core/src/fxge/fx_freetype/fxft2.5.01/src/truetype/ttgload.c - Issue 815103002: Update freetype to 2.5.4.

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Issue 815103002: Update freetype to 2.5.4. (Closed) Base URL: https://pdfium.googlesource.com/pdfium.git@master

Patch Set: Adjust GYP and GN Created 6 years ago

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1 /***************************************************************************/

2 /* */

3 /* ttgload.c */

4 /* */

5 /* TrueType Glyph Loader (body). */

6 /* */

7 /* Copyright 1996-2013 */

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 "../../include/ft2build.h"

20 #include "../../include/freetype/internal/ftdebug.h"

21 #include "../../include/freetype/internal/ftcalc.h"

22 #include "../../include/freetype/internal/ftstream.h"

23 #include "../../include/freetype/internal/sfnt.h"

24 #include "../../include/freetype/tttags.h"

25 #include "../../include/freetype/ftoutln.h"

26 #include "../../include/freetype/ftttdrv.h"

27

28

29 #include "ttgload.h"

30 #include "ttpload.h"

31

32 #ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT

33 #include "ttgxvar.h"

34 #endif

35

36 #include "tterrors.h"

37 #include "ttsubpix.h"

38

39

40 /*************************************************************************/

41 /* */

42 /* The macro FT_COMPONENT is used in trace mode. It is an implicit */

43 /* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */

44 /* messages during execution. */

45 /* */

46 #undef FT_COMPONENT

47 #define FT_COMPONENT trace_ttgload

48

49

50 /*************************************************************************/

51 /* */

52 /* Composite glyph flags. */

53 /* */

54 #define ARGS_ARE_WORDS 0x0001

55 #define ARGS_ARE_XY_VALUES 0x0002

56 #define ROUND_XY_TO_GRID 0x0004

57 #define WE_HAVE_A_SCALE 0x0008

58 /* reserved 0x0010 */

59 #define MORE_COMPONENTS 0x0020

60 #define WE_HAVE_AN_XY_SCALE 0x0040

61 #define WE_HAVE_A_2X2 0x0080

62 #define WE_HAVE_INSTR 0x0100

63 #define USE_MY_METRICS 0x0200

64 #define OVERLAP_COMPOUND 0x0400

65 #define SCALED_COMPONENT_OFFSET 0x0800

66 #define UNSCALED_COMPONENT_OFFSET 0x1000

67

68

69 /*************************************************************************/

70 /* */

71 /* Return the horizontal metrics in font units for a given glyph. */

72 /* */

73 FT_LOCAL_DEF( void )

74 TT_Get_HMetrics( TT_Face face,

75 FT_UInt idx,

76 FT_Short* lsb,

77 FT_UShort* aw )

78 {

79 ( (SFNT_Service)face->sfnt )->get_metrics( face, 0, idx, lsb, aw );

80

81 FT_TRACE5(( " advance width (font units): %d\n", *aw ));

82 FT_TRACE5(( " left side bearing (font units): %d\n", *lsb ));

83 }

84

85

86 /*************************************************************************/

87 /* */

88 /* Return the vertical metrics in font units for a given glyph. */

89 /* Greg Hitchcock from Microsoft told us that if there were no `vmtx' */

90 /* table, typoAscender/Descender from the `OS/2' table would be used */

91 /* instead, and if there were no `OS/2' table, use ascender/descender */

92 /* from the `hhea' table. But that is not what Microsoft's rasterizer */

93 /* apparently does: It uses the ppem value as the advance height, and */

94 /* sets the top side bearing to be zero. */

95 /* */

96 FT_LOCAL_DEF( void )

97 TT_Get_VMetrics( TT_Face face,

98 FT_UInt idx,

99 FT_Short* tsb,

100 FT_UShort* ah )

101 {

102 if ( face->vertical_info )

103 ( (SFNT_Service)face->sfnt )->get_metrics( face, 1, idx, tsb, ah );

104

105 #if 1 /* Empirically determined, at variance with what MS said */

106

107 else

108 {

109 *tsb = 0;

110 *ah = face->root.units_per_EM;

111 }

112

113 #else /* This is what MS said to do. It isn't what they do, however. */

114

115 else if ( face->os2.version != 0xFFFFU )

116 {

117 *tsb = face->os2.sTypoAscender;

118 *ah = face->os2.sTypoAscender - face->os2.sTypoDescender;

119 }

120 else

121 {

122 *tsb = face->horizontal.Ascender;

123 *ah = face->horizontal.Ascender - face->horizontal.Descender;

124 }

125

126 #endif

127

128 FT_TRACE5(( " advance height (font units): %d\n", *ah ));

129 FT_TRACE5(( " top side bearing (font units): %d\n", *tsb ));

130 }

131

132

133 static void

134 tt_get_metrics( TT_Loader loader,

135 FT_UInt glyph_index )

136 {

137 TT_Face face = (TT_Face)loader->face;

138 #ifdef TT_CONFIG_OPTION_SUBPIXEL_HINTING

139 TT_Driver driver = (TT_Driver)FT_FACE_DRIVER( face );

140 #endif

141

142 FT_Short left_bearing = 0, top_bearing = 0;

143 FT_UShort advance_width = 0, advance_height = 0;

144

145

146 TT_Get_HMetrics( face, glyph_index,

147 &left_bearing,

148 &advance_width );

149 TT_Get_VMetrics( face, glyph_index,

150 &top_bearing,

151 &advance_height );

152

153 loader->left_bearing = left_bearing;

154 loader->advance = advance_width;

155 loader->top_bearing = top_bearing;

156 loader->vadvance = advance_height;

157

158 #ifdef TT_CONFIG_OPTION_SUBPIXEL_HINTING

159 if ( driver->interpreter_version == TT_INTERPRETER_VERSION_38 )

160 {

161 if ( loader->exec )

162 loader->exec->sph_tweak_flags = 0;

163

164 /* this may not be the right place for this, but it works */

165 if ( loader->exec && loader->exec->ignore_x_mode )

166 sph_set_tweaks( loader, glyph_index );

167 }

168 #endif /* TT_CONFIG_OPTION_SUBPIXEL_HINTING */

169

170 if ( !loader->linear_def )

171 {

172 loader->linear_def = 1;

173 loader->linear = advance_width;

174 }

175 }

176

177

178 #ifdef FT_CONFIG_OPTION_INCREMENTAL

179

180 static void

181 tt_get_metrics_incr_overrides( TT_Loader loader,

182 FT_UInt glyph_index )

183 {

184 TT_Face face = (TT_Face)loader->face;

185

186 FT_Short left_bearing = 0, top_bearing = 0;

187 FT_UShort advance_width = 0, advance_height = 0;

188

189

190 /* If this is an incrementally loaded font check whether there are */

191 /* overriding metrics for this glyph. */

192 if ( face->root.internal->incremental_interface &&

193 face->root.internal->incremental_interface->funcs->get_glyph_metrics )

194 {

195 FT_Incremental_MetricsRec metrics;

196 FT_Error error;

197

198

199 metrics.bearing_x = loader->left_bearing;

200 metrics.bearing_y = 0;

201 metrics.advance = loader->advance;

202 metrics.advance_v = 0;

203

204 error = face->root.internal->incremental_interface->funcs->get_glyph_metri cs(

205 face->root.internal->incremental_interface->object,

206 glyph_index, FALSE, &metrics );

207 if ( error )

208 goto Exit;

209

210 left_bearing = (FT_Short)metrics.bearing_x;

211 advance_width = (FT_UShort)metrics.advance;

212

213 #if 0

214

215 /* GWW: Do I do the same for vertical metrics? */

216 metrics.bearing_x = 0;

217 metrics.bearing_y = loader->top_bearing;

218 metrics.advance = loader->vadvance;

219

220 error = face->root.internal->incremental_interface->funcs->get_glyph_metri cs(

221 face->root.internal->incremental_interface->object,

222 glyph_index, TRUE, &metrics );

223 if ( error )

224 goto Exit;

225

226 top_bearing = (FT_Short)metrics.bearing_y;

227 advance_height = (FT_UShort)metrics.advance;

228

229 #endif /* 0 */

230

231 loader->left_bearing = left_bearing;

232 loader->advance = advance_width;

233 loader->top_bearing = top_bearing;

234 loader->vadvance = advance_height;

235

236 if ( !loader->linear_def )

237 {

238 loader->linear_def = 1;

239 loader->linear = advance_width;

240 }

241 }

242

243 Exit:

244 return;

245 }

246

247 #endif /* FT_CONFIG_OPTION_INCREMENTAL */

248

249

250 /*************************************************************************/

251 /* */

252 /* Translates an array of coordinates. */

253 /* */

254 static void

255 translate_array( FT_UInt n,

256 FT_Vector* coords,

257 FT_Pos delta_x,

258 FT_Pos delta_y )

259 {

260 FT_UInt k;

261

262

263 if ( delta_x )

264 for ( k = 0; k < n; k++ )

265 coords[k].x += delta_x;

266

267 if ( delta_y )

268 for ( k = 0; k < n; k++ )

269 coords[k].y += delta_y;

270 }

271

272

273 /*************************************************************************/

274 /* */

275 /* The following functions are used by default with TrueType fonts. */

276 /* However, they can be replaced by alternatives if we need to support */

277 /* TrueType-compressed formats (like MicroType) in the future. */

278 /* */

279 /*************************************************************************/

280

281 FT_CALLBACK_DEF( FT_Error )

282 TT_Access_Glyph_Frame( TT_Loader loader,

283 FT_UInt glyph_index,

284 FT_ULong offset,

285 FT_UInt byte_count )

286 {

287 FT_Error error;

288 FT_Stream stream = loader->stream;

289

290 /* for non-debug mode */

291 FT_UNUSED( glyph_index );

292

293

294 FT_TRACE4(( "Glyph %ld\n", glyph_index ));

295

296 /* the following line sets the `error' variable through macros! */

297 if ( FT_STREAM_SEEK( offset ) \|\| FT_FRAME_ENTER( byte_count ) )

298 return error;

299

300 loader->cursor = stream->cursor;

301 loader->limit = stream->limit;

302

303 return FT_Err_Ok;

304 }

305

306

307 FT_CALLBACK_DEF( void )

308 TT_Forget_Glyph_Frame( TT_Loader loader )

309 {

310 FT_Stream stream = loader->stream;

311

312

313 FT_FRAME_EXIT();

314 }

315

316

317 FT_CALLBACK_DEF( FT_Error )

318 TT_Load_Glyph_Header( TT_Loader loader )

319 {

320 FT_Byte* p = loader->cursor;

321 FT_Byte* limit = loader->limit;

322

323

324 if ( p + 10 > limit )

325 return FT_THROW( Invalid_Outline );

326

327 loader->n_contours = FT_NEXT_SHORT( p );

328

329 loader->bbox.xMin = FT_NEXT_SHORT( p );

330 loader->bbox.yMin = FT_NEXT_SHORT( p );

331 loader->bbox.xMax = FT_NEXT_SHORT( p );

332 loader->bbox.yMax = FT_NEXT_SHORT( p );

333

334 FT_TRACE5(( " # of contours: %d\n", loader->n_contours ));

335 FT_TRACE5(( " xMin: %4d xMax: %4d\n", loader->bbox.xMin,

336 loader->bbox.xMax ));

337 FT_TRACE5(( " yMin: %4d yMax: %4d\n", loader->bbox.yMin,

338 loader->bbox.yMax ));

339 loader->cursor = p;

340

341 return FT_Err_Ok;

342 }

343

344

345 FT_CALLBACK_DEF( FT_Error )

346 TT_Load_Simple_Glyph( TT_Loader load )

347 {

348 FT_Error error;

349 FT_Byte* p = load->cursor;

350 FT_Byte* limit = load->limit;

351 FT_GlyphLoader gloader = load->gloader;

352 FT_Int n_contours = load->n_contours;

353 FT_Outline* outline;

354 TT_Face face = (TT_Face)load->face;

355 FT_UShort n_ins;

356 FT_Int n_points;

357

358 FT_Byte flag, flag_limit;

359 FT_Byte c, count;

360 FT_Vector vec, vec_limit;

361 FT_Pos x;

362 FT_Short cont, cont_limit, prev_cont;

363 FT_Int xy_size = 0;

364

365

366 /* check that we can add the contours to the glyph */

367 error = FT_GLYPHLOADER_CHECK_POINTS( gloader, 0, n_contours );

368 if ( error )

369 goto Fail;

370

371 /* reading the contours' endpoints & number of points */

372 cont = gloader->current.outline.contours;

373 cont_limit = cont + n_contours;

374

375 /* check space for contours array + instructions count */

376 if ( n_contours >= 0xFFF \|\| p + ( n_contours + 1 ) * 2 > limit )

377 goto Invalid_Outline;

378

379 prev_cont = FT_NEXT_SHORT( p );

380

381 if ( n_contours > 0 )

382 cont[0] = prev_cont;

383

384 if ( prev_cont < 0 )

385 goto Invalid_Outline;

386

387 for ( cont++; cont < cont_limit; cont++ )

388 {

389 cont[0] = FT_NEXT_SHORT( p );

390 if ( cont[0] <= prev_cont )

391 {

392 /* unordered contours: this is invalid */

393 goto Invalid_Outline;

394 }

395 prev_cont = cont[0];

396 }

397

398 n_points = 0;

399 if ( n_contours > 0 )

400 {

401 n_points = cont[-1] + 1;

402 if ( n_points < 0 )

403 goto Invalid_Outline;

404 }

405

406 /* note that we will add four phantom points later */

407 error = FT_GLYPHLOADER_CHECK_POINTS( gloader, n_points + 4, 0 );

408 if ( error )

409 goto Fail;

410

411 /* reading the bytecode instructions */

412 load->glyph->control_len = 0;

413 load->glyph->control_data = 0;

414

415 if ( p + 2 > limit )

416 goto Invalid_Outline;

417

418 n_ins = FT_NEXT_USHORT( p );

419

420 FT_TRACE5(( " Instructions size: %u\n", n_ins ));

421

422 if ( n_ins > face->max_profile.maxSizeOfInstructions )

423 {

424 FT_TRACE0(( "TT_Load_Simple_Glyph: too many instructions (%d)\n",

425 n_ins ));

426 error = FT_THROW( Too_Many_Hints );

427 goto Fail;

428 }

429

430 if ( ( limit - p ) < n_ins )

431 {

432 FT_TRACE0(( "TT_Load_Simple_Glyph: instruction count mismatch\n" ));

433 error = FT_THROW( Too_Many_Hints );

434 goto Fail;

435 }

436

437 #ifdef TT_USE_BYTECODE_INTERPRETER

438

439 if ( IS_HINTED( load->load_flags ) )

440 {

441 load->glyph->control_len = n_ins;

442 load->glyph->control_data = load->exec->glyphIns;

443

444 FT_MEM_COPY( load->exec->glyphIns, p, (FT_Long)n_ins );

445 }

446

447 #endif /* TT_USE_BYTECODE_INTERPRETER */

448

449 p += n_ins;

450

451 outline = &gloader->current.outline;

452 if (outline->tags == NULL) {

453 FT_TRACE0(( "TT_Load_Simple_Glyph: Outline->tags = NULL!\n" ));

454 goto Invalid_Outline;

455 }

456

457 /* reading the point tags */

458 flag = (FT_Byte*)outline->tags;

459 flag_limit = flag + n_points;

460

461 //FT_ASSERT( flag != NULL );

462

463 while ( flag < flag_limit )

464 {

465 if ( p + 1 > limit )

466 goto Invalid_Outline;

467

468 *flag++ = c = FT_NEXT_BYTE( p );

469 if ( c & 8 )

470 {

471 if ( p + 1 > limit )

472 goto Invalid_Outline;

473

474 count = FT_NEXT_BYTE( p );

475 if ( flag + (FT_Int)count > flag_limit )

476 goto Invalid_Outline;

477

478 for ( ; count > 0; count-- )

479 *flag++ = c;

480 }

481 }

482

483 /* reading the X coordinates */

484

485 vec = outline->points;

486 vec_limit = vec + n_points;

487 flag = (FT_Byte*)outline->tags;

488 x = 0;

489

490 if ( p + xy_size > limit )

491 goto Invalid_Outline;

492

493 for ( ; vec < vec_limit; vec++, flag++ )

494 {

495 FT_Pos y = 0;

496 FT_Byte f = *flag;

497

498

499 if ( f & 2 )

500 {

501 if ( p + 1 > limit )

502 goto Invalid_Outline;

503

504 y = (FT_Pos)FT_NEXT_BYTE( p );

505 if ( ( f & 16 ) == 0 )

506 y = -y;

507 }

508 else if ( ( f & 16 ) == 0 )

509 {

510 if ( p + 2 > limit )

511 goto Invalid_Outline;

512

513 y = (FT_Pos)FT_NEXT_SHORT( p );

514 }

515

516 x += y;

517 vec->x = x;

518 /* the cast is for stupid compilers */

519 *flag = (FT_Byte)( f & ~( 2 \| 16 ) );

520 }

521

522 /* reading the Y coordinates */

523

524 vec = gloader->current.outline.points;

525 vec_limit = vec + n_points;

526 flag = (FT_Byte*)outline->tags;

527 x = 0;

528

529 for ( ; vec < vec_limit; vec++, flag++ )

530 {

531 FT_Pos y = 0;

532 FT_Byte f = *flag;

533

534

535 if ( f & 4 )

536 {

537 if ( p + 1 > limit )

538 goto Invalid_Outline;

539

540 y = (FT_Pos)FT_NEXT_BYTE( p );

541 if ( ( f & 32 ) == 0 )

542 y = -y;

543 }

544 else if ( ( f & 32 ) == 0 )

545 {

546 if ( p + 2 > limit )

547 goto Invalid_Outline;

548

549 y = (FT_Pos)FT_NEXT_SHORT( p );

550 }

551

552 x += y;

553 vec->y = x;

554 /* the cast is for stupid compilers */

555 *flag = (FT_Byte)( f & FT_CURVE_TAG_ON );

556 }

557

558 outline->n_points = (FT_UShort)n_points;

559 outline->n_contours = (FT_Short) n_contours;

560

561 load->cursor = p;

562

563 Fail:

564 return error;

565

566 Invalid_Outline:

567 error = FT_THROW( Invalid_Outline );

568 goto Fail;

569 }

570

571

572 FT_CALLBACK_DEF( FT_Error )

573 TT_Load_Composite_Glyph( TT_Loader loader )

574 {

575 FT_Error error;

576 FT_Byte* p = loader->cursor;

577 FT_Byte* limit = loader->limit;

578 FT_GlyphLoader gloader = loader->gloader;

579 FT_SubGlyph subglyph;

580 FT_UInt num_subglyphs;

581

582

583 num_subglyphs = 0;

584

585 do

586 {

587 FT_Fixed xx, xy, yy, yx;

588 FT_UInt count;

589

590

591 /* check that we can load a new subglyph */

592 error = FT_GlyphLoader_CheckSubGlyphs( gloader, num_subglyphs + 1 );

593 if ( error )

594 goto Fail;

595

596 /* check space */

597 if ( p + 4 > limit )

598 goto Invalid_Composite;

599

600 subglyph = gloader->current.subglyphs + num_subglyphs;

601

602 subglyph->arg1 = subglyph->arg2 = 0;

603

604 subglyph->flags = FT_NEXT_USHORT( p );

605 subglyph->index = FT_NEXT_USHORT( p );

606

607 /* check space */

608 count = 2;

609 if ( subglyph->flags & ARGS_ARE_WORDS )

610 count += 2;

611 if ( subglyph->flags & WE_HAVE_A_SCALE )

612 count += 2;

613 else if ( subglyph->flags & WE_HAVE_AN_XY_SCALE )

614 count += 4;

615 else if ( subglyph->flags & WE_HAVE_A_2X2 )

616 count += 8;

617

618 if ( p + count > limit )

619 goto Invalid_Composite;

620

621 /* read arguments */

622 if ( subglyph->flags & ARGS_ARE_WORDS )

623 {

624 subglyph->arg1 = FT_NEXT_SHORT( p );

625 subglyph->arg2 = FT_NEXT_SHORT( p );

626 }

627 else

628 {

629 subglyph->arg1 = FT_NEXT_CHAR( p );

630 subglyph->arg2 = FT_NEXT_CHAR( p );

631 }

632

633 /* read transform */

634 xx = yy = 0x10000L;

635 xy = yx = 0;

636

637 if ( subglyph->flags & WE_HAVE_A_SCALE )

638 {

639 xx = (FT_Fixed)FT_NEXT_SHORT( p ) << 2;

640 yy = xx;

641 }

642 else if ( subglyph->flags & WE_HAVE_AN_XY_SCALE )

643 {

644 xx = (FT_Fixed)FT_NEXT_SHORT( p ) << 2;

645 yy = (FT_Fixed)FT_NEXT_SHORT( p ) << 2;

646 }

647 else if ( subglyph->flags & WE_HAVE_A_2X2 )

648 {

649 xx = (FT_Fixed)FT_NEXT_SHORT( p ) << 2;

650 yx = (FT_Fixed)FT_NEXT_SHORT( p ) << 2;

651 xy = (FT_Fixed)FT_NEXT_SHORT( p ) << 2;

652 yy = (FT_Fixed)FT_NEXT_SHORT( p ) << 2;

653 }

654

655 subglyph->transform.xx = xx;

656 subglyph->transform.xy = xy;

657 subglyph->transform.yx = yx;

658 subglyph->transform.yy = yy;

659

660 num_subglyphs++;

661

662 } while ( subglyph->flags & MORE_COMPONENTS );

663

664 gloader->current.num_subglyphs = num_subglyphs;

665

666 #ifdef TT_USE_BYTECODE_INTERPRETER

667

668 {

669 FT_Stream stream = loader->stream;

670

671

672 /* we must undo the FT_FRAME_ENTER in order to point */

673 /* to the composite instructions, if we find some. */

674 /* We will process them later. */

675 /* */

676 loader->ins_pos = (FT_ULong)( FT_STREAM_POS() +

677 p - limit );

678 }

679

680 #endif

681

682 loader->cursor = p;

683

684 Fail:

685 return error;

686

687 Invalid_Composite:

688 error = FT_THROW( Invalid_Composite );

689 goto Fail;

690 }

691

692

693 FT_LOCAL_DEF( void )

694 TT_Init_Glyph_Loading( TT_Face face )

695 {

696 face->access_glyph_frame = TT_Access_Glyph_Frame;

697 face->read_glyph_header = TT_Load_Glyph_Header;

698 face->read_simple_glyph = TT_Load_Simple_Glyph;

699 face->read_composite_glyph = TT_Load_Composite_Glyph;

700 face->forget_glyph_frame = TT_Forget_Glyph_Frame;

701 }

702

703

704 static void

705 tt_prepare_zone( TT_GlyphZone zone,

706 FT_GlyphLoad load,

707 FT_UInt start_point,

708 FT_UInt start_contour )

709 {

710 zone->n_points = (FT_UShort)( load->outline.n_points - start_point );

711 zone->n_contours = (FT_Short) ( load->outline.n_contours -

712 start_contour );

713 zone->org = load->extra_points + start_point;

714 zone->cur = load->outline.points + start_point;

715 zone->orus = load->extra_points2 + start_point;

716 zone->tags = (FT_Byte*)load->outline.tags + start_point;

717 zone->contours = (FT_UShort*)load->outline.contours + start_contour;

718 zone->first_point = (FT_UShort)start_point;

719 }

720

721

722 /*************************************************************************/

723 /* */

724 /* <Function> */

725 /* TT_Hint_Glyph */

726 /* */

727 /* <Description> */

728 /* Hint the glyph using the zone prepared by the caller. Note that */

729 /* the zone is supposed to include four phantom points. */

730 /* */

731 static FT_Error

732 TT_Hint_Glyph( TT_Loader loader,

733 FT_Bool is_composite )

734 {

735 #ifdef TT_CONFIG_OPTION_SUBPIXEL_HINTING

736 TT_Face face = (TT_Face)loader->face;

737 TT_Driver driver = (TT_Driver)FT_FACE_DRIVER( face );

738 #endif

739

740 TT_GlyphZone zone = &loader->zone;

741 FT_Pos origin;

742

743 #ifdef TT_USE_BYTECODE_INTERPRETER

744 FT_UInt n_ins;

745 #else

746 FT_UNUSED( is_composite );

747 #endif

748

749

750 #ifdef TT_USE_BYTECODE_INTERPRETER

751 if ( loader->glyph->control_len > 0xFFFFL )

752 {

753 FT_TRACE1(( "TT_Hint_Glyph: too long instructions " ));

754 FT_TRACE1(( "(0x%lx byte) is truncated\n",

755 loader->glyph->control_len ));

756 }

757 n_ins = (FT_UInt)( loader->glyph->control_len );

758 #endif

759

760 origin = zone->cur[zone->n_points - 4].x;

761 origin = FT_PIX_ROUND( origin ) - origin;

762 if ( origin )

763 translate_array( zone->n_points, zone->cur, origin, 0 );

764

765 #ifdef TT_USE_BYTECODE_INTERPRETER

766 /* save original point position in org */

767 if ( n_ins > 0 )

768 FT_ARRAY_COPY( zone->org, zone->cur, zone->n_points );

769

770 /* Reset graphics state. */

771 loader->exec->GS = ((TT_Size)loader->size)->GS;

772

773 /* XXX: UNDOCUMENTED! Hinting instructions of a composite glyph */

774 /* completely refer to the (already) hinted subglyphs. */

775 if ( is_composite )

776 {

777 loader->exec->metrics.x_scale = 1 << 16;

778 loader->exec->metrics.y_scale = 1 << 16;

779

780 FT_ARRAY_COPY( zone->orus, zone->cur, zone->n_points );

781 }

782 else

783 {

784 loader->exec->metrics.x_scale =

785 ((TT_Size)loader->size)->metrics.x_scale;

786 loader->exec->metrics.y_scale =

787 ((TT_Size)loader->size)->metrics.y_scale;

788 }

789 #endif

790

791 /* round pp2 and pp4 */

792 zone->cur[zone->n_points - 3].x =

793 FT_PIX_ROUND( zone->cur[zone->n_points - 3].x );

794 zone->cur[zone->n_points - 1].y =

795 FT_PIX_ROUND( zone->cur[zone->n_points - 1].y );

796

797 #ifdef TT_USE_BYTECODE_INTERPRETER

798

799 if ( n_ins > 0 )

800 {

801 FT_Bool debug;

802 FT_Error error;

803

804 FT_GlyphLoader gloader = loader->gloader;

805 FT_Outline current_outline = gloader->current.outline;

806

807

808 error = TT_Set_CodeRange( loader->exec, tt_coderange_glyph,

809 loader->exec->glyphIns, n_ins );

810 if ( error )

811 return error;

812

813 loader->exec->is_composite = is_composite;

814 loader->exec->pts = *zone;

815

816 debug = FT_BOOL( !( loader->load_flags & FT_LOAD_NO_SCALE ) &&

817 ((TT_Size)loader->size)->debug );

818

819 error = TT_Run_Context( loader->exec, debug );

820 if ( error && loader->exec->pedantic_hinting )

821 return error;

822

823 /* store drop-out mode in bits 5-7; set bit 2 also as a marker */

824 current_outline.tags[0] \|=

825 ( loader->exec->GS.scan_type << 5 ) \| FT_CURVE_TAG_HAS_SCANMODE;

826 }

827

828 #endif

829

830 /* save glyph phantom points */

831 if ( !loader->preserve_pps )

832 {

833 loader->pp1 = zone->cur[zone->n_points - 4];

834 loader->pp2 = zone->cur[zone->n_points - 3];

835 loader->pp3 = zone->cur[zone->n_points - 2];

836 loader->pp4 = zone->cur[zone->n_points - 1];

837 }

838

839 #ifdef TT_CONFIG_OPTION_SUBPIXEL_HINTING

840 if ( driver->interpreter_version == TT_INTERPRETER_VERSION_38 )

841 {

842 if ( loader->exec->sph_tweak_flags & SPH_TWEAK_DEEMBOLDEN )

843 FT_Outline_EmboldenXY( &loader->gloader->current.outline, -24, 0 );

844

845 else if ( loader->exec->sph_tweak_flags & SPH_TWEAK_EMBOLDEN )

846 FT_Outline_EmboldenXY( &loader->gloader->current.outline, 24, 0 );

847 }

848 #endif /* TT_CONFIG_OPTION_SUBPIXEL_HINTING */

849

850 return FT_Err_Ok;

851 }

852

853

854 /*************************************************************************/

855 /* */

856 /* <Function> */

857 /* TT_Process_Simple_Glyph */

858 /* */

859 /* <Description> */

860 /* Once a simple glyph has been loaded, it needs to be processed. */

861 /* Usually, this means scaling and hinting through bytecode */

862 /* interpretation. */

863 /* */

864 static FT_Error

865 TT_Process_Simple_Glyph( TT_Loader loader )

866 {

867 FT_GlyphLoader gloader = loader->gloader;

868 FT_Error error = FT_Err_Ok;

869 FT_Outline* outline;

870 FT_Int n_points;

871

872

873 outline = &gloader->current.outline;

874 n_points = outline->n_points;

875

876 /* set phantom points */

877

878 outline->points[n_points ] = loader->pp1;

879 outline->points[n_points + 1] = loader->pp2;

880 outline->points[n_points + 2] = loader->pp3;

881 outline->points[n_points + 3] = loader->pp4;

882

883 outline->tags[n_points ] = 0;

884 outline->tags[n_points + 1] = 0;

885 outline->tags[n_points + 2] = 0;

886 outline->tags[n_points + 3] = 0;

887

888 n_points += 4;

889

890 #ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT

891

892 if ( ((TT_Face)loader->face)->doblend )

893 {

894 /* Deltas apply to the unscaled data. */

895 FT_Vector* deltas;

896 FT_Memory memory = loader->face->memory;

897 FT_Int i;

898

899

900 error = TT_Vary_Get_Glyph_Deltas( (TT_Face)(loader->face),

901 loader->glyph_index,

902 &deltas,

903 n_points );

904 if ( error )

905 return error;

906

907 for ( i = 0; i < n_points; ++i )

908 {

909 outline->points[i].x += deltas[i].x;

910 outline->points[i].y += deltas[i].y;

911 }

912

913 FT_FREE( deltas );

914 }

915

916 #endif /* TT_CONFIG_OPTION_GX_VAR_SUPPORT */

917

918 if ( IS_HINTED( loader->load_flags ) )

919 {

920 tt_prepare_zone( &loader->zone, &gloader->current, 0, 0 );

921

922 FT_ARRAY_COPY( loader->zone.orus, loader->zone.cur,

923 loader->zone.n_points + 4 );

924 }

925

926 {

927 #ifdef TT_CONFIG_OPTION_SUBPIXEL_HINTING

928 TT_Face face = (TT_Face)loader->face;

929 TT_Driver driver = (TT_Driver)FT_FACE_DRIVER( face );

930

931 FT_String* family = face->root.family_name;

932 FT_Int ppem = loader->size->metrics.x_ppem;

933 FT_String* style = face->root.style_name;

934 FT_Int x_scale_factor = 1000;

935 #endif

936

937 FT_Vector* vec = outline->points;

938 FT_Vector* limit = outline->points + n_points;

939

940 FT_Fixed x_scale = 0; /* pacify compiler */

941 FT_Fixed y_scale = 0;

942

943 FT_Bool do_scale = FALSE;

944

945

946 #ifdef TT_CONFIG_OPTION_SUBPIXEL_HINTING

947

948 if ( driver->interpreter_version == TT_INTERPRETER_VERSION_38 )

949 {

950 /* scale, but only if enabled and only if TT hinting is being used */

951 if ( IS_HINTED( loader->load_flags ) )

952 x_scale_factor = sph_test_tweak_x_scaling( face,

953 family,

954 ppem,

955 style,

956 loader->glyph_index );

957 /* scale the glyph */

958 if ( ( loader->load_flags & FT_LOAD_NO_SCALE ) == 0 \|\|

959 x_scale_factor != 1000 )

960 {

961 x_scale = FT_MulDiv( ((TT_Size)loader->size)->metrics.x_scale,

962 x_scale_factor, 1000 );

963 y_scale = ((TT_Size)loader->size)->metrics.y_scale;

964

965 /* compensate for any scaling by de/emboldening; */

966 /* the amount was determined via experimentation */

967 if ( x_scale_factor != 1000 && ppem > 11 )

968 FT_Outline_EmboldenXY( outline,

969 FT_MulFix( 1280 * ppem,

970 1000 - x_scale_factor ),

971 0 );

972 do_scale = TRUE;

973 }

974 }

975 else

976

977 #endif /* TT_CONFIG_OPTION_SUBPIXEL_HINTING */

978

979 {

980 /* scale the glyph */

981 if ( ( loader->load_flags & FT_LOAD_NO_SCALE ) == 0 )

982 {

983 x_scale = ((TT_Size)loader->size)->metrics.x_scale;

984 y_scale = ((TT_Size)loader->size)->metrics.y_scale;

985

986 do_scale = TRUE;

987 }

988 }

989

990 if ( do_scale )

991 {

992 for ( ; vec < limit; vec++ )

993 {

994 vec->x = FT_MulFix( vec->x, x_scale );

995 vec->y = FT_MulFix( vec->y, y_scale );

996 }

997

998 loader->pp1 = outline->points[n_points - 4];

999 loader->pp2 = outline->points[n_points - 3];

1000 loader->pp3 = outline->points[n_points - 2];

1001 loader->pp4 = outline->points[n_points - 1];

1002 }

1003 }

1004

1005 /**We Disable HINT except tricky font, seem it looks better, #Testdoc:000058 4_Open_CAC5U7WH.pdf,

1006 0000879_Image_MSFNUnattendedPDF.pdf,0005480_sample-barcodes print.pdf.

1007 */

1008

1009 if ( IS_HINTED( loader->load_flags ) && (loader->face->face_flags&FT_FACE_FL AG_TRICKY))

1010 {

1011 loader->zone.n_points += 4;

1012

1013 error = TT_Hint_Glyph( loader, 0 );

1014 }

1015

1016 return error;

1017 }

1018

1019

1020 /*************************************************************************/

1021 /* */

1022 /* <Function> */

1023 /* TT_Process_Composite_Component */

1024 /* */

1025 /* <Description> */

1026 /* Once a composite component has been loaded, it needs to be */

1027 /* processed. Usually, this means transforming and translating. */

1028 /* */

1029 static FT_Error

1030 TT_Process_Composite_Component( TT_Loader loader,

1031 FT_SubGlyph subglyph,

1032 FT_UInt start_point,

1033 FT_UInt num_base_points )

1034 {

1035 FT_GlyphLoader gloader = loader->gloader;

1036 FT_Vector* base_vec = gloader->base.outline.points;

1037 FT_UInt num_points = gloader->base.outline.n_points;

1038 FT_Bool have_scale;

1039 FT_Pos x, y;

1040

1041

1042 have_scale = FT_BOOL( subglyph->flags & ( WE_HAVE_A_SCALE \|

1043 WE_HAVE_AN_XY_SCALE \|

1044 WE_HAVE_A_2X2 ) );

1045

1046 /* perform the transform required for this subglyph */

1047 if ( have_scale )

1048 {

1049 FT_UInt i;

1050

1051

1052 for ( i = num_base_points; i < num_points; i++ )

1053 FT_Vector_Transform( base_vec + i, &subglyph->transform );

1054 }

1055

1056 /* get offset */

1057 if ( !( subglyph->flags & ARGS_ARE_XY_VALUES ) )

1058 {

1059 FT_UInt k = subglyph->arg1;

1060 FT_UInt l = subglyph->arg2;

1061 FT_Vector* p1;

1062 FT_Vector* p2;

1063

1064

1065 /* match l-th point of the newly loaded component to the k-th point */

1066 /* of the previously loaded components. */

1067

1068 /* change to the point numbers used by our outline */

1069 k += start_point;

1070 l += num_base_points;

1071 if ( k >= num_base_points \|\|

1072 l >= num_points )

1073 return FT_THROW( Invalid_Composite );

1074

1075 p1 = gloader->base.outline.points + k;

1076 p2 = gloader->base.outline.points + l;

1077

1078 x = p1->x - p2->x;

1079 y = p1->y - p2->y;

1080 }

1081 else

1082 {

1083 x = subglyph->arg1;

1084 y = subglyph->arg2;

1085

1086 if ( !x && !y )

1087 return FT_Err_Ok;

1088

1089 /* Use a default value dependent on */

1090 /* TT_CONFIG_OPTION_COMPONENT_OFFSET_SCALED. This is useful for old TT */

1091 /* fonts which don't set the xxx_COMPONENT_OFFSET bit. */

1092

1093 if ( have_scale &&

1094 #ifdef TT_CONFIG_OPTION_COMPONENT_OFFSET_SCALED

1095 !( subglyph->flags & UNSCALED_COMPONENT_OFFSET ) )

1096 #else

1097 ( subglyph->flags & SCALED_COMPONENT_OFFSET ) )

1098 #endif

1099 {

1100

1101 #if 0

1102

1103 /*************************************************************************/

1104 /* */

1105 /* This algorithm is what Apple documents. But it doesn't work. */

1106 /* */

1107 int a = subglyph->transform.xx > 0 ? subglyph->transform.xx

1108 : -subglyph->transform.xx;

1109 int b = subglyph->transform.yx > 0 ? subglyph->transform.yx

1110 : -subglyph->transform.yx;

1111 int c = subglyph->transform.xy > 0 ? subglyph->transform.xy

1112 : -subglyph->transform.xy;

1113 int d = subglyph->transform.yy > 0 ? subglyph->transform.yy

1114 : -subglyph->transform.yy;

1115 int m = a > b ? a : b;

1116 int n = c > d ? c : d;

1117

1118

1119 if ( a - b <= 33 && a - b >= -33 )

1120 m *= 2;

1121 if ( c - d <= 33 && c - d >= -33 )

1122 n *= 2;

1123 x = FT_MulFix( x, m );

1124 y = FT_MulFix( y, n );

1125

1126 #else /* 0 */

1127

1128 /*************************************************************************/

1129 /* */

1130 /* This algorithm is a guess and works much better than the above. */

1131 /* */

1132 FT_Fixed mac_xscale = FT_Hypot( subglyph->transform.xx,

1133 subglyph->transform.xy );

1134 FT_Fixed mac_yscale = FT_Hypot( subglyph->transform.yy,

1135 subglyph->transform.yx );

1136

1137

1138 x = FT_MulFix( x, mac_xscale );

1139 y = FT_MulFix( y, mac_yscale );

1140

1141 #endif /* 0 */

1142

1143 }

1144

1145 if ( !( loader->load_flags & FT_LOAD_NO_SCALE ) )

1146 {

1147 FT_Fixed x_scale = ((TT_Size)loader->size)->metrics.x_scale;

1148 FT_Fixed y_scale = ((TT_Size)loader->size)->metrics.y_scale;

1149

1150

1151 x = FT_MulFix( x, x_scale );

1152 y = FT_MulFix( y, y_scale );

1153

1154 if ( subglyph->flags & ROUND_XY_TO_GRID )

1155 {

1156 x = FT_PIX_ROUND( x );

1157 y = FT_PIX_ROUND( y );

1158 }

1159 }

1160 }

1161

1162 if ( x \|\| y )

1163 translate_array( num_points - num_base_points,

1164 base_vec + num_base_points,

1165 x, y );

1166

1167 return FT_Err_Ok;

1168 }

1169

1170

1171 /*************************************************************************/

1172 /* */

1173 /* <Function> */

1174 /* TT_Process_Composite_Glyph */

1175 /* */

1176 /* <Description> */

1177 /* This is slightly different from TT_Process_Simple_Glyph, in that */

1178 /* its sole purpose is to hint the glyph. Thus this function is */

1179 /* only available when bytecode interpreter is enabled. */

1180 /* */

1181 static FT_Error

1182 TT_Process_Composite_Glyph( TT_Loader loader,

1183 FT_UInt start_point,

1184 FT_UInt start_contour )

1185 {

1186 FT_Error error;

1187 FT_Outline* outline;

1188 FT_UInt i;

1189

1190

1191 outline = &loader->gloader->base.outline;

1192

1193 /* make room for phantom points */

1194 error = FT_GLYPHLOADER_CHECK_POINTS( loader->gloader,

1195 outline->n_points + 4,

1196 0 );

1197 if ( error )

1198 return error;

1199

1200 outline->points[outline->n_points ] = loader->pp1;

1201 outline->points[outline->n_points + 1] = loader->pp2;

1202 outline->points[outline->n_points + 2] = loader->pp3;

1203 outline->points[outline->n_points + 3] = loader->pp4;

1204

1205 outline->tags[outline->n_points ] = 0;

1206 outline->tags[outline->n_points + 1] = 0;

1207 outline->tags[outline->n_points + 2] = 0;

1208 outline->tags[outline->n_points + 3] = 0;

1209

1210 #ifdef TT_USE_BYTECODE_INTERPRETER

1211

1212 {

1213 FT_Stream stream = loader->stream;

1214 FT_UShort n_ins, max_ins;

1215 FT_ULong tmp;

1216

1217

1218 /* TT_Load_Composite_Glyph only gives us the offset of instructions */

1219 /* so we read them here */

1220 if ( FT_STREAM_SEEK( loader->ins_pos ) \|\|

1221 FT_READ_USHORT( n_ins ) )

1222 return error;

1223

1224 FT_TRACE5(( " Instructions size = %d\n", n_ins ));

1225

1226 /* check it */

1227 max_ins = ((TT_Face)loader->face)->max_profile.maxSizeOfInstructions;

1228 if ( n_ins > max_ins )

1229 {

1230 /* acroread ignores this field, so we only do a rough safety check */

1231 if ( (FT_Int)n_ins > loader->byte_len )

1232 {

1233 FT_TRACE1(( "TT_Process_Composite_Glyph: "

1234 "too many instructions (%d) for glyph with length %d\n",

1235 n_ins, loader->byte_len ));

1236 return FT_THROW( Too_Many_Hints );

1237 }

1238

1239 tmp = loader->exec->glyphSize;

1240 error = Update_Max( loader->exec->memory,

1241 &tmp,

1242 sizeof ( FT_Byte ),

1243 (void*)&loader->exec->glyphIns,

1244 n_ins );

1245 loader->exec->glyphSize = (FT_UShort)tmp;

1246 if ( error )

1247 return error;

1248 }

1249 else if ( n_ins == 0 )

1250 return FT_Err_Ok;

1251

1252 if ( FT_STREAM_READ( loader->exec->glyphIns, n_ins ) )

1253 return error;

1254

1255 loader->glyph->control_data = loader->exec->glyphIns;

1256 loader->glyph->control_len = n_ins;

1257 }

1258

1259 #endif

1260

1261 tt_prepare_zone( &loader->zone, &loader->gloader->base,

1262 start_point, start_contour );

1263

1264 /* Some points are likely touched during execution of */

1265 /* instructions on components. So let's untouch them. */

1266 for ( i = start_point; i < loader->zone.n_points; i++ )

1267 loader->zone.tags[i] &= ~FT_CURVE_TAG_TOUCH_BOTH;

1268

1269 loader->zone.n_points += 4;

1270

1271 return TT_Hint_Glyph( loader, 1 );

1272 }

1273

1274

1275 /* Calculate the four phantom points. */

1276 /* The first two stand for horizontal origin and advance. */

1277 /* The last two stand for vertical origin and advance. */

1278 #define TT_LOADER_SET_PP( loader ) \

1279 do { \

1280 (loader)->pp1.x = (loader)->bbox.xMin - (loader)->left_bearing; \

1281 (loader)->pp1.y = 0; \

1282 (loader)->pp2.x = (loader)->pp1.x + (loader)->advance; \

1283 (loader)->pp2.y = 0; \

1284 (loader)->pp3.x = 0; \

1285 (loader)->pp3.y = (loader)->top_bearing + (loader)->bbox.yMax; \

1286 (loader)->pp4.x = 0; \

1287 (loader)->pp4.y = (loader)->pp3.y - (loader)->vadvance; \

1288 } while ( 0 )

1289

1290

1291 /*************************************************************************/

1292 /* */

1293 /* <Function> */

1294 /* load_truetype_glyph */

1295 /* */

1296 /* <Description> */

1297 /* Loads a given truetype glyph. Handles composites and uses a */

1298 /* TT_Loader object. */

1299 /* */

1300 static FT_Error

1301 load_truetype_glyph( TT_Loader loader,

1302 FT_UInt glyph_index,

1303 FT_UInt recurse_count,

1304 FT_Bool header_only )

1305 {

1306 FT_Error error = FT_Err_Ok;

1307 FT_Fixed x_scale, y_scale;

1308 FT_ULong offset;

1309 TT_Face face = (TT_Face)loader->face;

1310 FT_GlyphLoader gloader = loader->gloader;

1311 FT_Bool opened_frame = 0;

1312

1313 #ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT

1314 FT_Vector* deltas = NULL;

1315 #endif

1316

1317 #ifdef FT_CONFIG_OPTION_INCREMENTAL

1318 FT_StreamRec inc_stream;

1319 FT_Data glyph_data;

1320 FT_Bool glyph_data_loaded = 0;

1321 #endif

1322

1323

1324 /* some fonts have an incorrect value of `maxComponentDepth', */

1325 /* thus we allow depth 1 to catch the majority of them */

1326 if ( recurse_count > 1 &&

1327 recurse_count > face->max_profile.maxComponentDepth )

1328 {

1329 error = FT_THROW( Invalid_Composite );

1330 goto Exit;

1331 }

1332

1333 /* check glyph index */

1334 if ( glyph_index >= (FT_UInt)face->root.num_glyphs )

1335 {

1336 error = FT_THROW( Invalid_Glyph_Index );

1337 goto Exit;

1338 }

1339

1340 loader->glyph_index = glyph_index;

1341

1342 if ( ( loader->load_flags & FT_LOAD_NO_SCALE ) == 0 )

1343 {

1344 x_scale = ((TT_Size)loader->size)->metrics.x_scale;

1345 y_scale = ((TT_Size)loader->size)->metrics.y_scale;

1346 }

1347 else

1348 {

1349 x_scale = 0x10000L;

1350 y_scale = 0x10000L;

1351 }

1352

1353 tt_get_metrics( loader, glyph_index );

1354

1355 /* Set `offset' to the start of the glyph relative to the start of */

1356 /* the `glyf' table, and `byte_len' to the length of the glyph in */

1357 /* bytes. */

1358

1359 #ifdef FT_CONFIG_OPTION_INCREMENTAL

1360

1361 /* If we are loading glyph data via the incremental interface, set */

1362 /* the loader stream to a memory stream reading the data returned */

1363 /* by the interface. */

1364 if ( face->root.internal->incremental_interface )

1365 {

1366 error = face->root.internal->incremental_interface->funcs->get_glyph_data(

1367 face->root.internal->incremental_interface->object,

1368 glyph_index, &glyph_data );

1369 if ( error )

1370 goto Exit;

1371

1372 glyph_data_loaded = 1;

1373 offset = 0;

1374 loader->byte_len = glyph_data.length;

1375

1376 FT_MEM_ZERO( &inc_stream, sizeof ( inc_stream ) );

1377 FT_Stream_OpenMemory( &inc_stream,

1378 glyph_data.pointer, glyph_data.length );

1379

1380 loader->stream = &inc_stream;

1381 }

1382 else

1383

1384 #endif /* FT_CONFIG_OPTION_INCREMENTAL */

1385

1386 offset = tt_face_get_location( face, glyph_index,

1387 (FT_UInt*)&loader->byte_len );

1388

1389 if ( loader->byte_len > 0 )

1390 {

1391 #ifdef FT_CONFIG_OPTION_INCREMENTAL

1392 /* for the incremental interface, `glyf_offset' is always zero */

1393 if ( !loader->glyf_offset &&

1394 !face->root.internal->incremental_interface )

1395 #else

1396 if ( !loader->glyf_offset )

1397 #endif /* FT_CONFIG_OPTION_INCREMENTAL */

1398 {

1399 FT_TRACE2(( "no `glyf' table but non-zero `loca' entry\n" ));

1400 error = FT_THROW( Invalid_Table );

1401 goto Exit;

1402 }

1403

1404 error = face->access_glyph_frame( loader, glyph_index,

1405 loader->glyf_offset + offset,

1406 loader->byte_len );

1407 if ( error )

1408 goto Exit;

1409

1410 opened_frame = 1;

1411

1412 /* read glyph header first */

1413 error = face->read_glyph_header( loader );

1414 if ( error \|\| header_only )

1415 goto Exit;

1416 }

1417

1418 if ( loader->byte_len == 0 \|\| loader->n_contours == 0 )

1419 {

1420 loader->bbox.xMin = 0;

1421 loader->bbox.xMax = 0;

1422 loader->bbox.yMin = 0;

1423 loader->bbox.yMax = 0;

1424

1425 if ( header_only )

1426 goto Exit;

1427

1428 /* must initialize points before (possibly) overriding */

1429 /* glyph metrics from the incremental interface */

1430 TT_LOADER_SET_PP( loader );

1431

1432 #ifdef FT_CONFIG_OPTION_INCREMENTAL

1433 tt_get_metrics_incr_overrides( loader, glyph_index );

1434 #endif

1435

1436 #ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT

1437

1438 if ( ((TT_Face)(loader->face))->doblend )

1439 {

1440 /* this must be done before scaling */

1441 FT_Memory memory = loader->face->memory;

1442

1443

1444 error = TT_Vary_Get_Glyph_Deltas( (TT_Face)(loader->face),

1445 glyph_index, &deltas, 4 );

1446 if ( error )

1447 goto Exit;

1448

1449 loader->pp1.x += deltas[0].x; loader->pp1.y += deltas[0].y;

1450 loader->pp2.x += deltas[1].x; loader->pp2.y += deltas[1].y;

1451 loader->pp3.x += deltas[2].x; loader->pp3.y += deltas[2].y;

1452 loader->pp4.x += deltas[3].x; loader->pp4.y += deltas[3].y;

1453

1454 FT_FREE( deltas );

1455 }

1456

1457 #endif

1458

1459 if ( ( loader->load_flags & FT_LOAD_NO_SCALE ) == 0 )

1460 {

1461 loader->pp1.x = FT_MulFix( loader->pp1.x, x_scale );

1462 loader->pp2.x = FT_MulFix( loader->pp2.x, x_scale );

1463 loader->pp3.y = FT_MulFix( loader->pp3.y, y_scale );

1464 loader->pp4.y = FT_MulFix( loader->pp4.y, y_scale );

1465 }

1466

1467 error = FT_Err_Ok;

1468 goto Exit;

1469 }

1470

1471 /* must initialize points before (possibly) overriding */

1472 /* glyph metrics from the incremental interface */

1473 TT_LOADER_SET_PP( loader );

1474

1475 #ifdef FT_CONFIG_OPTION_INCREMENTAL

1476 tt_get_metrics_incr_overrides( loader, glyph_index );

1477 #endif

1478

1479 /***********************************************************************/

1480 /***********************************************************************/

1481 /***********************************************************************/

1482

1483 /* if it is a simple glyph, load it */

1484

1485 if ( loader->n_contours > 0 )

1486 {

1487 error = face->read_simple_glyph( loader );

1488 if ( error )

1489 goto Exit;

1490

1491 /* all data have been read */

1492 face->forget_glyph_frame( loader );

1493 opened_frame = 0;

1494

1495 error = TT_Process_Simple_Glyph( loader );

1496 if ( error )

1497 goto Exit;

1498

1499 FT_GlyphLoader_Add( gloader );

1500 }

1501

1502 /***********************************************************************/

1503 /***********************************************************************/

1504 /***********************************************************************/

1505

1506 /* otherwise, load a composite! */

1507 else if ( loader->n_contours == -1 )

1508 {

1509 FT_UInt start_point;

1510 FT_UInt start_contour;

1511 FT_ULong ins_pos; /* position of composite instructions, if any */

1512

1513

1514 start_point = gloader->base.outline.n_points;

1515 start_contour = gloader->base.outline.n_contours;

1516

1517 /* for each subglyph, read composite header */

1518 error = face->read_composite_glyph( loader );

1519 if ( error )

1520 goto Exit;

1521

1522 /* store the offset of instructions */

1523 ins_pos = loader->ins_pos;

1524

1525 /* all data we need are read */

1526 face->forget_glyph_frame( loader );

1527 opened_frame = 0;

1528

1529 #ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT

1530

1531 if ( face->doblend )

1532 {

1533 FT_Int i, limit;

1534 FT_SubGlyph subglyph;

1535 FT_Memory memory = face->root.memory;

1536

1537

1538 /* this provides additional offsets */

1539 /* for each component's translation */

1540

1541 if ( ( error = TT_Vary_Get_Glyph_Deltas(

1542 face,

1543 glyph_index,

1544 &deltas,

1545 gloader->current.num_subglyphs + 4 )) != 0 )

1546 goto Exit;

1547

1548 subglyph = gloader->current.subglyphs + gloader->base.num_subglyphs;

1549 limit = gloader->current.num_subglyphs;

1550

1551 for ( i = 0; i < limit; ++i, ++subglyph )

1552 {

1553 if ( subglyph->flags & ARGS_ARE_XY_VALUES )

1554 {

1555 /* XXX: overflow check for subglyph->{arg1,arg2}. */

1556 /* deltas[i].{x,y} must be within signed 16-bit, */

1557 /* but the restriction of summed delta is not clear */

1558 subglyph->arg1 += (FT_Int16)deltas[i].x;

1559 subglyph->arg2 += (FT_Int16)deltas[i].y;

1560 }

1561 }

1562

1563 loader->pp1.x += deltas[i + 0].x; loader->pp1.y += deltas[i + 0].y;

1564 loader->pp2.x += deltas[i + 1].x; loader->pp2.y += deltas[i + 1].y;

1565 loader->pp3.x += deltas[i + 2].x; loader->pp3.y += deltas[i + 2].y;

1566 loader->pp4.x += deltas[i + 3].x; loader->pp4.y += deltas[i + 3].y;

1567

1568 FT_FREE( deltas );

1569 }

1570

1571 #endif /* TT_CONFIG_OPTION_GX_VAR_SUPPORT */

1572

1573 if ( ( loader->load_flags & FT_LOAD_NO_SCALE ) == 0 )

1574 {

1575 loader->pp1.x = FT_MulFix( loader->pp1.x, x_scale );

1576 loader->pp2.x = FT_MulFix( loader->pp2.x, x_scale );

1577 loader->pp3.y = FT_MulFix( loader->pp3.y, y_scale );

1578 loader->pp4.y = FT_MulFix( loader->pp4.y, y_scale );

1579 }

1580

1581 /* if the flag FT_LOAD_NO_RECURSE is set, we return the subglyph */

1582 /* `as is' in the glyph slot (the client application will be */

1583 /* responsible for interpreting these data)... */

1584 if ( loader->load_flags & FT_LOAD_NO_RECURSE )

1585 {

1586 FT_GlyphLoader_Add( gloader );

1587 loader->glyph->format = FT_GLYPH_FORMAT_COMPOSITE;

1588

1589 goto Exit;

1590 }

1591

1592 /*********************************************************************/

1593 /*********************************************************************/

1594 /*********************************************************************/

1595

1596 {

1597 FT_UInt n, num_base_points;

1598 FT_SubGlyph subglyph = 0;

1599

1600 FT_UInt num_points = start_point;

1601 FT_UInt num_subglyphs = gloader->current.num_subglyphs;

1602 FT_UInt num_base_subgs = gloader->base.num_subglyphs;

1603

1604 FT_Stream old_stream = loader->stream;

1605 FT_Int old_byte_len = loader->byte_len;

1606

1607

1608 FT_GlyphLoader_Add( gloader );

1609

1610 /* read each subglyph independently */

1611 for ( n = 0; n < num_subglyphs; n++ )

1612 {

1613 FT_Vector pp[4];

1614

1615

1616 /* Each time we call load_truetype_glyph in this loop, the */

1617 /* value of `gloader.base.subglyphs' can change due to table */

1618 /* reallocations. We thus need to recompute the subglyph */

1619 /* pointer on each iteration. */

1620 subglyph = gloader->base.subglyphs + num_base_subgs + n;

1621

1622 pp[0] = loader->pp1;

1623 pp[1] = loader->pp2;

1624 pp[2] = loader->pp3;

1625 pp[3] = loader->pp4;

1626

1627 num_base_points = gloader->base.outline.n_points;

1628

1629 error = load_truetype_glyph( loader, subglyph->index,

1630 recurse_count + 1, FALSE );

1631 if ( error )

1632 goto Exit;

1633

1634 /* restore subglyph pointer */

1635 subglyph = gloader->base.subglyphs + num_base_subgs + n;

1636

1637 if ( !( subglyph->flags & USE_MY_METRICS ) )

1638 {

1639 loader->pp1 = pp[0];

1640 loader->pp2 = pp[1];

1641 loader->pp3 = pp[2];

1642 loader->pp4 = pp[3];

1643 }

1644

1645 num_points = gloader->base.outline.n_points;

1646

1647 if ( num_points == num_base_points )

1648 continue;

1649

1650 /* gloader->base.outline consists of three parts: */

1651 /* 0 -(1)-> start_point -(2)-> num_base_points -(3)-> n_points. */

1652 /* */

1653 /* (1): exists from the beginning */

1654 /* (2): components that have been loaded so far */

1655 /* (3): the newly loaded component */

1656 TT_Process_Composite_Component( loader, subglyph, start_point,

1657 num_base_points );

1658 }

1659

1660 loader->stream = old_stream;

1661 loader->byte_len = old_byte_len;

1662

1663 /* process the glyph */

1664 loader->ins_pos = ins_pos;

1665 if ( IS_HINTED( loader->load_flags ) &&

1666

1667 #ifdef TT_USE_BYTECODE_INTERPRETER

1668

1669 subglyph->flags & WE_HAVE_INSTR &&

1670

1671 #endif

1672

1673 num_points > start_point )

1674 TT_Process_Composite_Glyph( loader, start_point, start_contour );

1675

1676 }

1677 }

1678 else

1679 {

1680 /* invalid composite count (negative but not -1) */

1681 error = FT_THROW( Invalid_Outline );

1682 goto Exit;

1683 }

1684

1685 /***********************************************************************/

1686 /***********************************************************************/

1687 /***********************************************************************/

1688

1689 Exit:

1690

1691 if ( opened_frame )

1692 face->forget_glyph_frame( loader );

1693

1694 #ifdef FT_CONFIG_OPTION_INCREMENTAL

1695

1696 if ( glyph_data_loaded )

1697 face->root.internal->incremental_interface->funcs->free_glyph_data(

1698 face->root.internal->incremental_interface->object,

1699 &glyph_data );

1700

1701 #endif

1702

1703 return error;

1704 }

1705

1706

1707 static FT_Error

1708 compute_glyph_metrics( TT_Loader loader,

1709 FT_UInt glyph_index )

1710 {

1711 TT_Face face = (TT_Face)loader->face;

1712 #ifdef TT_CONFIG_OPTION_SUBPIXEL_HINTING

1713 TT_Driver driver = (TT_Driver)FT_FACE_DRIVER( face );

1714 #endif

1715

1716 FT_BBox bbox;

1717 FT_Fixed y_scale;

1718 TT_GlyphSlot glyph = loader->glyph;

1719 TT_Size size = (TT_Size)loader->size;

1720

1721

1722 y_scale = 0x10000L;

1723 if ( ( loader->load_flags & FT_LOAD_NO_SCALE ) == 0 )

1724 y_scale = size->root.metrics.y_scale;

1725

1726 if ( glyph->format != FT_GLYPH_FORMAT_COMPOSITE )

1727 FT_Outline_Get_CBox( &glyph->outline, &bbox );

1728 else

1729 bbox = loader->bbox;

1730

1731 /* get the device-independent horizontal advance; it is scaled later */

1732 /* by the base layer. */

1733 glyph->linearHoriAdvance = loader->linear;

1734

1735 glyph->metrics.horiBearingX = bbox.xMin;

1736 glyph->metrics.horiBearingY = bbox.yMax;

1737 glyph->metrics.horiAdvance = loader->pp2.x - loader->pp1.x;

1738

1739 /* adjust advance width to the value contained in the hdmx table */

1740 if ( !face->postscript.isFixedPitch &&

1741 IS_HINTED( loader->load_flags ) )

1742 {

1743 FT_Byte* widthp;

1744

1745

1746 widthp = tt_face_get_device_metrics( face,

1747 size->root.metrics.x_ppem,

1748 glyph_index );

1749

1750 #ifdef TT_CONFIG_OPTION_SUBPIXEL_HINTING

1751

1752 if ( driver->interpreter_version == TT_INTERPRETER_VERSION_38 )

1753 {

1754 FT_Bool ignore_x_mode;

1755

1756

1757 ignore_x_mode = FT_BOOL( FT_LOAD_TARGET_MODE( loader->load_flags ) !=

1758 FT_RENDER_MODE_MONO );

1759

1760 if ( widthp &&

1761 ( ( ignore_x_mode && loader->exec->compatible_widths ) \|\|

1762 !ignore_x_mode \|\|

1763 SPH_OPTION_BITMAP_WIDTHS ) )

1764 glyph->metrics.horiAdvance = *widthp << 6;

1765 }

1766 else

1767

1768 #endif /* TT_CONFIG_OPTION_SUBPIXEL_HINTING */

1769

1770 {

1771 if ( widthp )

1772 glyph->metrics.horiAdvance = *widthp << 6;

1773 }

1774 }

1775

1776 /* set glyph dimensions */

1777 glyph->metrics.width = bbox.xMax - bbox.xMin;

1778 glyph->metrics.height = bbox.yMax - bbox.yMin;

1779

1780 /* Now take care of vertical metrics. In the case where there is */

1781 /* no vertical information within the font (relatively common), */

1782 /* create some metrics manually */

1783 {

1784 FT_Pos top; /* scaled vertical top side bearing */

1785 FT_Pos advance; /* scaled vertical advance height */

1786

1787

1788 /* Get the unscaled top bearing and advance height. */

1789 if ( face->vertical_info &&

1790 face->vertical.number_Of_VMetrics > 0 )

1791 {

1792 top = (FT_Short)FT_DivFix( loader->pp3.y - bbox.yMax,

1793 y_scale );

1794

1795 if ( loader->pp3.y <= loader->pp4.y )

1796 advance = 0;

1797 else

1798 advance = (FT_UShort)FT_DivFix( loader->pp3.y - loader->pp4.y,

1799 y_scale );

1800 }

1801 else

1802 {

1803 FT_Pos height;

1804

1805

1806 /* XXX Compute top side bearing and advance height in */

1807 /* Get_VMetrics instead of here. */

1808

1809 /* NOTE: The OS/2 values are the only `portable' ones, */

1810 /* which is why we use them, if there is an OS/2 */

1811 /* table in the font. Otherwise, we use the */

1812 /* values defined in the horizontal header. */

1813

1814 height = (FT_Short)FT_DivFix( bbox.yMax - bbox.yMin,

1815 y_scale );

1816 if ( face->os2.version != 0xFFFFU )

1817 advance = (FT_Pos)( face->os2.sTypoAscender -

1818 face->os2.sTypoDescender );

1819 else

1820 advance = (FT_Pos)( face->horizontal.Ascender -

1821 face->horizontal.Descender );

1822

1823 top = ( advance - height ) / 2;

1824 }

1825

1826 #ifdef FT_CONFIG_OPTION_INCREMENTAL

1827 {

1828 FT_Incremental_InterfaceRec* incr;

1829 FT_Incremental_MetricsRec metrics;

1830 FT_Error error;

1831

1832

1833 incr = face->root.internal->incremental_interface;

1834

1835 /* If this is an incrementally loaded font see if there are */

1836 /* overriding metrics for this glyph. */

1837 if ( incr && incr->funcs->get_glyph_metrics )

1838 {

1839 metrics.bearing_x = 0;

1840 metrics.bearing_y = top;

1841 metrics.advance = advance;

1842

1843 error = incr->funcs->get_glyph_metrics( incr->object,

1844 glyph_index,

1845 TRUE,

1846 &metrics );

1847 if ( error )

1848 return error;

1849

1850 top = metrics.bearing_y;

1851 advance = metrics.advance;

1852 }

1853 }

1854

1855 /* GWW: Do vertical metrics get loaded incrementally too? */

1856

1857 #endif /* FT_CONFIG_OPTION_INCREMENTAL */

1858

1859 glyph->linearVertAdvance = advance;

1860

1861 /* scale the metrics */

1862 if ( !( loader->load_flags & FT_LOAD_NO_SCALE ) )

1863 {

1864 top = FT_MulFix( top, y_scale );

1865 advance = FT_MulFix( advance, y_scale );

1866 }

1867

1868 /* XXX: for now, we have no better algorithm for the lsb, but it */

1869 /* should work fine. */

1870 /* */

1871 glyph->metrics.vertBearingX = glyph->metrics.horiBearingX -

1872 glyph->metrics.horiAdvance / 2;

1873 glyph->metrics.vertBearingY = top;

1874 glyph->metrics.vertAdvance = advance;

1875 }

1876

1877 return 0;

1878 }

1879

1880

1881 #ifdef TT_CONFIG_OPTION_EMBEDDED_BITMAPS

1882

1883 static FT_Error

1884 load_sbit_image( TT_Size size,

1885 TT_GlyphSlot glyph,

1886 FT_UInt glyph_index,

1887 FT_Int32 load_flags )

1888 {

1889 TT_Face face;

1890 SFNT_Service sfnt;

1891 FT_Stream stream;

1892 FT_Error error;

1893 TT_SBit_MetricsRec metrics;

1894

1895

1896 face = (TT_Face)glyph->face;

1897 sfnt = (SFNT_Service)face->sfnt;

1898 stream = face->root.stream;

1899

1900 error = sfnt->load_sbit_image( face,

1901 size->strike_index,

1902 glyph_index,

1903 (FT_Int)load_flags,

1904 stream,

1905 &glyph->bitmap,

1906 &metrics );

1907 if ( !error )

1908 {

1909 glyph->outline.n_points = 0;

1910 glyph->outline.n_contours = 0;

1911

1912 glyph->metrics.width = (FT_Pos)metrics.width << 6;

1913 glyph->metrics.height = (FT_Pos)metrics.height << 6;

1914

1915 glyph->metrics.horiBearingX = (FT_Pos)metrics.horiBearingX << 6;

1916 glyph->metrics.horiBearingY = (FT_Pos)metrics.horiBearingY << 6;

1917 glyph->metrics.horiAdvance = (FT_Pos)metrics.horiAdvance << 6;

1918

1919 glyph->metrics.vertBearingX = (FT_Pos)metrics.vertBearingX << 6;

1920 glyph->metrics.vertBearingY = (FT_Pos)metrics.vertBearingY << 6;

1921 glyph->metrics.vertAdvance = (FT_Pos)metrics.vertAdvance << 6;

1922

1923 glyph->format = FT_GLYPH_FORMAT_BITMAP;

1924

1925 if ( load_flags & FT_LOAD_VERTICAL_LAYOUT )

1926 {

1927 glyph->bitmap_left = metrics.vertBearingX;

1928 glyph->bitmap_top = metrics.vertBearingY;

1929 }

1930 else

1931 {

1932 glyph->bitmap_left = metrics.horiBearingX;

1933 glyph->bitmap_top = metrics.horiBearingY;

1934 }

1935 }

1936

1937 return error;

1938 }

1939

1940 #endif /* TT_CONFIG_OPTION_EMBEDDED_BITMAPS */

1941

1942

1943 static FT_Error

1944 tt_loader_init( TT_Loader loader,

1945 TT_Size size,

1946 TT_GlyphSlot glyph,

1947 FT_Int32 load_flags,

1948 FT_Bool glyf_table_only )

1949 {

1950 TT_Face face;

1951 FT_Stream stream;

1952 #ifdef TT_USE_BYTECODE_INTERPRETER

1953 FT_Bool pedantic = FT_BOOL( load_flags & FT_LOAD_PEDANTIC );

1954 #endif

1955

1956

1957 face = (TT_Face)glyph->face;

1958 stream = face->root.stream;

1959

1960 FT_MEM_ZERO( loader, sizeof ( TT_LoaderRec ) );

1961

1962 #ifdef TT_USE_BYTECODE_INTERPRETER

1963

1964 /* load execution context */

1965 if ( IS_HINTED( load_flags ) && !glyf_table_only )

1966 {

1967 TT_ExecContext exec;

1968 FT_Bool grayscale;

1969

1970 #ifdef TT_CONFIG_OPTION_SUBPIXEL_HINTING

1971 TT_Driver driver = (TT_Driver)FT_FACE_DRIVER( face );

1972

1973 FT_Bool subpixel_hinting = FALSE;

1974 FT_Bool grayscale_hinting = TRUE;

1975

1976 #if 0

1977 /* not used yet */

1978 FT_Bool compatible_widths;

1979 FT_Bool symmetrical_smoothing;

1980 FT_Bool bgr;

1981 FT_Bool subpixel_positioned;

1982 #endif

1983 #endif /* TT_CONFIG_OPTION_SUBPIXEL_HINTING */

1984

1985 FT_Bool reexecute = FALSE;

1986

1987

1988 if ( !size->cvt_ready )

1989 {

1990 FT_Error error = tt_size_ready_bytecode( size, pedantic );

1991

1992

1993 if ( error )

1994 return error;

1995 }

1996

1997 /* query new execution context */

1998 exec = size->debug ? size->context

1999 : ( (TT_Driver)FT_FACE_DRIVER( face ) )->context;

2000 if ( !exec )

2001 return FT_THROW( Could_Not_Find_Context );

2002

2003 #ifdef TT_CONFIG_OPTION_SUBPIXEL_HINTING

2004

2005 if ( driver->interpreter_version == TT_INTERPRETER_VERSION_38 )

2006 {

2007 subpixel_hinting = FT_BOOL( ( FT_LOAD_TARGET_MODE( load_flags )

2008 != FT_RENDER_MODE_MONO ) &&

2009 SPH_OPTION_SET_SUBPIXEL );

2010

2011 if ( subpixel_hinting )

2012 grayscale = grayscale_hinting = FALSE;

2013 else if ( SPH_OPTION_SET_GRAYSCALE )

2014 {

2015 grayscale = grayscale_hinting = TRUE;

2016 subpixel_hinting = FALSE;

2017 }

2018 else

2019 grayscale = grayscale_hinting = FALSE;

2020

2021 if ( FT_IS_TRICKY( glyph->face ) )

2022 subpixel_hinting = grayscale_hinting = FALSE;

2023

2024 exec->ignore_x_mode = subpixel_hinting \|\| grayscale_hinting;

2025 exec->rasterizer_version = SPH_OPTION_SET_RASTERIZER_VERSION;

2026 if ( exec->sph_tweak_flags & SPH_TWEAK_RASTERIZER_35 )

2027 exec->rasterizer_version = TT_INTERPRETER_VERSION_35;

2028

2029 #if 1

2030 exec->compatible_widths = SPH_OPTION_SET_COMPATIBLE_WIDTHS;

2031 exec->symmetrical_smoothing = FALSE;

2032 exec->bgr = FALSE;

2033 exec->subpixel_positioned = TRUE;

2034 #else /* 0 */

2035 exec->compatible_widths =

2036 FT_BOOL( FT_LOAD_TARGET_MODE( load_flags ) !=

2037 TT_LOAD_COMPATIBLE_WIDTHS );

2038 exec->symmetrical_smoothing =

2039 FT_BOOL( FT_LOAD_TARGET_MODE( load_flags ) !=

2040 TT_LOAD_SYMMETRICAL_SMOOTHING );

2041 exec->bgr =

2042 FT_BOOL( FT_LOAD_TARGET_MODE( load_flags ) !=

2043 TT_LOAD_BGR );

2044 exec->subpixel_positioned =

2045 FT_BOOL( FT_LOAD_TARGET_MODE( load_flags ) !=

2046 TT_LOAD_SUBPIXEL_POSITIONED );

2047 #endif /* 0 */

2048

2049 }

2050 else

2051

2052 #endif /* TT_CONFIG_OPTION_SUBPIXEL_HINTING */

2053

2054 {

2055 grayscale = FT_BOOL( FT_LOAD_TARGET_MODE( load_flags ) !=

2056 FT_RENDER_MODE_MONO );

2057 }

2058

2059 TT_Load_Context( exec, face, size );

2060

2061 #ifdef TT_CONFIG_OPTION_SUBPIXEL_HINTING

2062

2063 if ( driver->interpreter_version == TT_INTERPRETER_VERSION_38 )

2064 {

2065 /* a change from mono to subpixel rendering (and vice versa) */

2066 /* requires a re-execution of the CVT program */

2067 if ( subpixel_hinting != exec->subpixel_hinting )

2068 {

2069 FT_TRACE4(( "tt_loader_init: subpixel hinting change,"

2070 " re-executing `prep' table\n" ));

2071

2072 exec->subpixel_hinting = subpixel_hinting;

2073 reexecute = TRUE;

2074 }

2075

2076 /* a change from mono to grayscale rendering (and vice versa) */

2077 /* requires a re-execution of the CVT program */

2078 if ( grayscale != exec->grayscale_hinting )

2079 {

2080 FT_TRACE4(( "tt_loader_init: grayscale hinting change,"

2081 " re-executing `prep' table\n" ));

2082

2083 exec->grayscale_hinting = grayscale_hinting;

2084 reexecute = TRUE;

2085 }

2086 }

2087 else

2088

2089 #endif /* TT_CONFIG_OPTION_SUBPIXEL_HINTING */

2090

2091 {

2092 /* a change from mono to grayscale rendering (and vice versa) */

2093 /* requires a re-execution of the CVT program */

2094 if ( grayscale != exec->grayscale )

2095 {

2096 FT_TRACE4(( "tt_loader_init: grayscale change,"

2097 " re-executing `prep' table\n" ));

2098

2099 exec->grayscale = grayscale;

2100 reexecute = TRUE;

2101 }

2102 }

2103

2104 if ( reexecute )

2105 {

2106 FT_UInt i;

2107

2108

2109 for ( i = 0; i < size->cvt_size; i++ )

2110 size->cvt[i] = FT_MulFix( face->cvt[i], size->ttmetrics.scale );

2111 tt_size_run_prep( size, pedantic );

2112 }

2113

2114 /* see whether the cvt program has disabled hinting */

2115 if ( exec->GS.instruct_control & 1 )

2116 load_flags \|= FT_LOAD_NO_HINTING;

2117

2118 /* load default graphics state -- if needed */

2119 if ( exec->GS.instruct_control & 2 )

2120 exec->GS = tt_default_graphics_state;

2121

2122 exec->pedantic_hinting = FT_BOOL( load_flags & FT_LOAD_PEDANTIC );

2123 loader->exec = exec;

2124 loader->instructions = exec->glyphIns;

2125 }

2126

2127 #endif /* TT_USE_BYTECODE_INTERPRETER */

2128

2129 /* seek to the beginning of the glyph table -- for Type 42 fonts */

2130 /* the table might be accessed from a Postscript stream or something */

2131 /* else... */

2132

2133 #ifdef FT_CONFIG_OPTION_INCREMENTAL

2134

2135 if ( face->root.internal->incremental_interface )

2136 loader->glyf_offset = 0;

2137 else

2138

2139 #endif

2140

2141 {

2142 FT_Error error = face->goto_table( face, TTAG_glyf, stream, 0 );

2143

2144

2145 if ( FT_ERR_EQ( error, Table_Missing ) )

2146 loader->glyf_offset = 0;

2147 else if ( error )

2148 {

2149 FT_ERROR(( "tt_loader_init: could not access glyph table\n" ));

2150 return error;

2151 }

2152 else

2153 loader->glyf_offset = FT_STREAM_POS();

2154 }

2155

2156 /* get face's glyph loader */

2157 if ( !glyf_table_only )

2158 {

2159 FT_GlyphLoader gloader = glyph->internal->loader;

2160

2161

2162 FT_GlyphLoader_Rewind( gloader );

2163 loader->gloader = gloader;

2164 }

2165

2166 loader->load_flags = load_flags;

2167

2168 loader->face = (FT_Face)face;

2169 loader->size = (FT_Size)size;

2170 loader->glyph = (FT_GlyphSlot)glyph;

2171 loader->stream = stream;

2172

2173 return FT_Err_Ok;

2174 }

2175

2176

2177 /*************************************************************************/

2178 /* */

2179 /* <Function> */

2180 /* TT_Load_Glyph */

2181 /* */

2182 /* <Description> */

2183 /* A function used to load a single glyph within a given glyph slot, */

2184 /* for a given size. */

2185 /* */

2186 /* <Input> */

2187 /* glyph :: A handle to a target slot object where the glyph */

2188 /* will be loaded. */

2189 /* */

2190 /* size :: A handle to the source face size at which the glyph */

2191 /* must be scaled/loaded. */

2192 /* */

2193 /* glyph_index :: The index of the glyph in the font file. */

2194 /* */

2195 /* load_flags :: A flag indicating what to load for this glyph. The */

2196 /* FT_LOAD_XXX constants can be used to control the */

2197 /* glyph loading process (e.g., whether the outline */

2198 /* should be scaled, whether to load bitmaps or not, */

2199 /* whether to hint the outline, etc). */

2200 /* */

2201 /* <Return> */

2202 /* FreeType error code. 0 means success. */

2203 /* */

2204 FT_LOCAL_DEF( FT_Error )

2205 TT_Load_Glyph( TT_Size size,

2206 TT_GlyphSlot glyph,

2207 FT_UInt glyph_index,

2208 FT_Int32 load_flags )

2209 {

2210 FT_Error error;

2211 TT_LoaderRec loader;

2212

2213

2214 error = FT_Err_Ok;

2215

2216 #ifdef TT_CONFIG_OPTION_EMBEDDED_BITMAPS

2217

2218 /* try to load embedded bitmap if any */

2219 /* */

2220 /* XXX: The convention should be emphasized in */

2221 /* the documents because it can be confusing. */

2222 if ( size->strike_index != 0xFFFFFFFFUL &&

2223 ( load_flags & FT_LOAD_NO_BITMAP ) == 0 )

2224 {

2225 error = load_sbit_image( size, glyph, glyph_index, load_flags );

2226 if ( !error )

2227 {

2228 if ( FT_IS_SCALABLE( glyph->face ) )

2229 {

2230 /* for the bbox we need the header only */

2231 (void)tt_loader_init( &loader, size, glyph, load_flags, TRUE );

2232 (void)load_truetype_glyph( &loader, glyph_index, 0, TRUE );

2233 glyph->linearHoriAdvance = loader.linear;

2234 glyph->linearVertAdvance = loader.top_bearing + loader.bbox.yMax -

2235 loader.vadvance;

2236

2237 /* sanity check: if `horiAdvance' in the sbit metric */

2238 /* structure isn't set, use `linearHoriAdvance' */

2239 if ( !glyph->metrics.horiAdvance && glyph->linearHoriAdvance )

2240 glyph->metrics.horiAdvance =

2241 FT_MulFix( glyph->linearHoriAdvance,

2242 size->root.metrics.x_scale );

2243 }

2244

2245 return FT_Err_Ok;

2246 }

2247 }

2248

2249 #endif /* TT_CONFIG_OPTION_EMBEDDED_BITMAPS */

2250

2251 /* if FT_LOAD_NO_SCALE is not set, `ttmetrics' must be valid */

2252 if ( !( load_flags & FT_LOAD_NO_SCALE ) && !size->ttmetrics.valid )

2253 return FT_THROW( Invalid_Size_Handle );

2254

2255 if ( load_flags & FT_LOAD_SBITS_ONLY )

2256 return FT_THROW( Invalid_Argument );

2257

2258 error = tt_loader_init( &loader, size, glyph, load_flags, FALSE );

2259 if ( error )

2260 return error;

2261

2262 glyph->format = FT_GLYPH_FORMAT_OUTLINE;

2263 glyph->num_subglyphs = 0;

2264 glyph->outline.flags = 0;

2265

2266 /* main loading loop */

2267 error = load_truetype_glyph( &loader, glyph_index, 0, FALSE );

2268 if ( !error )

2269 {

2270 if ( glyph->format == FT_GLYPH_FORMAT_COMPOSITE )

2271 {

2272 glyph->num_subglyphs = loader.gloader->base.num_subglyphs;

2273 glyph->subglyphs = loader.gloader->base.subglyphs;

2274 }

2275 else

2276 {

2277 glyph->outline = loader.gloader->base.outline;

2278 glyph->outline.flags &= ~FT_OUTLINE_SINGLE_PASS;

2279

2280 /* Translate array so that (0,0) is the glyph's origin. Note */

2281 /* that this behaviour is independent on the value of bit 1 of */

2282 /* the `flags' field in the `head' table -- at least major */

2283 /* applications like Acroread indicate that. */

2284 if ( loader.pp1.x )

2285 FT_Outline_Translate( &glyph->outline, -loader.pp1.x, 0 );

2286 }

2287

2288 #ifdef TT_USE_BYTECODE_INTERPRETER

2289

2290 if ( IS_HINTED( load_flags ) )

2291 {

2292 if ( loader.exec->GS.scan_control )

2293 {

2294 /* convert scan conversion mode to FT_OUTLINE_XXX flags */

2295 switch ( loader.exec->GS.scan_type )

2296 {

2297 case 0: /* simple drop-outs including stubs */

2298 glyph->outline.flags \|= FT_OUTLINE_INCLUDE_STUBS;

2299 break;

2300 case 1: /* simple drop-outs excluding stubs */

2301 /* nothing; it's the default rendering mode */

2302 break;

2303 case 4: /* smart drop-outs including stubs */

2304 glyph->outline.flags \|= FT_OUTLINE_SMART_DROPOUTS \|

2305 FT_OUTLINE_INCLUDE_STUBS;

2306 break;

2307 case 5: /* smart drop-outs excluding stubs */

2308 glyph->outline.flags \|= FT_OUTLINE_SMART_DROPOUTS;

2309 break;

2310

2311 default: /* no drop-out control */

2312 glyph->outline.flags \|= FT_OUTLINE_IGNORE_DROPOUTS;

2313 break;

2314 }

2315 }

2316 else

2317 glyph->outline.flags \|= FT_OUTLINE_IGNORE_DROPOUTS;

2318 }

2319

2320 #endif /* TT_USE_BYTECODE_INTERPRETER */

2321

2322 compute_glyph_metrics( &loader, glyph_index );

2323 }

2324

2325 /* Set the `high precision' bit flag. */

2326 /* This is _critical_ to get correct output for monochrome */

2327 /* TrueType glyphs at all sizes using the bytecode interpreter. */

2328 /* */

2329 if ( !( load_flags & FT_LOAD_NO_SCALE ) &&

2330 size->root.metrics.y_ppem < 24 )

2331 glyph->outline.flags \|= FT_OUTLINE_HIGH_PRECISION;

2332

2333 return error;

2334 }

2335

2336

2337 /* END */

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