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/src/compiler/android-ndk/jni/freetype/src/truetype/ttobjs.c

http://ftk.googlecode.com/
C | 951 lines | 501 code | 200 blank | 250 comment | 68 complexity | ddc0be9cf84a2a87309c79c95b1ca391 MD5 | raw file
  1/***************************************************************************/
  2/*                                                                         */
  3/*  ttobjs.c                                                               */
  4/*                                                                         */
  5/*    Objects manager (body).                                              */
  6/*                                                                         */
  7/*  Copyright 1996-2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 by */
  8/*  David Turner, Robert Wilhelm, and Werner Lemberg.                      */
  9/*                                                                         */
 10/*  This file is part of the FreeType project, and may only be used,       */
 11/*  modified, and distributed under the terms of the FreeType project      */
 12/*  license, LICENSE.TXT.  By continuing to use, modify, or distribute     */
 13/*  this file you indicate that you have read the license and              */
 14/*  understand and accept it fully.                                        */
 15/*                                                                         */
 16/***************************************************************************/
 17
 18
 19#include <ft2build.h>
 20#include FT_INTERNAL_DEBUG_H
 21#include FT_INTERNAL_STREAM_H
 22#include FT_TRUETYPE_TAGS_H
 23#include FT_INTERNAL_SFNT_H
 24
 25#include "ttgload.h"
 26#include "ttpload.h"
 27
 28#include "tterrors.h"
 29
 30#ifdef TT_USE_BYTECODE_INTERPRETER
 31#include "ttinterp.h"
 32#endif
 33
 34#ifdef TT_CONFIG_OPTION_UNPATENTED_HINTING
 35#include FT_TRUETYPE_UNPATENTED_H
 36#endif
 37
 38#ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT
 39#include "ttgxvar.h"
 40#endif
 41
 42  /*************************************************************************/
 43  /*                                                                       */
 44  /* The macro FT_COMPONENT is used in trace mode.  It is an implicit      */
 45  /* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log  */
 46  /* messages during execution.                                            */
 47  /*                                                                       */
 48#undef  FT_COMPONENT
 49#define FT_COMPONENT  trace_ttobjs
 50
 51
 52#ifdef TT_USE_BYTECODE_INTERPRETER
 53
 54  /*************************************************************************/
 55  /*                                                                       */
 56  /*                       GLYPH ZONE FUNCTIONS                            */
 57  /*                                                                       */
 58  /*************************************************************************/
 59
 60
 61  /*************************************************************************/
 62  /*                                                                       */
 63  /* <Function>                                                            */
 64  /*    tt_glyphzone_done                                                  */
 65  /*                                                                       */
 66  /* <Description>                                                         */
 67  /*    Deallocate a glyph zone.                                           */
 68  /*                                                                       */
 69  /* <Input>                                                               */
 70  /*    zone :: A pointer to the target glyph zone.                        */
 71  /*                                                                       */
 72  FT_LOCAL_DEF( void )
 73  tt_glyphzone_done( TT_GlyphZone  zone )
 74  {
 75    FT_Memory  memory = zone->memory;
 76
 77
 78    if ( memory )
 79    {
 80      FT_FREE( zone->contours );
 81      FT_FREE( zone->tags );
 82      FT_FREE( zone->cur );
 83      FT_FREE( zone->org );
 84      FT_FREE( zone->orus );
 85
 86      zone->max_points   = zone->n_points   = 0;
 87      zone->max_contours = zone->n_contours = 0;
 88      zone->memory       = NULL;
 89    }
 90  }
 91
 92
 93  /*************************************************************************/
 94  /*                                                                       */
 95  /* <Function>                                                            */
 96  /*    tt_glyphzone_new                                                   */
 97  /*                                                                       */
 98  /* <Description>                                                         */
 99  /*    Allocate a new glyph zone.                                         */
100  /*                                                                       */
101  /* <Input>                                                               */
102  /*    memory      :: A handle to the current memory object.              */
103  /*                                                                       */
104  /*    maxPoints   :: The capacity of glyph zone in points.               */
105  /*                                                                       */
106  /*    maxContours :: The capacity of glyph zone in contours.             */
107  /*                                                                       */
108  /* <Output>                                                              */
109  /*    zone        :: A pointer to the target glyph zone record.          */
110  /*                                                                       */
111  /* <Return>                                                              */
112  /*    FreeType error code.  0 means success.                             */
113  /*                                                                       */
114  FT_LOCAL_DEF( FT_Error )
115  tt_glyphzone_new( FT_Memory     memory,
116                    FT_UShort     maxPoints,
117                    FT_Short      maxContours,
118                    TT_GlyphZone  zone )
119  {
120    FT_Error  error;
121
122
123    FT_MEM_ZERO( zone, sizeof ( *zone ) );
124    zone->memory = memory;
125
126    if ( FT_NEW_ARRAY( zone->org,      maxPoints   ) ||
127         FT_NEW_ARRAY( zone->cur,      maxPoints   ) ||
128         FT_NEW_ARRAY( zone->orus,     maxPoints   ) ||
129         FT_NEW_ARRAY( zone->tags,     maxPoints   ) ||
130         FT_NEW_ARRAY( zone->contours, maxContours ) )
131    {
132      tt_glyphzone_done( zone );
133    }
134    else
135    {
136      zone->max_points   = maxPoints;
137      zone->max_contours = maxContours;
138    }
139
140    return error;
141  }
142#endif /* TT_USE_BYTECODE_INTERPRETER */
143
144
145  /* Compare the face with a list of well-known `tricky' fonts. */
146  /* This list shall be expanded as we find more of them.       */
147
148  static FT_Bool
149  tt_check_trickyness( FT_String*  name )
150  {
151#define TRICK_NAMES_MAX_CHARACTERS  16
152#define TRICK_NAMES_COUNT 7
153    static const char trick_names[TRICK_NAMES_COUNT][TRICK_NAMES_MAX_CHARACTERS+1] =
154    {
155      "DFKaiSho-SB",     /* dfkaisb.ttf */
156      "DFKaiShu",
157      "DFKai-SB",        /* kaiu.ttf */
158      "HuaTianSongTi?",  /* htst3.ttf */
159      "MingLiU",         /* mingliu.ttf & mingliu.ttc */
160      "PMingLiU",        /* mingliu.ttc */
161      "MingLi43",        /* mingli.ttf */
162    };
163    int  nn;
164
165
166    if ( !name )
167      return FALSE;
168
169    /* Note that we only check the face name at the moment; it might */
170    /* be worth to do more checks for a few special cases.           */
171    for ( nn = 0; nn < TRICK_NAMES_COUNT; nn++ )
172      if ( ft_strstr( name, trick_names[nn] ) )
173        return TRUE;
174
175    return FALSE;
176  }
177
178
179  /*************************************************************************/
180  /*                                                                       */
181  /* <Function>                                                            */
182  /*    tt_face_init                                                       */
183  /*                                                                       */
184  /* <Description>                                                         */
185  /*    Initialize a given TrueType face object.                           */
186  /*                                                                       */
187  /* <Input>                                                               */
188  /*    stream     :: The source font stream.                              */
189  /*                                                                       */
190  /*    face_index :: The index of the font face in the resource.          */
191  /*                                                                       */
192  /*    num_params :: Number of additional generic parameters.  Ignored.   */
193  /*                                                                       */
194  /*    params     :: Additional generic parameters.  Ignored.             */
195  /*                                                                       */
196  /* <InOut>                                                               */
197  /*    face       :: The newly built face object.                         */
198  /*                                                                       */
199  /* <Return>                                                              */
200  /*    FreeType error code.  0 means success.                             */
201  /*                                                                       */
202  FT_LOCAL_DEF( FT_Error )
203  tt_face_init( FT_Stream      stream,
204                FT_Face        ttface,      /* TT_Face */
205                FT_Int         face_index,
206                FT_Int         num_params,
207                FT_Parameter*  params )
208  {
209    FT_Error      error;
210    FT_Library    library;
211    SFNT_Service  sfnt;
212    TT_Face       face = (TT_Face)ttface;
213
214
215    library = ttface->driver->root.library;
216    sfnt    = (SFNT_Service)FT_Get_Module_Interface( library, "sfnt" );
217    if ( !sfnt )
218      goto Bad_Format;
219
220    /* create input stream from resource */
221    if ( FT_STREAM_SEEK( 0 ) )
222      goto Exit;
223
224    /* check that we have a valid TrueType file */
225    error = sfnt->init_face( stream, face, face_index, num_params, params );
226    if ( error )
227      goto Exit;
228
229    /* We must also be able to accept Mac/GX fonts, as well as OT ones. */
230    /* The 0x00020000 tag is completely undocumented; some fonts from   */
231    /* Arphic made for Chinese Windows 3.1 have this.                   */
232    if ( face->format_tag != 0x00010000L &&    /* MS fonts  */
233         face->format_tag != 0x00020000L &&    /* CJK fonts for Win 3.1 */
234         face->format_tag != TTAG_true   )     /* Mac fonts */
235    {
236      FT_TRACE2(( "[not a valid TTF font]\n" ));
237      goto Bad_Format;
238    }
239
240#ifdef TT_USE_BYTECODE_INTERPRETER
241    ttface->face_flags |= FT_FACE_FLAG_HINTER;
242#endif
243
244    /* If we are performing a simple font format check, exit immediately. */
245    if ( face_index < 0 )
246      return TT_Err_Ok;
247
248    /* Load font directory */
249    error = sfnt->load_face( stream, face, face_index, num_params, params );
250    if ( error )
251      goto Exit;
252
253    if ( tt_check_trickyness( ttface->family_name ) )
254      ttface->face_flags |= FT_FACE_FLAG_TRICKY;
255
256    error = tt_face_load_hdmx( face, stream );
257    if ( error )
258      goto Exit;
259
260    if ( FT_IS_SCALABLE( ttface ) )
261    {
262
263#ifdef FT_CONFIG_OPTION_INCREMENTAL
264
265      if ( !ttface->internal->incremental_interface )
266        error = tt_face_load_loca( face, stream );
267      if ( !error )
268        error = tt_face_load_cvt( face, stream );
269      if ( !error )
270        error = tt_face_load_fpgm( face, stream );
271      if ( !error )
272        error = tt_face_load_prep( face, stream );
273
274#else
275
276      if ( !error )
277        error = tt_face_load_loca( face, stream );
278      if ( !error )
279        error = tt_face_load_cvt( face, stream );
280      if ( !error )
281        error = tt_face_load_fpgm( face, stream );
282      if ( !error )
283        error = tt_face_load_prep( face, stream );
284
285#endif
286
287    }
288
289#if defined( TT_CONFIG_OPTION_UNPATENTED_HINTING    ) && \
290    !defined( TT_CONFIG_OPTION_BYTECODE_INTERPRETER )
291
292    {
293      FT_Bool  unpatented_hinting;
294      int      i;
295
296
297      /* Determine whether unpatented hinting is to be used for this face. */
298      unpatented_hinting = FT_BOOL
299        ( library->debug_hooks[FT_DEBUG_HOOK_UNPATENTED_HINTING] != NULL );
300
301      for ( i = 0; i < num_params && !face->unpatented_hinting; i++ )
302        if ( params[i].tag == FT_PARAM_TAG_UNPATENTED_HINTING )
303          unpatented_hinting = TRUE;
304
305      if ( !unpatented_hinting )
306        ttface->internal->ignore_unpatented_hinter = TRUE;
307    }
308
309#endif /* TT_CONFIG_OPTION_UNPATENTED_HINTING &&
310          !TT_CONFIG_OPTION_BYTECODE_INTERPRETER */
311
312    /* initialize standard glyph loading routines */
313    TT_Init_Glyph_Loading( face );
314
315  Exit:
316    return error;
317
318  Bad_Format:
319    error = TT_Err_Unknown_File_Format;
320    goto Exit;
321  }
322
323
324  /*************************************************************************/
325  /*                                                                       */
326  /* <Function>                                                            */
327  /*    tt_face_done                                                       */
328  /*                                                                       */
329  /* <Description>                                                         */
330  /*    Finalize a given face object.                                      */
331  /*                                                                       */
332  /* <Input>                                                               */
333  /*    face :: A pointer to the face object to destroy.                   */
334  /*                                                                       */
335  FT_LOCAL_DEF( void )
336  tt_face_done( FT_Face  ttface )           /* TT_Face */
337  {
338    TT_Face       face = (TT_Face)ttface;
339    FT_Memory     memory;
340    FT_Stream     stream;
341    SFNT_Service  sfnt;
342
343
344    if ( !face )
345      return;
346
347    memory = ttface->memory;
348    stream = ttface->stream;
349    sfnt   = (SFNT_Service)face->sfnt;
350
351    /* for `extended TrueType formats' (i.e. compressed versions) */
352    if ( face->extra.finalizer )
353      face->extra.finalizer( face->extra.data );
354
355    if ( sfnt )
356      sfnt->done_face( face );
357
358    /* freeing the locations table */
359    tt_face_done_loca( face );
360
361    tt_face_free_hdmx( face );
362
363    /* freeing the CVT */
364    FT_FREE( face->cvt );
365    face->cvt_size = 0;
366
367    /* freeing the programs */
368    FT_FRAME_RELEASE( face->font_program );
369    FT_FRAME_RELEASE( face->cvt_program );
370    face->font_program_size = 0;
371    face->cvt_program_size  = 0;
372
373#ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT
374    tt_done_blend( memory, face->blend );
375    face->blend = NULL;
376#endif
377  }
378
379
380  /*************************************************************************/
381  /*                                                                       */
382  /*                           SIZE  FUNCTIONS                             */
383  /*                                                                       */
384  /*************************************************************************/
385
386#ifdef TT_USE_BYTECODE_INTERPRETER
387
388  /*************************************************************************/
389  /*                                                                       */
390  /* <Function>                                                            */
391  /*    tt_size_run_fpgm                                                   */
392  /*                                                                       */
393  /* <Description>                                                         */
394  /*    Run the font program.                                              */
395  /*                                                                       */
396  /* <Input>                                                               */
397  /*    size :: A handle to the size object.                               */
398  /*                                                                       */
399  /* <Return>                                                              */
400  /*    FreeType error code.  0 means success.                             */
401  /*                                                                       */
402  FT_LOCAL_DEF( FT_Error )
403  tt_size_run_fpgm( TT_Size  size )
404  {
405    TT_Face         face = (TT_Face)size->root.face;
406    TT_ExecContext  exec;
407    FT_Error        error;
408
409
410    /* debugging instances have their own context */
411    if ( size->debug )
412      exec = size->context;
413    else
414      exec = ( (TT_Driver)FT_FACE_DRIVER( face ) )->context;
415
416    if ( !exec )
417      return TT_Err_Could_Not_Find_Context;
418
419    TT_Load_Context( exec, face, size );
420
421    exec->callTop   = 0;
422    exec->top       = 0;
423
424    exec->period    = 64;
425    exec->phase     = 0;
426    exec->threshold = 0;
427
428    exec->instruction_trap = FALSE;
429    exec->F_dot_P = 0x10000L;
430
431    {
432      FT_Size_Metrics*  metrics    = &exec->metrics;
433      TT_Size_Metrics*  tt_metrics = &exec->tt_metrics;
434
435
436      metrics->x_ppem   = 0;
437      metrics->y_ppem   = 0;
438      metrics->x_scale  = 0;
439      metrics->y_scale  = 0;
440
441      tt_metrics->ppem  = 0;
442      tt_metrics->scale = 0;
443      tt_metrics->ratio = 0x10000L;
444    }
445
446    /* allow font program execution */
447    TT_Set_CodeRange( exec,
448                      tt_coderange_font,
449                      face->font_program,
450                      face->font_program_size );
451
452    /* disable CVT and glyph programs coderange */
453    TT_Clear_CodeRange( exec, tt_coderange_cvt );
454    TT_Clear_CodeRange( exec, tt_coderange_glyph );
455
456    if ( face->font_program_size > 0 )
457    {
458      error = TT_Goto_CodeRange( exec, tt_coderange_font, 0 );
459
460      if ( !error )
461        error = face->interpreter( exec );
462    }
463    else
464      error = TT_Err_Ok;
465
466    if ( !error )
467      TT_Save_Context( exec, size );
468
469    return error;
470  }
471
472
473  /*************************************************************************/
474  /*                                                                       */
475  /* <Function>                                                            */
476  /*    tt_size_run_prep                                                   */
477  /*                                                                       */
478  /* <Description>                                                         */
479  /*    Run the control value program.                                     */
480  /*                                                                       */
481  /* <Input>                                                               */
482  /*    size :: A handle to the size object.                               */
483  /*                                                                       */
484  /* <Return>                                                              */
485  /*    FreeType error code.  0 means success.                             */
486  /*                                                                       */
487  FT_LOCAL_DEF( FT_Error )
488  tt_size_run_prep( TT_Size  size )
489  {
490    TT_Face         face = (TT_Face)size->root.face;
491    TT_ExecContext  exec;
492    FT_Error        error;
493
494
495    /* debugging instances have their own context */
496    if ( size->debug )
497      exec = size->context;
498    else
499      exec = ( (TT_Driver)FT_FACE_DRIVER( face ) )->context;
500
501    if ( !exec )
502      return TT_Err_Could_Not_Find_Context;
503
504    TT_Load_Context( exec, face, size );
505
506    exec->callTop = 0;
507    exec->top     = 0;
508
509    exec->instruction_trap = FALSE;
510
511    TT_Set_CodeRange( exec,
512                      tt_coderange_cvt,
513                      face->cvt_program,
514                      face->cvt_program_size );
515
516    TT_Clear_CodeRange( exec, tt_coderange_glyph );
517
518    if ( face->cvt_program_size > 0 )
519    {
520      error = TT_Goto_CodeRange( exec, tt_coderange_cvt, 0 );
521
522      if ( !error && !size->debug )
523        error = face->interpreter( exec );
524    }
525    else
526      error = TT_Err_Ok;
527
528    /* save as default graphics state */
529    size->GS = exec->GS;
530
531    TT_Save_Context( exec, size );
532
533    return error;
534  }
535
536#endif /* TT_USE_BYTECODE_INTERPRETER */
537
538
539#ifdef TT_USE_BYTECODE_INTERPRETER
540
541  static void
542  tt_size_done_bytecode( FT_Size  ftsize )
543  {
544    TT_Size    size   = (TT_Size)ftsize;
545    TT_Face    face   = (TT_Face)ftsize->face;
546    FT_Memory  memory = face->root.memory;
547
548
549    if ( size->debug )
550    {
551      /* the debug context must be deleted by the debugger itself */
552      size->context = NULL;
553      size->debug   = FALSE;
554    }
555
556    FT_FREE( size->cvt );
557    size->cvt_size = 0;
558
559    /* free storage area */
560    FT_FREE( size->storage );
561    size->storage_size = 0;
562
563    /* twilight zone */
564    tt_glyphzone_done( &size->twilight );
565
566    FT_FREE( size->function_defs );
567    FT_FREE( size->instruction_defs );
568
569    size->num_function_defs    = 0;
570    size->max_function_defs    = 0;
571    size->num_instruction_defs = 0;
572    size->max_instruction_defs = 0;
573
574    size->max_func = 0;
575    size->max_ins  = 0;
576
577    size->bytecode_ready = 0;
578    size->cvt_ready      = 0;
579  }
580
581
582  /* Initialize bytecode-related fields in the size object.       */
583  /* We do this only if bytecode interpretation is really needed. */
584  static FT_Error
585  tt_size_init_bytecode( FT_Size  ftsize )
586  {
587    FT_Error   error;
588    TT_Size    size = (TT_Size)ftsize;
589    TT_Face    face = (TT_Face)ftsize->face;
590    FT_Memory  memory = face->root.memory;
591    FT_Int     i;
592
593    FT_UShort       n_twilight;
594    TT_MaxProfile*  maxp = &face->max_profile;
595
596
597    size->bytecode_ready = 1;
598    size->cvt_ready      = 0;
599
600    size->max_function_defs    = maxp->maxFunctionDefs;
601    size->max_instruction_defs = maxp->maxInstructionDefs;
602
603    size->num_function_defs    = 0;
604    size->num_instruction_defs = 0;
605
606    size->max_func = 0;
607    size->max_ins  = 0;
608
609    size->cvt_size     = face->cvt_size;
610    size->storage_size = maxp->maxStorage;
611
612    /* Set default metrics */
613    {
614      TT_Size_Metrics*  metrics = &size->ttmetrics;
615
616
617      metrics->rotated   = FALSE;
618      metrics->stretched = FALSE;
619
620      /* set default compensation (all 0) */
621      for ( i = 0; i < 4; i++ )
622        metrics->compensations[i] = 0;
623    }
624
625    /* allocate function defs, instruction defs, cvt, and storage area */
626    if ( FT_NEW_ARRAY( size->function_defs,    size->max_function_defs    ) ||
627         FT_NEW_ARRAY( size->instruction_defs, size->max_instruction_defs ) ||
628         FT_NEW_ARRAY( size->cvt,              size->cvt_size             ) ||
629         FT_NEW_ARRAY( size->storage,          size->storage_size         ) )
630      goto Exit;
631
632    /* reserve twilight zone */
633    n_twilight = maxp->maxTwilightPoints;
634
635    /* there are 4 phantom points (do we need this?) */
636    n_twilight += 4;
637
638    error = tt_glyphzone_new( memory, n_twilight, 0, &size->twilight );
639    if ( error )
640      goto Exit;
641
642    size->twilight.n_points = n_twilight;
643
644    size->GS = tt_default_graphics_state;
645
646    /* set `face->interpreter' according to the debug hook present */
647    {
648      FT_Library  library = face->root.driver->root.library;
649
650
651      face->interpreter = (TT_Interpreter)
652                            library->debug_hooks[FT_DEBUG_HOOK_TRUETYPE];
653      if ( !face->interpreter )
654        face->interpreter = (TT_Interpreter)TT_RunIns;
655    }
656
657    /* Fine, now run the font program! */
658    error = tt_size_run_fpgm( size );
659
660  Exit:
661    if ( error )
662      tt_size_done_bytecode( ftsize );
663
664    return error;
665  }
666
667
668  FT_LOCAL_DEF( FT_Error )
669  tt_size_ready_bytecode( TT_Size  size )
670  {
671    FT_Error  error = TT_Err_Ok;
672
673
674    if ( !size->bytecode_ready )
675    {
676      error = tt_size_init_bytecode( (FT_Size)size );
677      if ( error )
678        goto Exit;
679    }
680
681    /* rescale CVT when needed */
682    if ( !size->cvt_ready )
683    {
684      FT_UInt  i;
685      TT_Face  face = (TT_Face)size->root.face;
686
687
688      /* Scale the cvt values to the new ppem.          */
689      /* We use by default the y ppem to scale the CVT. */
690      for ( i = 0; i < size->cvt_size; i++ )
691        size->cvt[i] = FT_MulFix( face->cvt[i], size->ttmetrics.scale );
692
693      /* all twilight points are originally zero */
694      for ( i = 0; i < (FT_UInt)size->twilight.n_points; i++ )
695      {
696        size->twilight.org[i].x = 0;
697        size->twilight.org[i].y = 0;
698        size->twilight.cur[i].x = 0;
699        size->twilight.cur[i].y = 0;
700      }
701
702      /* clear storage area */
703      for ( i = 0; i < (FT_UInt)size->storage_size; i++ )
704        size->storage[i] = 0;
705
706      size->GS = tt_default_graphics_state;
707
708      error = tt_size_run_prep( size );
709      if ( !error )
710        size->cvt_ready = 1;
711    }
712
713  Exit:
714    return error;
715  }
716
717#endif /* TT_USE_BYTECODE_INTERPRETER */
718
719
720  /*************************************************************************/
721  /*                                                                       */
722  /* <Function>                                                            */
723  /*    tt_size_init                                                       */
724  /*                                                                       */
725  /* <Description>                                                         */
726  /*    Initialize a new TrueType size object.                             */
727  /*                                                                       */
728  /* <InOut>                                                               */
729  /*    size :: A handle to the size object.                               */
730  /*                                                                       */
731  /* <Return>                                                              */
732  /*    FreeType error code.  0 means success.                             */
733  /*                                                                       */
734  FT_LOCAL_DEF( FT_Error )
735  tt_size_init( FT_Size  ttsize )           /* TT_Size */
736  {
737    TT_Size   size  = (TT_Size)ttsize;
738    FT_Error  error = TT_Err_Ok;
739
740#ifdef TT_USE_BYTECODE_INTERPRETER
741    size->bytecode_ready = 0;
742    size->cvt_ready      = 0;
743#endif
744
745    size->ttmetrics.valid = FALSE;
746    size->strike_index    = 0xFFFFFFFFUL;
747
748    return error;
749  }
750
751
752  /*************************************************************************/
753  /*                                                                       */
754  /* <Function>                                                            */
755  /*    tt_size_done                                                       */
756  /*                                                                       */
757  /* <Description>                                                         */
758  /*    The TrueType size object finalizer.                                */
759  /*                                                                       */
760  /* <Input>                                                               */
761  /*    size :: A handle to the target size object.                        */
762  /*                                                                       */
763  FT_LOCAL_DEF( void )
764  tt_size_done( FT_Size  ttsize )           /* TT_Size */
765  {
766    TT_Size  size = (TT_Size)ttsize;
767
768
769#ifdef TT_USE_BYTECODE_INTERPRETER
770    if ( size->bytecode_ready )
771      tt_size_done_bytecode( ttsize );
772#endif
773
774    size->ttmetrics.valid = FALSE;
775  }
776
777
778  /*************************************************************************/
779  /*                                                                       */
780  /* <Function>                                                            */
781  /*    tt_size_reset                                                      */
782  /*                                                                       */
783  /* <Description>                                                         */
784  /*    Reset a TrueType size when resolutions and character dimensions    */
785  /*    have been changed.                                                 */
786  /*                                                                       */
787  /* <Input>                                                               */
788  /*    size :: A handle to the target size object.                        */
789  /*                                                                       */
790  FT_LOCAL_DEF( FT_Error )
791  tt_size_reset( TT_Size  size )
792  {
793    TT_Face           face;
794    FT_Error          error = TT_Err_Ok;
795    FT_Size_Metrics*  metrics;
796
797
798    size->ttmetrics.valid = FALSE;
799
800    face = (TT_Face)size->root.face;
801
802    metrics = &size->metrics;
803
804    /* copy the result from base layer */
805    *metrics = size->root.metrics;
806
807    if ( metrics->x_ppem < 1 || metrics->y_ppem < 1 )
808      return TT_Err_Invalid_PPem;
809
810    /* This bit flag, if set, indicates that the ppems must be       */
811    /* rounded to integers.  Nearly all TrueType fonts have this bit */
812    /* set, as hinting won't work really well otherwise.             */
813    /*                                                               */
814    if ( face->header.Flags & 8 )
815    {
816      metrics->x_scale = FT_DivFix( metrics->x_ppem << 6,
817                                    face->root.units_per_EM );
818      metrics->y_scale = FT_DivFix( metrics->y_ppem << 6,
819                                    face->root.units_per_EM );
820
821      metrics->ascender =
822        FT_PIX_ROUND( FT_MulFix( face->root.ascender, metrics->y_scale ) );
823      metrics->descender =
824        FT_PIX_ROUND( FT_MulFix( face->root.descender, metrics->y_scale ) );
825      metrics->height =
826        FT_PIX_ROUND( FT_MulFix( face->root.height, metrics->y_scale ) );
827      metrics->max_advance =
828        FT_PIX_ROUND( FT_MulFix( face->root.max_advance_width,
829                                 metrics->x_scale ) );
830    }
831
832    /* compute new transformation */
833    if ( metrics->x_ppem >= metrics->y_ppem )
834    {
835      size->ttmetrics.scale   = metrics->x_scale;
836      size->ttmetrics.ppem    = metrics->x_ppem;
837      size->ttmetrics.x_ratio = 0x10000L;
838      size->ttmetrics.y_ratio = FT_MulDiv( metrics->y_ppem,
839                                           0x10000L,
840                                           metrics->x_ppem );
841    }
842    else
843    {
844      size->ttmetrics.scale   = metrics->y_scale;
845      size->ttmetrics.ppem    = metrics->y_ppem;
846      size->ttmetrics.x_ratio = FT_MulDiv( metrics->x_ppem,
847                                           0x10000L,
848                                           metrics->y_ppem );
849      size->ttmetrics.y_ratio = 0x10000L;
850    }
851
852#ifdef TT_USE_BYTECODE_INTERPRETER
853    size->cvt_ready = 0;
854#endif /* TT_USE_BYTECODE_INTERPRETER */
855
856    if ( !error )
857      size->ttmetrics.valid = TRUE;
858
859    return error;
860  }
861
862
863  /*************************************************************************/
864  /*                                                                       */
865  /* <Function>                                                            */
866  /*    tt_driver_init                                                     */
867  /*                                                                       */
868  /* <Description>                                                         */
869  /*    Initialize a given TrueType driver object.                         */
870  /*                                                                       */
871  /* <Input>                                                               */
872  /*    driver :: A handle to the target driver object.                    */
873  /*                                                                       */
874  /* <Return>                                                              */
875  /*    FreeType error code.  0 means success.                             */
876  /*                                                                       */
877  FT_LOCAL_DEF( FT_Error )
878  tt_driver_init( FT_Module  ttdriver )     /* TT_Driver */
879  {
880
881#ifdef TT_USE_BYTECODE_INTERPRETER
882
883    TT_Driver  driver = (TT_Driver)ttdriver;
884
885
886    if ( !TT_New_Context( driver ) )
887      return TT_Err_Could_Not_Find_Context;
888
889#else
890
891    FT_UNUSED( ttdriver );
892
893#endif
894
895    return TT_Err_Ok;
896  }
897
898
899  /*************************************************************************/
900  /*                                                                       */
901  /* <Function>                                                            */
902  /*    tt_driver_done                                                     */
903  /*                                                                       */
904  /* <Description>                                                         */
905  /*    Finalize a given TrueType driver.                                  */
906  /*                                                                       */
907  /* <Input>                                                               */
908  /*    driver :: A handle to the target TrueType driver.                  */
909  /*                                                                       */
910  FT_LOCAL_DEF( void )
911  tt_driver_done( FT_Module  ttdriver )     /* TT_Driver */
912  {
913#ifdef TT_USE_BYTECODE_INTERPRETER
914    TT_Driver  driver = (TT_Driver)ttdriver;
915
916
917    /* destroy the execution context */
918    if ( driver->context )
919    {
920      TT_Done_Context( driver->context );
921      driver->context = NULL;
922    }
923#else
924    FT_UNUSED( ttdriver );
925#endif
926
927  }
928
929
930  /*************************************************************************/
931  /*                                                                       */
932  /* <Function>                                                            */
933  /*    tt_slot_init                                                       */
934  /*                                                                       */
935  /* <Description>                                                         */
936  /*    Initialize a new slot object.                                      */
937  /*                                                                       */
938  /* <InOut>                                                               */
939  /*    slot :: A handle to the slot object.                               */
940  /*                                                                       */
941  /* <Return>                                                              */
942  /*    FreeType error code.  0 means success.                             */
943  /*                                                                       */
944  FT_LOCAL_DEF( FT_Error )
945  tt_slot_init( FT_GlyphSlot  slot )
946  {
947    return FT_GlyphLoader_CreateExtra( slot->internal->loader );
948  }
949
950
951/* END */