ttobjs.c 30.8 KB
Newer Older
David Turner's avatar
David Turner committed
1
2
3
4
5
6
/***************************************************************************/
/*                                                                         */
/*  ttobjs.c                                                               */
/*                                                                         */
/*    Objects manager (body).                                              */
/*                                                                         */
Werner Lemberg's avatar
Werner Lemberg committed
7
/*  Copyright 1996-2001, 2002, 2003 by                                     */
David Turner's avatar
David Turner committed
8
9
/*  David Turner, Robert Wilhelm, and Werner Lemberg.                      */
/*                                                                         */
Werner Lemberg's avatar
   
Werner Lemberg committed
10
11
/*  This file is part of the FreeType project, and may only be used,       */
/*  modified, and distributed under the terms of the FreeType project      */
David Turner's avatar
David Turner committed
12
13
14
15
16
17
/*  license, LICENSE.TXT.  By continuing to use, modify, or distribute     */
/*  this file you indicate that you have read the license and              */
/*  understand and accept it fully.                                        */
/*                                                                         */
/***************************************************************************/

Werner Lemberg's avatar
   
Werner Lemberg committed
18

19
20
21
22
#include <ft2build.h>
#include FT_INTERNAL_DEBUG_H
#include FT_INTERNAL_CALC_H
#include FT_INTERNAL_STREAM_H
23
#include FT_TRUETYPE_IDS_H
24
25
26
27
#include FT_TRUETYPE_TAGS_H
#include FT_INTERNAL_SFNT_H
#include FT_INTERNAL_POSTSCRIPT_NAMES_H

28
29
#include "ttgload.h"
#include "ttpload.h"
Werner Lemberg's avatar
   
Werner Lemberg committed
30

31
32
#include "tterrors.h"

33
#ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER
34
#include "ttinterp.h"
35
36
#endif

37
#ifdef TT_CONFIG_OPTION_UNPATENTED_HINTING
38
39
#include FT_TRUETYPE_UNPATENTED_H
#endif
Werner Lemberg's avatar
   
Werner Lemberg committed
40
41
42
43
44
45
46

  /*************************************************************************/
  /*                                                                       */
  /* The macro FT_COMPONENT is used in trace mode.  It is an implicit      */
  /* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log  */
  /* messages during execution.                                            */
  /*                                                                       */
Werner Lemberg's avatar
   
Werner Lemberg committed
47
48
#undef  FT_COMPONENT
#define FT_COMPONENT  trace_ttobjs
David Turner's avatar
David Turner committed
49
50


Werner Lemberg's avatar
   
Werner Lemberg committed
51
52
#ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER

David Turner's avatar
David Turner committed
53
54
55
56
57
58
  /*************************************************************************/
  /*                                                                       */
  /*                       GLYPH ZONE FUNCTIONS                            */
  /*                                                                       */
  /*************************************************************************/

Werner Lemberg's avatar
   
Werner Lemberg committed
59

60
61
62
  /*************************************************************************/
  /*                                                                       */
  /* <Function>                                                            */
63
  /*    tt_glyphzone_done                                                  */
64
65
66
67
68
69
70
  /*                                                                       */
  /* <Description>                                                         */
  /*    Deallocates a glyph zone.                                          */
  /*                                                                       */
  /* <Input>                                                               */
  /*    zone :: A pointer to the target glyph zone.                        */
  /*                                                                       */
71
  FT_LOCAL_DEF( void )
72
  tt_glyphzone_done( TT_GlyphZone  zone )
73
74
75
  {
    FT_Memory  memory = zone->memory;

Werner Lemberg's avatar
Werner Lemberg committed
76

77
78
79
80
81
82
83
84
85
86
87
    if ( memory )
    {
      FT_FREE( zone->contours );
      FT_FREE( zone->tags );
      FT_FREE( zone->cur );
      FT_FREE( zone->org );

      zone->max_points   = zone->n_points   = 0;
      zone->max_contours = zone->n_contours = 0;
      zone->memory       = NULL;
    }
88
89
90
91
92
93
  }


  /*************************************************************************/
  /*                                                                       */
  /* <Function>                                                            */
94
  /*    tt_glyphzone_new                                                   */
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
  /*                                                                       */
  /* <Description>                                                         */
  /*    Allocates a new glyph zone.                                        */
  /*                                                                       */
  /* <Input>                                                               */
  /*    memory      :: A handle to the current memory object.              */
  /*                                                                       */
  /*    maxPoints   :: The capacity of glyph zone in points.               */
  /*                                                                       */
  /*    maxContours :: The capacity of glyph zone in contours.             */
  /*                                                                       */
  /* <Output>                                                              */
  /*    zone        :: A pointer to the target glyph zone record.          */
  /*                                                                       */
  /* <Return>                                                              */
  /*    FreeType error code.  0 means success.                             */
  /*                                                                       */
112
  FT_LOCAL_DEF( FT_Error )
113
  tt_glyphzone_new( FT_Memory     memory,
Werner Lemberg's avatar
   
Werner Lemberg committed
114
115
116
                    FT_UShort     maxPoints,
                    FT_Short      maxContours,
                    TT_GlyphZone  zone )
117
  {
Werner Lemberg's avatar
   
Werner Lemberg committed
118
119
    FT_Error  error;

120
121
122
123

    if ( maxPoints > 0 )
      maxPoints += 2;

Werner Lemberg's avatar
   
Werner Lemberg committed
124
    FT_MEM_ZERO( zone, sizeof ( *zone ) );
125
126
    zone->memory = memory;

127
128
129
130
    if ( FT_NEW_ARRAY( zone->org,      maxPoints * 2 ) ||
         FT_NEW_ARRAY( zone->cur,      maxPoints * 2 ) ||
         FT_NEW_ARRAY( zone->tags,     maxPoints     ) ||
         FT_NEW_ARRAY( zone->contours, maxContours   ) )
131
    {
132
      tt_glyphzone_done( zone );
133
134
135
136
    }

    return error;
  }
Werner Lemberg's avatar
   
Werner Lemberg committed
137
138
#endif /* TT_CONFIG_OPTION_BYTECODE_INTERPRETER */

139

David Turner's avatar
David Turner committed
140
141
142
  /*************************************************************************/
  /*                                                                       */
  /* <Function>                                                            */
143
  /*    tt_face_init                                                       */
David Turner's avatar
David Turner committed
144
145
146
147
148
  /*                                                                       */
  /* <Description>                                                         */
  /*    Initializes a given TrueType face object.                          */
  /*                                                                       */
  /* <Input>                                                               */
Werner Lemberg's avatar
   
Werner Lemberg committed
149
150
  /*    stream     :: The source font stream.                              */
  /*                                                                       */
David Turner's avatar
David Turner committed
151
  /*    face_index :: The index of the font face in the resource.          */
Werner Lemberg's avatar
   
Werner Lemberg committed
152
153
154
155
156
157
  /*                                                                       */
  /*    num_params :: Number of additional generic parameters.  Ignored.   */
  /*                                                                       */
  /*    params     :: Additional generic parameters.  Ignored.             */
  /*                                                                       */
  /* <InOut>                                                               */
David Turner's avatar
David Turner committed
158
159
160
  /*    face       :: The newly built face object.                         */
  /*                                                                       */
  /* <Return>                                                              */
Werner Lemberg's avatar
   
Werner Lemberg committed
161
  /*    FreeType error code.  0 means success.                             */
David Turner's avatar
David Turner committed
162
  /*                                                                       */
163
  FT_LOCAL_DEF( FT_Error )
164
  tt_face_init( FT_Stream      stream,
Werner Lemberg's avatar
   
Werner Lemberg committed
165
166
167
168
                TT_Face        face,
                FT_Int         face_index,
                FT_Int         num_params,
                FT_Parameter*  params )
David Turner's avatar
David Turner committed
169
  {
Werner Lemberg's avatar
   
Werner Lemberg committed
170
171
    FT_Error      error;
    FT_Library    library;
172
    SFNT_Service  sfnt;
Werner Lemberg's avatar
   
Werner Lemberg committed
173

Werner Lemberg's avatar
   
Werner Lemberg committed
174

David Turner's avatar
David Turner committed
175
    library = face->root.driver->root.library;
176
    sfnt    = (SFNT_Service)FT_Get_Module_Interface( library, "sfnt" );
Werner Lemberg's avatar
   
Werner Lemberg committed
177
178
    if ( !sfnt )
      goto Bad_Format;
179

David Turner's avatar
David Turner committed
180
    /* create input stream from resource */
181
    if ( FT_STREAM_SEEK( 0 ) )
David Turner's avatar
David Turner committed
182
183
      goto Exit;

184
    /* check that we have a valid TrueType file */
185
    error = sfnt->init_face( stream, face, face_index, num_params, params );
Werner Lemberg's avatar
   
Werner Lemberg committed
186
187
    if ( error )
      goto Exit;
188

189
    /* We must also be able to accept Mac/GX fonts, as well as OT ones */
Werner Lemberg's avatar
   
Werner Lemberg committed
190
191
    if ( face->format_tag != 0x00010000L &&    /* MS fonts  */
         face->format_tag != TTAG_true   )     /* Mac fonts */
192
    {
Werner Lemberg's avatar
   
Werner Lemberg committed
193
      FT_TRACE2(( "[not a valid TTF font]\n" ));
194
      goto Bad_Format;
195
196
    }

Werner Lemberg's avatar
   
Werner Lemberg committed
197
    /* If we are performing a simple font format check, exit immediately */
David Turner's avatar
David Turner committed
198
199
200
    if ( face_index < 0 )
      return TT_Err_Ok;

201
202
    /* Load font directory */
    error = sfnt->load_face( stream, face, face_index, num_params, params );
Werner Lemberg's avatar
   
Werner Lemberg committed
203
204
    if ( error )
      goto Exit;
David Turner's avatar
David Turner committed
205

Werner Lemberg's avatar
   
Werner Lemberg committed
206
    if ( face->root.face_flags & FT_FACE_FLAG_SCALABLE )
Werner Lemberg's avatar
Werner Lemberg committed
207
    {
Werner Lemberg's avatar
   
Werner Lemberg committed
208

209
#ifdef FT_CONFIG_OPTION_INCREMENTAL
Werner Lemberg's avatar
   
Werner Lemberg committed
210

Werner Lemberg's avatar
Werner Lemberg committed
211
212
213
214
215
      if ( !face->root.internal->incremental_interface )
        error = tt_face_load_loca( face, stream );
      if ( !error )
        error = tt_face_load_cvt( face, stream ) ||
                tt_face_load_fpgm( face, stream );
Werner Lemberg's avatar
   
Werner Lemberg committed
216

217
#else
Werner Lemberg's avatar
   
Werner Lemberg committed
218

Werner Lemberg's avatar
Werner Lemberg committed
219
220
221
222
      if ( !error )
        error = tt_face_load_loca( face, stream ) ||
                tt_face_load_cvt( face, stream )  ||
                tt_face_load_fpgm( face, stream );
Werner Lemberg's avatar
   
Werner Lemberg committed
223

224
#endif
Werner Lemberg's avatar
   
Werner Lemberg committed
225

Werner Lemberg's avatar
Werner Lemberg committed
226
    }
Werner Lemberg's avatar
   
Werner Lemberg committed
227

228
#ifdef TT_CONFIG_OPTION_UNPATENTED_HINTING
229

Werner Lemberg's avatar
Werner Lemberg committed
230
    /* Determine whether unpatented hinting is to be used for this face. */
231
232
    face->unpatented_hinting =
       ( library->debug_hooks[ FT_DEBUG_HOOK_UNPATENTED_HINTING ] != NULL );
233
234

    {
Werner Lemberg's avatar
Werner Lemberg committed
235
236
      int i;

237

Werner Lemberg's avatar
Werner Lemberg committed
238
239
240
      for ( i = 0; i < num_params && !face->unpatented_hinting; i++ )
        if ( params[i].tag == FT_PARAM_TAG_UNPATENTED_HINTING )
          face->unpatented_hinting = TRUE;
241
242
    }

243
#endif /* TT_CONFIG_OPTION_UNPATENTED_HINTING */
244

Werner Lemberg's avatar
   
Werner Lemberg committed
245
    /* initialize standard glyph loading routines */
246
247
    TT_Init_Glyph_Loading( face );

David Turner's avatar
David Turner committed
248
249
  Exit:
    return error;
Werner Lemberg's avatar
   
Werner Lemberg committed
250

251
  Bad_Format:
Werner Lemberg's avatar
Werner Lemberg committed
252
    error = TT_Err_Unknown_File_Format;
253
    goto Exit;
David Turner's avatar
David Turner committed
254
255
256
257
258
259
  }


  /*************************************************************************/
  /*                                                                       */
  /* <Function>                                                            */
260
  /*    tt_face_done                                                       */
David Turner's avatar
David Turner committed
261
262
263
264
265
266
267
  /*                                                                       */
  /* <Description>                                                         */
  /*    Finalizes a given face object.                                     */
  /*                                                                       */
  /* <Input>                                                               */
  /*    face :: A pointer to the face object to destroy.                   */
  /*                                                                       */
268
  FT_LOCAL_DEF( void )
269
  tt_face_done( TT_Face  face )
David Turner's avatar
David Turner committed
270
  {
Werner Lemberg's avatar
   
Werner Lemberg committed
271
272
    FT_Memory     memory = face->root.memory;
    FT_Stream     stream = face->root.stream;
David Turner's avatar
David Turner committed
273

Werner Lemberg's avatar
   
Werner Lemberg committed
274
    SFNT_Service  sfnt   = (SFNT_Service)face->sfnt;
275

Werner Lemberg's avatar
   
Werner Lemberg committed
276

Werner Lemberg's avatar
   
Werner Lemberg committed
277
278
    /* for `extended TrueType formats' (i.e. compressed versions) */
    if ( face->extra.finalizer )
279
      face->extra.finalizer( face->extra.data );
Werner Lemberg's avatar
   
Werner Lemberg committed
280
281
282

    if ( sfnt )
      sfnt->done_face( face );
David Turner's avatar
David Turner committed
283
284

    /* freeing the locations table */
285
    FT_FREE( face->glyph_locations );
David Turner's avatar
David Turner committed
286
287
288
    face->num_locations = 0;

    /* freeing the CVT */
289
    FT_FREE( face->cvt );
David Turner's avatar
David Turner committed
290
291
292
    face->cvt_size = 0;

    /* freeing the programs */
293
294
    FT_FRAME_RELEASE( face->font_program );
    FT_FRAME_RELEASE( face->cvt_program );
David Turner's avatar
David Turner committed
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
    face->font_program_size = 0;
    face->cvt_program_size  = 0;
  }


  /*************************************************************************/
  /*                                                                       */
  /*                           SIZE  FUNCTIONS                             */
  /*                                                                       */
  /*************************************************************************/


  /*************************************************************************/
  /*                                                                       */
  /* <Function>                                                            */
310
  /*    tt_size_init                                                       */
David Turner's avatar
David Turner committed
311
312
313
314
315
316
317
318
  /*                                                                       */
  /* <Description>                                                         */
  /*    Initializes a new TrueType size object.                            */
  /*                                                                       */
  /* <InOut>                                                               */
  /*    size :: A handle to the size object.                               */
  /*                                                                       */
  /* <Return>                                                              */
Werner Lemberg's avatar
   
Werner Lemberg committed
319
  /*    FreeType error code.  0 means success.                             */
David Turner's avatar
David Turner committed
320
  /*                                                                       */
321
  FT_LOCAL_DEF( FT_Error )
322
  tt_size_init( TT_Size  size )
David Turner's avatar
David Turner committed
323
  {
Werner Lemberg's avatar
   
Werner Lemberg committed
324
325
    FT_Error  error = TT_Err_Ok;

326

327
#ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER
Werner Lemberg's avatar
   
Werner Lemberg committed
328

David Turner's avatar
David Turner committed
329
330
    TT_Face    face   = (TT_Face)size->root.face;
    FT_Memory  memory = face->root.memory;
331
    FT_Int     i;
David Turner's avatar
David Turner committed
332
333

    TT_ExecContext  exec;
334
    FT_UShort       n_twilight;
335
    TT_MaxProfile*  maxp = &face->max_profile;
David Turner's avatar
David Turner committed
336

Werner Lemberg's avatar
   
Werner Lemberg committed
337

David Turner's avatar
David Turner committed
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
    size->ttmetrics.valid = FALSE;

    size->max_function_defs    = maxp->maxFunctionDefs;
    size->max_instruction_defs = maxp->maxInstructionDefs;

    size->num_function_defs    = 0;
    size->num_instruction_defs = 0;

    size->max_func = 0;
    size->max_ins  = 0;

    size->cvt_size     = face->cvt_size;
    size->storage_size = maxp->maxStorage;

    /* Set default metrics */
    {
      FT_Size_Metrics*  metrics  = &size->root.metrics;
      TT_Size_Metrics*  metrics2 = &size->ttmetrics;

Werner Lemberg's avatar
   
Werner Lemberg committed
357

David Turner's avatar
David Turner committed
358
359
360
361
362
363
364
365
366
367
368
      metrics->x_ppem = 0;
      metrics->y_ppem = 0;

      metrics2->rotated   = FALSE;
      metrics2->stretched = FALSE;

      /* set default compensation (all 0) */
      for ( i = 0; i < 4; i++ )
        metrics2->compensations[i] = 0;
    }

Werner Lemberg's avatar
   
Werner Lemberg committed
369
    /* allocate function defs, instruction defs, cvt, and storage area */
Werner Lemberg's avatar
   
Werner Lemberg committed
370
    if ( FT_NEW_ARRAY( size->function_defs,    size->max_function_defs    ) ||
371
         FT_NEW_ARRAY( size->instruction_defs, size->max_instruction_defs ) ||
Werner Lemberg's avatar
   
Werner Lemberg committed
372
373
         FT_NEW_ARRAY( size->cvt,              size->cvt_size             ) ||
         FT_NEW_ARRAY( size->storage,          size->storage_size         ) )
David Turner's avatar
David Turner committed
374
375
376
377
378

      goto Fail_Memory;

    /* reserve twilight zone */
    n_twilight = maxp->maxTwilightPoints;
379
    error = tt_glyphzone_new( memory, n_twilight, 0, &size->twilight );
David Turner's avatar
David Turner committed
380
381
382
383
384
385
386
    if ( error )
      goto Fail_Memory;

    size->twilight.n_points = n_twilight;

    /* set `face->interpreter' according to the debug hook present */
    {
David Turner's avatar
David Turner committed
387
      FT_Library  library = face->root.driver->root.library;
388

Werner Lemberg's avatar
   
Werner Lemberg committed
389

David Turner's avatar
David Turner committed
390
      face->interpreter = (TT_Interpreter)
Werner Lemberg's avatar
   
Werner Lemberg committed
391
392
                            library->debug_hooks[FT_DEBUG_HOOK_TRUETYPE];
      if ( !face->interpreter )
David Turner's avatar
David Turner committed
393
394
395
396
397
398
        face->interpreter = (TT_Interpreter)TT_RunIns;
    }

    /* Fine, now execute the font program! */
    exec = size->context;
    /* size objects used during debugging have their own context */
Werner Lemberg's avatar
   
Werner Lemberg committed
399
400
    if ( !size->debug )
      exec = TT_New_Context( face );
David Turner's avatar
David Turner committed
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422

    if ( !exec )
    {
      error = TT_Err_Could_Not_Find_Context;
      goto Fail_Memory;
    }

    size->GS = tt_default_graphics_state;
    TT_Load_Context( exec, face, size );

    exec->callTop   = 0;
    exec->top       = 0;

    exec->period    = 64;
    exec->phase     = 0;
    exec->threshold = 0;

    {
      FT_Size_Metrics*  metrics    = &exec->metrics;
      TT_Size_Metrics*  tt_metrics = &exec->tt_metrics;


Werner Lemberg's avatar
   
Werner Lemberg committed
423
424
425
426
      metrics->x_ppem   = 0;
      metrics->y_ppem   = 0;
      metrics->x_scale  = 0;
      metrics->y_scale  = 0;
David Turner's avatar
David Turner committed
427

Werner Lemberg's avatar
   
Werner Lemberg committed
428
429
430
      tt_metrics->ppem  = 0;
      tt_metrics->scale = 0;
      tt_metrics->ratio = 0x10000L;
David Turner's avatar
David Turner committed
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
    }

    exec->instruction_trap = FALSE;

    exec->cvtSize = size->cvt_size;
    exec->cvt     = size->cvt;

    exec->F_dot_P = 0x10000L;

    /* allow font program execution */
    TT_Set_CodeRange( exec,
                      tt_coderange_font,
                      face->font_program,
                      face->font_program_size );

    /* disable CVT and glyph programs coderange */
    TT_Clear_CodeRange( exec, tt_coderange_cvt );
    TT_Clear_CodeRange( exec, tt_coderange_glyph );

    if ( face->font_program_size > 0 )
    {
      error = TT_Goto_CodeRange( exec, tt_coderange_font, 0 );
      if ( !error )
        error = face->interpreter( exec );

      if ( error )
        goto Fail_Exec;
    }
    else
      error = TT_Err_Ok;

    TT_Save_Context( exec, size );

    if ( !size->debug )
      TT_Done_Context( exec );

467
468
#endif /* TT_CONFIG_OPTION_BYTECODE_INTERPRETER */

David Turner's avatar
David Turner committed
469
470
471
    size->ttmetrics.valid = FALSE;
    return error;

472
#ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER
Werner Lemberg's avatar
   
Werner Lemberg committed
473

David Turner's avatar
David Turner committed
474
475
476
477
478
  Fail_Exec:
    if ( !size->debug )
      TT_Done_Context( exec );

  Fail_Memory:
Werner Lemberg's avatar
   
Werner Lemberg committed
479

480
    tt_size_done( size );
David Turner's avatar
David Turner committed
481
    return error;
Werner Lemberg's avatar
   
Werner Lemberg committed
482
483
484

#endif /* TT_CONFIG_OPTION_BYTECODE_INTERPRETER */

David Turner's avatar
David Turner committed
485
486
487
488
489
490
  }


  /*************************************************************************/
  /*                                                                       */
  /* <Function>                                                            */
491
  /*    tt_size_done                                                       */
David Turner's avatar
David Turner committed
492
493
494
495
496
497
498
  /*                                                                       */
  /* <Description>                                                         */
  /*    The TrueType size object finalizer.                                */
  /*                                                                       */
  /* <Input>                                                               */
  /*    size :: A handle to the target size object.                        */
  /*                                                                       */
499
  FT_LOCAL_DEF( void )
500
  tt_size_done( TT_Size  size )
David Turner's avatar
David Turner committed
501
  {
Werner Lemberg's avatar
   
Werner Lemberg committed
502

503
#ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER
Werner Lemberg's avatar
   
Werner Lemberg committed
504

David Turner's avatar
David Turner committed
505
506
    FT_Memory  memory = size->root.face->memory;

Werner Lemberg's avatar
   
Werner Lemberg committed
507

David Turner's avatar
David Turner committed
508
509
510
511
512
513
514
    if ( size->debug )
    {
      /* the debug context must be deleted by the debugger itself */
      size->context = NULL;
      size->debug   = FALSE;
    }

515
    FT_FREE( size->cvt );
David Turner's avatar
David Turner committed
516
517
518
    size->cvt_size = 0;

    /* free storage area */
519
    FT_FREE( size->storage );
David Turner's avatar
David Turner committed
520
521
522
    size->storage_size = 0;

    /* twilight zone */
523
    tt_glyphzone_done( &size->twilight );
David Turner's avatar
David Turner committed
524

525
526
    FT_FREE( size->function_defs );
    FT_FREE( size->instruction_defs );
Werner Lemberg's avatar
   
Werner Lemberg committed
527

David Turner's avatar
David Turner committed
528
529
530
531
532
533
534
    size->num_function_defs    = 0;
    size->max_function_defs    = 0;
    size->num_instruction_defs = 0;
    size->max_instruction_defs = 0;

    size->max_func = 0;
    size->max_ins  = 0;
Werner Lemberg's avatar
   
Werner Lemberg committed
535

536
#endif
David Turner's avatar
David Turner committed
537
538
539
540
541
542
543
544

    size->ttmetrics.valid = FALSE;
  }


  /*************************************************************************/
  /*                                                                       */
  /* <Function>                                                            */
Werner Lemberg's avatar
   
Werner Lemberg committed
545
  /*    Reset_Outline_Size                                                 */
David Turner's avatar
David Turner committed
546
547
  /*                                                                       */
  /* <Description>                                                         */
Werner Lemberg's avatar
   
Werner Lemberg committed
548
549
  /*    Resets a TrueType outline size when resolutions and character      */
  /*    dimensions have been changed.                                      */
David Turner's avatar
David Turner committed
550
551
552
553
  /*                                                                       */
  /* <Input>                                                               */
  /*    size :: A handle to the target size object.                        */
  /*                                                                       */
Werner Lemberg's avatar
   
Werner Lemberg committed
554
555
  static FT_Error
  Reset_Outline_Size( TT_Size  size )
David Turner's avatar
David Turner committed
556
  {
Werner Lemberg's avatar
   
Werner Lemberg committed
557
558
    TT_Face           face;
    FT_Error          error = TT_Err_Ok;
David Turner's avatar
David Turner committed
559
560
561

    FT_Size_Metrics*  metrics;

Werner Lemberg's avatar
   
Werner Lemberg committed
562

David Turner's avatar
David Turner committed
563
564
565
566
567
    if ( size->ttmetrics.valid )
      return TT_Err_Ok;

    face = (TT_Face)size->root.face;

568
    metrics = &size->metrics;
David Turner's avatar
David Turner committed
569
570
571
572
573
574
575
576
577

    if ( metrics->x_ppem < 1 || metrics->y_ppem < 1 )
      return TT_Err_Invalid_PPem;

    /* compute new transformation */
    if ( metrics->x_ppem >= metrics->y_ppem )
    {
      size->ttmetrics.scale   = metrics->x_scale;
      size->ttmetrics.ppem    = metrics->x_ppem;
Werner Lemberg's avatar
   
Werner Lemberg committed
578
      size->ttmetrics.x_ratio = 0x10000L;
David Turner's avatar
David Turner committed
579
580
581
582
583
584
585
586
587
588
589
      size->ttmetrics.y_ratio = FT_MulDiv( metrics->y_ppem,
                                           0x10000L,
                                           metrics->x_ppem );
    }
    else
    {
      size->ttmetrics.scale   = metrics->y_scale;
      size->ttmetrics.ppem    = metrics->y_ppem;
      size->ttmetrics.x_ratio = FT_MulDiv( metrics->x_ppem,
                                           0x10000L,
                                           metrics->y_ppem );
Werner Lemberg's avatar
   
Werner Lemberg committed
590
      size->ttmetrics.y_ratio = 0x10000L;
David Turner's avatar
David Turner committed
591
592
    }

Werner Lemberg's avatar
   
Werner Lemberg committed
593
    /* Compute root ascender, descender, text height, and max_advance */
Werner Lemberg's avatar
   
Werner Lemberg committed
594
595
596
597
598
599
600
601
    metrics->ascender    = ( FT_MulFix( face->root.ascender,
                                        metrics->y_scale ) + 32 ) & -64;
    metrics->descender   = ( FT_MulFix( face->root.descender,
                                        metrics->y_scale ) + 32 ) & -64;
    metrics->height      = ( FT_MulFix( face->root.height,
                                        metrics->y_scale ) + 32 ) & -64;
    metrics->max_advance = ( FT_MulFix( face->root.max_advance_width,
                                        metrics->x_scale ) + 32 ) & -64;
David Turner's avatar
David Turner committed
602

603

604
#ifdef TT_CONFIG_OPTION_EMBEDDED_BITMAPS
Werner Lemberg's avatar
   
Werner Lemberg committed
605
    /* set to `invalid' by default */
Werner Lemberg's avatar
   
Werner Lemberg committed
606
    size->strike_index = 0xFFFFU;
607
608
#endif

609
610
#ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER

David Turner's avatar
David Turner committed
611
    {
Werner Lemberg's avatar
   
Werner Lemberg committed
612
613
      TT_ExecContext  exec;
      FT_UInt         i, j;
614

Werner Lemberg's avatar
   
Werner Lemberg committed
615

616
617
618
619
      /* Scale the cvt values to the new ppem.          */
      /* We use by default the y ppem to scale the CVT. */
      for ( i = 0; i < size->cvt_size; i++ )
        size->cvt[i] = FT_MulFix( face->cvt[i], size->ttmetrics.scale );
620

621
      /* All twilight points are originally zero */
622
      for ( j = 0; j < (FT_UInt)size->twilight.n_points; j++ )
623
624
625
626
627
628
      {
        size->twilight.org[j].x = 0;
        size->twilight.org[j].y = 0;
        size->twilight.cur[j].x = 0;
        size->twilight.cur[j].y = 0;
      }
629

630
      /* clear storage area */
631
      for ( i = 0; i < (FT_UInt)size->storage_size; i++ )
632
        size->storage[i] = 0;
633

634
      size->GS = tt_default_graphics_state;
635

636
637
638
639
640
641
      /* get execution context and run prep program */
      if ( size->debug )
        exec = size->context;
      else
        exec = TT_New_Context( face );
      /* debugging instances have their own context */
642

643
644
      if ( !exec )
        return TT_Err_Could_Not_Find_Context;
645

646
      TT_Load_Context( exec, face, size );
647

648
649
650
651
      TT_Set_CodeRange( exec,
                        tt_coderange_cvt,
                        face->cvt_program,
                        face->cvt_program_size );
652

653
      TT_Clear_CodeRange( exec, tt_coderange_glyph );
654

655
      exec->instruction_trap = FALSE;
656

657
658
      exec->top     = 0;
      exec->callTop = 0;
659

660
661
662
663
      if ( face->cvt_program_size > 0 )
      {
        error = TT_Goto_CodeRange( exec, tt_coderange_cvt, 0 );
        if ( error )
Werner Lemberg's avatar
   
Werner Lemberg committed
664
          goto End;
665

666
667
668
669
670
        if ( !size->debug )
          error = face->interpreter( exec );
      }
      else
        error = TT_Err_Ok;
671

672
673
      size->GS = exec->GS;
      /* save default graphics state */
674

Werner Lemberg's avatar
   
Werner Lemberg committed
675
    End:
676
      TT_Save_Context( exec, size );
677

David Turner's avatar
David Turner committed
678
      if ( !size->debug )
679
680
        TT_Done_Context( exec );
      /* debugging instances keep their context */
David Turner's avatar
David Turner committed
681
    }
Werner Lemberg's avatar
   
Werner Lemberg committed
682

683
#endif /* TT_CONFIG_OPTION_BYTECODE_INTERPRETER */
David Turner's avatar
David Turner committed
684
685
686
687
688
689
690

    if ( !error )
      size->ttmetrics.valid = TRUE;

    return error;
  }

Werner Lemberg's avatar
   
Werner Lemberg committed
691

692
#ifdef TT_CONFIG_OPTION_EMBEDDED_BITMAPS
Werner Lemberg's avatar
   
Werner Lemberg committed
693
694
695
696
697
698
699
700
701
702
703
704
705

  /*************************************************************************/
  /*                                                                       */
  /* <Function>                                                            */
  /*    Reset_SBit_Size                                                    */
  /*                                                                       */
  /* <Description>                                                         */
  /*    Resets a TrueType sbit size when resolutions and character         */
  /*    dimensions have been changed.                                      */
  /*                                                                       */
  /* <Input>                                                               */
  /*    size :: A handle to the target size object.                        */
  /*                                                                       */
Werner Lemberg's avatar
   
Werner Lemberg committed
706
707
  static FT_Error
  Reset_SBit_Size( TT_Size  size )
708
709
710
711
712
713
714
  {
    TT_Face           face;
    FT_Error          error = TT_Err_Ok;

    FT_ULong          strike_index;
    FT_Size_Metrics*  metrics;
    FT_Size_Metrics*  sbit_metrics;
Werner Lemberg's avatar
   
Werner Lemberg committed
715
    SFNT_Service      sfnt;
716

Werner Lemberg's avatar
   
Werner Lemberg committed
717

718
    metrics = &size->metrics;
719

Werner Lemberg's avatar
   
Werner Lemberg committed
720
    if ( size->strike_index != 0xFFFFU )
721
722
723
      return TT_Err_Ok;

    face = (TT_Face)size->root.face;
724
    sfnt = (SFNT_Service)face->sfnt;
725
726
727

    sbit_metrics = &size->strike_metrics;

Werner Lemberg's avatar
   
Werner Lemberg committed
728
729
730
    error = sfnt->set_sbit_strike( face,
                                   metrics->x_ppem, metrics->y_ppem,
                                   &strike_index );
731

Werner Lemberg's avatar
   
Werner Lemberg committed
732
    if ( !error )
733
    {
Werner Lemberg's avatar
   
Werner Lemberg committed
734
      TT_SBit_Strike  strike = face->sbit_strikes + strike_index;
Werner Lemberg's avatar
   
Werner Lemberg committed
735
736


Werner Lemberg's avatar
   
Werner Lemberg committed
737
738
      sbit_metrics->x_ppem = metrics->x_ppem;
      sbit_metrics->y_ppem = metrics->y_ppem;
739
740
741
742
743
#if 0
      /*
       * sbit_metrics->?_scale
       * are not used now.
       */
Werner Lemberg's avatar
   
Werner Lemberg committed
744
745
      sbit_metrics->x_scale = 1 << 16;
      sbit_metrics->y_scale = 1 << 16;
746
#endif
Werner Lemberg's avatar
   
Werner Lemberg committed
747

Werner Lemberg's avatar
   
Werner Lemberg committed
748
749
      sbit_metrics->ascender  = strike->hori.ascender << 6;
      sbit_metrics->descender = strike->hori.descender << 6;
Werner Lemberg's avatar
   
Werner Lemberg committed
750

751
      /* XXX: Is this correct? */
Werner Lemberg's avatar
   
Werner Lemberg committed
752
      sbit_metrics->height = sbit_metrics->ascender - sbit_metrics->descender;
Werner Lemberg's avatar
   
Werner Lemberg committed
753

754
      /* XXX: Is this correct? */
755
756
      sbit_metrics->max_advance = ( strike->hori.min_origin_SB  +
                                    strike->hori.max_width      +
757
758
                                    strike->hori.min_advance_SB ) << 6;

Werner Lemberg's avatar
   
Werner Lemberg committed
759
      size->strike_index = (FT_UInt)strike_index;
760
761
762
    }
    else
    {
Werner Lemberg's avatar
   
Werner Lemberg committed
763
      size->strike_index = 0xFFFFU;
Werner Lemberg's avatar
   
Werner Lemberg committed
764

765
766
767
768
769
770
771
772
773
774
      sbit_metrics->x_ppem      = 0;
      sbit_metrics->y_ppem      = 0;
      sbit_metrics->ascender    = 0;
      sbit_metrics->descender   = 0;
      sbit_metrics->height      = 0;
      sbit_metrics->max_advance = 0;
    }

    return error;
  }
Werner Lemberg's avatar
   
Werner Lemberg committed
775

776
777
#endif /* TT_CONFIG_OPTION_EMBEDDED_BITMAPS */

Werner Lemberg's avatar
   
Werner Lemberg committed
778

779
780
781
  /*************************************************************************/
  /*                                                                       */
  /* <Function>                                                            */
782
  /*    tt_size_reset                                                      */
783
784
785
786
787
788
789
790
  /*                                                                       */
  /* <Description>                                                         */
  /*    Resets a TrueType size when resolutions and character dimensions   */
  /*    have been changed.                                                 */
  /*                                                                       */
  /* <Input>                                                               */
  /*    size :: A handle to the target size object.                        */
  /*                                                                       */
791
  FT_LOCAL_DEF( FT_Error )
792
  tt_size_reset( TT_Size  size )
793
  {
Werner Lemberg's avatar
   
Werner Lemberg committed
794
    FT_Face   face;
795
796
    FT_Error  error = TT_Err_Ok;

Werner Lemberg's avatar
   
Werner Lemberg committed
797

798
799
800
801
802
    face = size->root.face;

    if ( face->face_flags & FT_FACE_FLAG_SCALABLE )
    {
      if ( !size->ttmetrics.valid )
Werner Lemberg's avatar
   
Werner Lemberg committed
803
        error = Reset_Outline_Size( size );
804
805

      if ( error )
Werner Lemberg's avatar
   
Werner Lemberg committed
806
        return error;
807
808
809
    }

#ifdef TT_CONFIG_OPTION_EMBEDDED_BITMAPS
Werner Lemberg's avatar
   
Werner Lemberg committed
810

811
812
    if ( face->face_flags & FT_FACE_FLAG_FIXED_SIZES )
    {
Werner Lemberg's avatar
   
Werner Lemberg committed
813
      if ( size->strike_index == 0xFFFFU )
814
815
        error = Reset_SBit_Size( size );

Werner Lemberg's avatar
   
Werner Lemberg committed
816
      if ( !error && !( face->face_flags & FT_FACE_FLAG_SCALABLE ) )
817
        size->root.metrics = size->strike_metrics;
818
    }
Werner Lemberg's avatar
   
Werner Lemberg committed
819
820
821
822

#endif /* TT_CONFIG_OPTION_EMBEDDED_BITMAPS */

    if ( face->face_flags & FT_FACE_FLAG_SCALABLE )
823
824
825
826
      return TT_Err_Ok;
    else
      return error;
  }
David Turner's avatar
David Turner committed
827

Werner Lemberg's avatar
   
Werner Lemberg committed
828

David Turner's avatar
David Turner committed
829
830
831
  /*************************************************************************/
  /*                                                                       */
  /* <Function>                                                            */
832
  /*    tt_driver_init                                                     */
David Turner's avatar
David Turner committed
833
834
835
836
837
838
839
840
  /*                                                                       */
  /* <Description>                                                         */
  /*    Initializes a given TrueType driver object.                        */
  /*                                                                       */
  /* <Input>                                                               */
  /*    driver :: A handle to the target driver object.                    */
  /*                                                                       */
  /* <Return>                                                              */
Werner Lemberg's avatar
   
Werner Lemberg committed
841
  /*    FreeType error code.  0 means success.                             */
David Turner's avatar
David Turner committed
842
  /*                                                                       */
843
  FT_LOCAL_DEF( FT_Error )
844
  tt_driver_init( TT_Driver  driver )
David Turner's avatar
David Turner committed
845
  {
Werner Lemberg's avatar
   
Werner Lemberg committed
846
    FT_Error  error;
Werner Lemberg's avatar
   
Werner Lemberg committed
847

Werner Lemberg's avatar
   
Werner Lemberg committed
848
849

    /* set `extra' in glyph loader */
David Turner's avatar
David Turner committed
850
    error = FT_GlyphLoader_CreateExtra( FT_DRIVER( driver )->glyph_loader );
Werner Lemberg's avatar
   
Werner Lemberg committed
851

David Turner's avatar
David Turner committed
852
    return error;
David Turner's avatar
David Turner committed
853
854
855
856
857
858
  }


  /*************************************************************************/
  /*                                                                       */
  /* <Function>                                                            */
859
  /*    tt_driver_done                                                     */
David Turner's avatar
David Turner committed
860
861
862
863
864
865
866
  /*                                                                       */
  /* <Description>                                                         */
  /*    Finalizes a given TrueType driver.                                 */
  /*                                                                       */
  /* <Input>                                                               */
  /*    driver :: A handle to the target TrueType driver.                  */
  /*                                                                       */
867
  FT_LOCAL_DEF( void )
868
  tt_driver_done( TT_Driver  driver )
David Turner's avatar
David Turner committed
869
  {
870
#ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER
Werner Lemberg's avatar
   
Werner Lemberg committed
871

David Turner's avatar
David Turner committed
872
873
874
    /* destroy the execution context */
    if ( driver->context )
    {
David Turner's avatar
David Turner committed
875
      TT_Destroy_Context( driver->context, driver->root.root.memory );
David Turner's avatar
David Turner committed
876
877
      driver->context = NULL;
    }
878
#else
Werner Lemberg's avatar
   
Werner Lemberg committed
879
    FT_UNUSED( driver );
880
#endif
Werner Lemberg's avatar
   
Werner Lemberg committed
881

David Turner's avatar
David Turner committed
882
883
884
885
  }


/* END */