] = loader->pp2;
 846    outline->points[n_points + 2] = loader->pp3;
 847    outline->points[n_points + 3] = loader->pp4;
 848
 849    outline->tags[n_points    ] = 0;
 850    outline->tags[n_points + 1] = 0;
 851    outline->tags[n_points + 2] = 0;
 852    outline->tags[n_points + 3] = 0;
 853
 854    n_points += 4;
 855
 856#ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT
 857
 858    if ( ((TT_Face)loader->face)->doblend )
 859    {
 860      /* Deltas apply to the unscaled data. */
 861      FT_Vector*  deltas;
 862      FT_Memory   memory = loader->face->memory;
 863      FT_Int      i;
 864
 865
 866      error = TT_Vary_Get_Glyph_Deltas( (TT_Face)(loader->face),
 867                                        loader->glyph_index,
 868                                        &deltas,
 869                                        n_points );
 870      if ( error )
 871        return error;
 872
 873      for ( i = 0; i < n_points; ++i )
 874      {
 875        outline->points[i].x += deltas[i].x;
 876        outline->points[i].y += deltas[i].y;
 877      }
 878
 879      FT_FREE( deltas );
 880    }
 881
 882#endif /* TT_CONFIG_OPTION_GX_VAR_SUPPORT */
 883
 884    if ( IS_HINTED( loader->load_flags ) )
 885    {
 886      tt_prepare_zone( &loader->zone, &gloader->current, 0, 0 );
 887
 888      FT_ARRAY_COPY( loader->zone.orus, loader->zone.cur,
 889                     loader->zone.n_points + 4 );
 890    }
 891
 892    /* scale the glyph */
 893    if ( ( loader->load_flags & FT_LOAD_NO_SCALE ) == 0 )
 894    {
 895      FT_Vector*  vec     = outline->points;
 896      FT_Vector*  limit   = outline->points + n_points;
 897      FT_Fixed    x_scale = ((TT_Size)loader->size)->metrics.x_scale;
 898      FT_Fixed    y_scale = ((TT_Size)loader->size)->metrics.y_scale;
 899
 900
 901      for ( ; vec < limit; vec++ )
 902      {
 903        vec->x = FT_MulFix( vec->x, x_scale );
 904        vec->y = FT_MulFix( vec->y, y_scale );
 905      }
 906
 907      loader->pp1 = outline->points[n_points - 4];
 908      loader->pp2 = outline->points[n_points - 3];
 909      loader->pp3 = outline->points[n_points - 2];
 910      loader->pp4 = outline->points[n_points - 1];
 911    }
 912
 913    if ( IS_HINTED( loader->load_flags ) )
 914    {
 915      loader->zone.n_points += 4;
 916
 917      error = TT_Hint_Glyph( loader, 0 );
 918    }
 919
 920    return error;
 921  }
 922
 923
 924  /*************************************************************************/
 925  /*                                                                       */
 926  /* <Function>                                                            */
 927  /*    TT_Process_Composite_Component                                     */
 928  /*                                                                       */
 929  /* <Description>                                                         */
 930  /*    Once a composite component has been loaded, it needs to be         */
 931  /*    processed.  Usually, this means transforming and translating.      */
 932  /*                                                                       */
 933  static FT_Error
 934  TT_Process_Composite_Component( TT_Loader    loader,
 935                                  FT_SubGlyph  subglyph,
 936                                  FT_UInt      start_point,
 937                                  FT_UInt      num_base_points )
 938  {
 939    FT_GlyphLoader  gloader    = loader->gloader;
 940    FT_Vector*      base_vec   = gloader->base.outline.points;
 941    FT_UInt         num_points = gloader->base.outline.n_points;
 942    FT_Bool         have_scale;
 943    FT_Pos          x, y;
 944
 945
 946    have_scale = FT_BOOL( subglyph->flags & ( WE_HAVE_A_SCALE     |
 947                                              WE_HAVE_AN_XY_SCALE |
 948                                              WE_HAVE_A_2X2       ) );
 949
 950    /* perform the transform required for this subglyph */
 951    if ( have_scale )
 952    {
 953      FT_UInt  i;
 954
 955
 956      for ( i = num_base_points; i < num_points; i++ )
 957        FT_Vector_Transform( base_vec + i, &subglyph->transform );
 958    }
 959
 960    /* get offset */
 961    if ( !( subglyph->flags & ARGS_ARE_XY_VALUES ) )
 962    {
 963      FT_UInt     k = subglyph->arg1;
 964      FT_UInt     l = subglyph->arg2;
 965      FT_Vector*  p1;
 966      FT_Vector*  p2;
 967
 968
 969      /* match l-th point of the newly loaded component to the k-th point */
 970      /* of the previously loaded components.                             */
 971
 972      /* change to the point numbers used by our outline */
 973      k += start_point;
 974      l += num_base_points;
 975      if ( k >= num_base_points ||
 976           l >= num_points      )
 977        return TT_Err_Invalid_Composite;
 978
 979      p1 = gloader->base.outline.points + k;
 980      p2 = gloader->base.outline.points + l;
 981
 982      x = p1->x - p2->x;
 983      y = p1->y - p2->y;
 984    }
 985    else
 986    {
 987      x = subglyph->arg1;
 988      y = subglyph->arg2;
 989
 990      if ( !x && !y )
 991        return TT_Err_Ok;
 992
 993  /* Use a default value dependent on                                     */
 994  /* TT_CONFIG_OPTION_COMPONENT_OFFSET_SCALED.  This is useful for old TT */
 995  /* fonts which don't set the xxx_COMPONENT_OFFSET bit.                  */
 996
 997      if ( have_scale &&
 998#ifdef TT_CONFIG_OPTION_COMPONENT_OFFSET_SCALED
 999           !( subglyph->flags & UNSCALED_COMPONENT_OFFSET ) )
1000#else
1001            ( subglyph->flags & SCALED_COMPONENT_OFFSET ) )
1002#endif
1003      {
1004
1005#if 0
1006
1007  /*************************************************************************/
1008  /*                                                                       */
1009  /* This algorithm is what Apple documents.  But it doesn't work.         */
1010  /*                                                                       */
1011        int  a = subglyph->transform.xx > 0 ?  subglyph->transform.xx
1012                                            : -subglyph->transform.xx;
1013        int  b = subglyph->transform.yx > 0 ?  subglyph->transform.yx
1014                                            : -subglyph->transform.yx;
1015        int  c = subglyph->transform.xy > 0 ?  subglyph->transform.xy
1016                                            : -subglyph->transform.xy;
1017        int  d = subglyph->transform.yy > 0 ? subglyph->transform.yy
1018                                            : -subglyph->transform.yy;
1019        int  m = a > b ? a : b;
1020        int  n = c > d ? c : d;
1021
1022
1023        if ( a - b <= 33 && a - b >= -33 )
1024          m *= 2;
1025        if ( c - d <= 33 && c - d >= -33 )
1026          n *= 2;
1027        x = FT_MulFix( x, m );
1028        y = FT_MulFix( y, n );
1029
1030#else /* 0 */
1031
1032  /*************************************************************************/
1033  /*                                                                       */
1034  /* This algorithm is a guess and works much better than the above.       */
1035  /*                                                                       */
1036        FT_Fixed  mac_xscale = FT_SqrtFixed(
1037                                 (FT_Int32)FT_MulFix( subglyph->transform.xx,
1038                                                      subglyph->transform.xx ) +
1039                                 (FT_Int32)FT_MulFix( subglyph->transform.xy,
1040                                                      subglyph->transform.xy ) );
1041        FT_Fixed  mac_yscale = FT_SqrtFixed(
1042                                 (FT_Int32)FT_MulFix( subglyph->transform.yy,
1043                                                      subglyph->transform.yy ) +
1044                                 (FT_Int32)FT_MulFix( subglyph->transform.yx,
1045                                                      subglyph->transform.yx ) );
1046
1047
1048        x = FT_MulFix( x, mac_xscale );
1049        y = FT_MulFix( y, mac_yscale );
1050
1051#endif /* 0 */
1052
1053      }
1054
1055      if ( !( loader->load_flags & FT_LOAD_NO_SCALE ) )
1056      {
1057        FT_Fixed  x_scale = ((TT_Size)loader->size)->metrics.x_scale;
1058        FT_Fixed  y_scale = ((TT_Size)loader->size)->metrics.y_scale;
1059
1060
1061        x = FT_MulFix( x, x_scale );
1062        y = FT_MulFix( y, y_scale );
1063
1064        if ( subglyph->flags & ROUND_XY_TO_GRID )
1065        {
1066          x = FT_PIX_ROUND( x );
1067          y = FT_PIX_ROUND( y );
1068        }
1069      }
1070    }
1071
1072    if ( x || y )
1073      translate_array( num_points - num_base_points,
1074                       base_vec + num_base_points,
1075                       x, y );
1076
1077    return TT_Err_Ok;
1078  }
1079
1080
1081  /*************************************************************************/
1082  /*                                                                       */
1083  /* <Function>                                                            */
1084  /*    TT_Process_Composite_Glyph                                         */
1085  /*                                                                       */
1086  /* <Description>                                                         */
1087  /*    This is slightly different from TT_Process_Simple_Glyph, in that   */
1088  /*    its sole purpose is to hint the glyph.  Thus this function is      */
1089  /*    only available when bytecode interpreter is enabled.               */
1090  /*                                                                       */
1091  static FT_Error
1092  TT_Process_Composite_Glyph( TT_Loader  loader,
1093                              FT_UInt    start_point,
1094                              FT_UInt    start_contour )
1095  {
1096    FT_Error     error;
1097    FT_Outline*  outline;
1098    FT_UInt      i;
1099
1100
1101    outline = &loader->gloader->base.outline;
1102
1103    /* make room for phantom points */
1104    error = FT_GLYPHLOADER_CHECK_POINTS( loader->gloader,
1105                                         outline->n_points + 4,
1106                                         0 );
1107    if ( error )
1108      return error;
1109
1110    outline->points[outline->n_points    ] = loader->pp1;
1111    outline->points[outline->n_points + 1] = loader->pp2;
1112    outline->points[outline->n_points + 2] = loader->pp3;
1113    outline->points[outline->n_points + 3] = loader->pp4;
1114
1115    outline->tags[outline->n_points    ] = 0;
1116    outline->tags[outline->n_points + 1] = 0;
1117    outline->tags[outline->n_points + 2] = 0;
1118    outline->tags[outline->n_points + 3] = 0;
1119
1120#ifdef TT_USE_BYTECODE_INTERPRETER
1121
1122    {
1123      FT_Stream  stream = loader->stream;
1124      FT_UShort  n_ins, max_ins;
1125      FT_ULong   tmp;
1126
1127
1128      /* TT_Load_Composite_Glyph only gives us the offset of instructions */
1129      /* so we read them here                                             */
1130      if ( FT_STREAM_SEEK( loader->ins_pos ) ||
1131           FT_READ_USHORT( n_ins )           )
1132        return error;
1133
1134      FT_TRACE5(( "  Instructions size = %d\n", n_ins ));
1135
1136      /* check it */
1137      max_ins = ((TT_Face)loader->face)->max_profile.maxSizeOfInstructions;
1138      if ( n_ins > max_ins )
1139      {
1140        /* acroread ignores this field, so we only do a rough safety check */
1141        if ( (FT_Int)n_ins > loader->byte_len )
1142        {
1143          FT_TRACE1(( "TT_Process_Composite_Glyph: "
1144                      "too many instructions (%d) for glyph with length %d\n",
1145                      n_ins, loader->byte_len ));
1146          return TT_Err_Too_Many_Hints;
1147        }
1148
1149        tmp = loader->exec->glyphSize;
1150        error = Update_Max( loader->exec->memory,
1151                            &tmp,
1152                            sizeof ( FT_Byte ),
1153                            (void*)&loader->exec->glyphIns,
1154                            n_ins );
1155        loader->exec->glyphSize = (FT_UShort)tmp;
1156        if ( error )
1157          return error;
1158      }
1159      else if ( n_ins == 0 )
1160        return TT_Err_Ok;
1161
1162      if ( FT_STREAM_READ( loader->exec->glyphIns, n_ins ) )
1163        return error;
1164
1165      loader->glyph->control_data = loader->exec->glyphIns;
1166      loader->glyph->control_len  = n_ins;
1167    }
1168
1169#endif
1170
1171    tt_prepare_zone( &loader->zone, &loader->gloader->base,
1172                     start_point, start_contour );
1173
1174    /* Some points are likely touched during execution of  */
1175    /* instructions on components.  So let's untouch them. */
1176    for ( i = start_point; i < loader->zone.n_points; i++ )
1177      loader->zone.tags[i] &= ~FT_CURVE_TAG_TOUCH_BOTH;
1178
1179    loader->zone.n_points += 4;
1180
1181    return TT_Hint_Glyph( loader, 1 );
1182  }
1183
1184
1185  /* Calculate the four phantom points.                     */
1186  /* The first two stand for horizontal origin and advance. */
1187  /* The last two stand for vertical origin and advance.    */
1188#define TT_LOADER_SET_PP( loader )                                          \
1189          do {                                                              \
1190            (loader)->pp1.x = (loader)->bbox.xMin - (loader)->left_bearing; \
1191            (loader)->pp1.y = 0;                                            \
1192            (loader)->pp2.x = (loader)->pp1.x + (loader)->advance;          \
1193            (loader)->pp2.y = 0;                                            \
1194            (loader)->pp3.x = 0;                                            \
1195            (loader)->pp3.y = (loader)->top_bearing + (loader)->bbox.yMax;  \
1196            (loader)->pp4.x = 0;                                            \
1197            (loader)->pp4.y = (loader)->pp3.y - (loader)->vadvance;         \
1198          } while ( 0 )
1199
1200
1201  /*************************************************************************/
1202  /*                                                                       */
1203  /* <Function>                                                            */
1204  /*    load_truetype_glyph                                                */
1205  /*                                                                       */
1206  /* <Description>                                                         */
1207  /*    Loads a given truetype glyph.  Handles composites and uses a       */
1208  /*    TT_Loader object.                                                  */
1209  /*                                                                       */
1210  static FT_Error
1211  load_truetype_glyph( TT_Loader  loader,
1212                       FT_UInt    glyph_index,
1213                       FT_UInt    recurse_count,
1214                       FT_Bool    header_only )
1215  {
1216    FT_Error        error        = TT_Err_Ok;
1217    FT_Fixed        x_scale, y_scale;
1218    FT_ULong        offset;
1219    TT_Face         face         = (TT_Face)loader->face;
1220    FT_GlyphLoader  gloader      = loader->gloader;
1221    FT_Bool         opened_frame = 0;
1222
1223#ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT
1224    FT_Vector*      deltas       = NULL;
1225#endif
1226
1227#ifdef FT_CONFIG_OPTION_INCREMENTAL
1228    FT_StreamRec    inc_stream;
1229    FT_Data         glyph_data;
1230    FT_Bool         glyph_data_loaded = 0;
1231#endif
1232
1233
1234    /* some fonts have an incorrect value of `maxComponentDepth', */
1235    /* thus we allow depth 1 to catch the majority of them        */
1236    if ( recurse_count > 1                                   &&
1237         recurse_count > face->max_profile.maxComponentDepth )
1238    {
1239      error = TT_Err_Invalid_Composite;
1240      goto Exit;
1241    }
1242
1243    /* check glyph index */
1244    if ( glyph_index >= (FT_UInt)face->root.num_glyphs )
1245    {
1246      error = TT_Err_Invalid_Glyph_Index;
1247      goto Exit;
1248    }
1249
1250    loader->glyph_index = glyph_index;
1251
1252    if ( ( loader->load_flags & FT_LOAD_NO_SCALE ) == 0 )
1253    {
1254      x_scale = ((TT_Size)loader->size)->metrics.x_scale;
1255      y_scale = ((TT_Size)loader->size)->metrics.y_scale;
1256    }
1257    else
1258    {
1259      x_scale = 0x10000L;
1260      y_scale = 0x10000L;
1261    }
1262
1263    tt_get_metrics( loader, glyph_index );
1264
1265    /* Set `offset' to the start of the glyph relative to the start of */
1266    /* the `glyf' table, and `byte_len' to the length of the glyph in  */
1267    /* bytes.                                                          */
1268
1269#ifdef FT_CONFIG_OPTION_INCREMENTAL
1270
1271    /* If we are loading glyph data via the incremental interface, set */
1272    /* the loader stream to a memory stream reading the data returned  */
1273    /* by the interface.                                               */
1274    if ( face->root.internal->incremental_interface )
1275    {
1276      error = face->root.internal->incremental_interface->funcs->get_glyph_data(
1277                face->root.internal->incremental_interface->object,
1278                glyph_index, &glyph_data );
1279      if ( error )
1280        goto Exit;
1281
1282      glyph_data_loaded = 1;
1283      offset            = 0;
1284      loader->byte_len  = glyph_data.length;
1285
1286      FT_MEM_ZERO( &inc_stream, sizeof ( inc_stream ) );
1287      FT_Stream_OpenMemory( &inc_stream,
1288                            glyph_data.pointer, glyph_data.length );
1289
1290      loader->stream = &inc_stream;
1291    }
1292    else
1293
1294#endif /* FT_CONFIG_OPTION_INCREMENTAL */
1295
1296      offset = tt_face_get_location( face, glyph_index,
1297                                     (FT_UInt*)&loader->byte_len );
1298
1299    if ( loader->byte_len > 0 )
1300    {
1301#ifdef FT_CONFIG_OPTION_INCREMENTAL
1302      /* for the incremental interface, `glyf_offset' is always zero */
1303      if ( !loader->glyf_offset                        &&
1304           !face->root.internal->incremental_interface )
1305#else
1306      if ( !loader->glyf_offset )
1307#endif /* FT_CONFIG_OPTION_INCREMENTAL */
1308      {
1309        FT_TRACE2(( "no `glyf' table but non-zero `loca' entry\n" ));
1310        error = TT_Err_Invalid_Table;
1311        goto Exit;
1312      }
1313
1314      error = face->access_glyph_frame( loader, glyph_index,
1315                                        loader->glyf_offset + offset,
1316                                        loader->byte_len );
1317      if ( error )
1318        goto Exit;
1319
1320      opened_frame = 1;
1321
1322      /* read glyph header first */
1323      error = face->read_glyph_header( loader );
1324      if ( error || header_only )
1325        goto Exit;
1326    }
1327
1328    if ( loader->byte_len == 0 || loader->n_contours == 0 )
1329    {
1330      loader->bbox.xMin = 0;
1331      loader->bbox.xMax = 0;
1332      loader->bbox.yMin = 0;
1333      loader->bbox.yMax = 0;
1334
1335      if ( header_only )
1336        goto Exit;
1337
1338      /* must initialize points before (possibly) overriding */
1339      /* glyph metrics from the incremental interface        */
1340      TT_LOADER_SET_PP( loader );
1341
1342#ifdef FT_CONFIG_OPTION_INCREMENTAL
1343      tt_get_metrics_incr_overrides( loader, glyph_index );
1344#endif
1345
1346#ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT
1347
1348      if ( ((TT_Face)(loader->face))->doblend )
1349      {
1350        /* this must be done before scaling */
1351        FT_Memory  memory = loader->face->memory;
1352
1353
1354        error = TT_Vary_Get_Glyph_Deltas( (TT_Face)(loader->face),
1355                                          glyph_index, &deltas, 4 );
1356        if ( error )
1357          goto Exit;
1358
1359        loader->pp1.x += deltas[0].x; loader->pp1.y += deltas[0].y;
1360        loader->pp2.x += deltas[1].x; loader->pp2.y += deltas[1].y;
1361        loader->pp3.x += deltas[2].x; loader->pp3.y += deltas[2].y;
1362        loader->pp4.x += deltas[3].x; loader->pp4.y += deltas[3].y;
1363
1364        FT_FREE( deltas );
1365      }
1366
1367#endif
1368
1369      if ( ( loader->load_flags & FT_LOAD_NO_SCALE ) == 0 )
1370      {
1371        loader->pp1.x = FT_MulFix( loader->pp1.x, x_scale );
1372        loader->pp2.x = FT_MulFix( loader->pp2.x, x_scale );
1373        loader->pp3.y = FT_MulFix( loader->pp3.y, y_scale );
1374        loader->pp4.y = FT_MulFix( loader->pp4.y, y_scale );
1375      }
1376
1377      error = TT_Err_Ok;
1378      goto Exit;
1379    }
1380
1381    /* must initialize points before (possibly) overriding */
1382    /* glyph metrics from the incremental interface        */
1383    TT_LOADER_SET_PP( loader );
1384
1385#ifdef FT_CONFIG_OPTION_INCREMENTAL
1386    tt_get_metrics_incr_overrides( loader, glyph_index );
1387#endif
1388
1389    /***********************************************************************/
1390    /***********************************************************************/
1391    /***********************************************************************/
1392
1393    /* if it is a simple glyph, load it */
1394
1395    if ( loader->n_contours > 0 )
1396    {
1397      error = face->read_simple_glyph( loader );
1398      if ( error )
1399        goto Exit;
1400
1401      /* all data have been read */
1402      face->forget_glyph_frame( loader );
1403      opened_frame = 0;
1404
1405      error = TT_Process_Simple_Glyph( loader );
1406      if ( error )
1407        goto Exit;
1408
1409      FT_GlyphLoader_Add( gloader );
1410    }
1411
1412    /***********************************************************************/
1413    /***********************************************************************/
1414    /***********************************************************************/
1415
1416    /* otherwise, load a composite! */
1417    else if ( loader->n_contours == -1 )
1418    {
1419      FT_UInt   start_point;
1420      FT_UInt   start_contour;
1421      FT_ULong  ins_pos;  /* position of composite instructions, if any */
1422
1423
1424      start_point   = gloader->base.outline.n_points;
1425      start_contour = gloader->base.outline.n_contours;
1426
1427      /* for each subglyph, read composite header */
1428      error = face->read_composite_glyph( loader );
1429      if ( error )
1430        goto Exit;
1431
1432      /* store the offset of instructions */
1433      ins_pos = loader->ins_pos;
1434
1435      /* all data we need are read */
1436      face->forget_glyph_frame( loader );
1437      opened_frame = 0;
1438
1439#ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT
1440
1441      if ( face->doblend )
1442      {
1443        FT_Int       i, limit;
1444        FT_SubGlyph  subglyph;
1445        FT_Memory    memory = face->root.memory;
1446
1447
1448        /* this provides additional offsets */
1449        /* for each component's translation */
1450
1451        if ( ( error = TT_Vary_Get_Glyph_Deltas(
1452                         face,
1453                         glyph_index,
1454                         &deltas,
1455                         gloader->current.num_subglyphs + 4 )) != 0 )
1456          goto Exit;
1457
1458        subglyph = gloader->current.subglyphs + gloader->base.num_subglyphs;
1459        limit    = gloader->current.num_subglyphs;
1460
1461        for ( i = 0; i < limit; ++i, ++subglyph )
1462        {
1463          if ( subglyph->flags & ARGS_ARE_XY_VALUES )
1464          {
1465            /* XXX: overflow check for subglyph->{arg1,arg2}.   */
1466            /* deltas[i].{x,y} must be within signed 16-bit,    */
1467            /* but the restriction of summed delta is not clear */
1468            subglyph->arg1 += (FT_Int16)deltas[i].x;
1469            subglyph->arg2 += (FT_Int16)deltas[i].y;
1470          }
1471        }
1472
1473        loader->pp1.x += deltas[i + 0].x; loader->pp1.y += deltas[i + 0].y;
1474        loader->pp2.x += deltas[i + 1].x; loader->pp2.y += deltas[i + 1].y;
1475        loader->pp3.x += deltas[i + 2].x; loader->pp3.y += deltas[i + 2].y;
1476        loader->pp4.x += deltas[i + 3].x; loader->pp4.y += deltas[i + 3].y;
1477
1478        FT_FREE( deltas );
1479      }
1480
1481#endif /* TT_CONFIG_OPTION_GX_VAR_SUPPORT */
1482
1483      if ( ( loader->load_flags & FT_LOAD_NO_SCALE ) == 0 )
1484      {
1485        loader->pp1.x = FT_MulFix( loader->pp1.x, x_scale );
1486        loader->pp2.x = FT_MulFix( loader->pp2.x, x_scale );
1487        loader->pp3.y = FT_MulFix( loader->pp3.y, y_scale );
1488        loader->pp4.y = FT_MulFix( loader->pp4.y, y_scale );
1489      }
1490
1491      /* if the flag FT_LOAD_NO_RECURSE is set, we return the subglyph */
1492      /* `as is' in the glyph slot (the client application will be     */
1493      /* responsible for interpreting these data)...                   */
1494      if ( loader->load_flags & FT_LOAD_NO_RECURSE )
1495      {
1496        FT_GlyphLoader_Add( gloader );
1497        loader->glyph->format = FT_GLYPH_FORMAT_COMPOSITE;
1498
1499        goto Exit;
1500      }
1501
1502      /*********************************************************************/
1503      /*********************************************************************/
1504      /*********************************************************************/
1505
1506      {
1507        FT_UInt      n, num_base_points;
1508        FT_SubGlyph  subglyph       = 0;
1509
1510        FT_UInt      num_points     = start_point;
1511        FT_UInt      num_subglyphs  = gloader->current.num_subglyphs;
1512        FT_UInt      num_base_subgs = gloader->base.num_subglyphs;
1513
1514        FT_Stream    old_stream     = loader->stream;
1515        FT_Int       old_byte_len   = loader->byte_len;
1516
1517
1518        FT_GlyphLoader_Add( gloader );
1519
1520        /* read each subglyph independently */
1521        for ( n = 0; n < num_subglyphs; n++ )
1522        {
1523          FT_Vector  pp[4];
1524
1525
1526          /* Each time we call load_truetype_glyph in this loop, the   */
1527          /* value of `gloader.base.subglyphs' can change due to table */
1528          /* reallocations.  We thus need to recompute the subglyph    */
1529          /* pointer on each iteration.                                */
1530          subglyph = gloader->base.subglyphs + num_base_subgs + n;
1531
1532          pp[0] = loader->pp1;
1533          pp[1] = loader->pp2;
1534          pp[2] = loader->pp3;
1535          pp[3] = loader->pp4;
1536
1537          num_base_points = gloader->base.outline.n_points;
1538
1539          error = load_truetype_glyph( loader, subglyph->index,
1540                                       recurse_count + 1, FALSE );
1541          if ( error )
1542            goto Exit;
1543
1544          /* restore subglyph pointer */
1545          subglyph = gloader->base.subglyphs + num_base_subgs + n;
1546
1547          if ( !( subglyph->flags & USE_MY_METRICS ) )
1548          {
1549            loader->pp1 = pp[0];
1550            loader->pp2 = pp[1];
1551            loader->pp3 = pp[2];
1552            loader->pp4 = pp[3];
1553          }
1554
1555          num_points = gloader->

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