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/src/freetype/src/cid/cidgload.c

https://bitbucket.org/cabalistic/ogredeps/
C | 442 lines | 266 code | 102 blank | 74 comment | 33 complexity | dbe78215396e65a7e4601038fef225f9 MD5 | raw file
  1/***************************************************************************/
  2/*                                                                         */
  3/*  cidgload.c                                                             */
  4/*                                                                         */
  5/*    CID-keyed Type1 Glyph Loader (body).                                 */
  6/*                                                                         */
  7/*  Copyright 1996-2001, 2002, 2003, 2004, 2005, 2006, 2007, 2009, 2010 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 "cidload.h"
 21#include "cidgload.h"
 22#include FT_INTERNAL_DEBUG_H
 23#include FT_INTERNAL_STREAM_H
 24#include FT_OUTLINE_H
 25#include FT_INTERNAL_CALC_H
 26
 27#include "ciderrs.h"
 28
 29
 30  /*************************************************************************/
 31  /*                                                                       */
 32  /* The macro FT_COMPONENT is used in trace mode.  It is an implicit      */
 33  /* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log  */
 34  /* messages during execution.                                            */
 35  /*                                                                       */
 36#undef  FT_COMPONENT
 37#define FT_COMPONENT  trace_cidgload
 38
 39
 40  FT_CALLBACK_DEF( FT_Error )
 41  cid_load_glyph( T1_Decoder  decoder,
 42                  FT_UInt     glyph_index )
 43  {
 44    CID_Face       face = (CID_Face)decoder->builder.face;
 45    CID_FaceInfo   cid  = &face->cid;
 46    FT_Byte*       p;
 47    FT_UInt        fd_select;
 48    FT_Stream      stream       = face->cid_stream;
 49    FT_Error       error        = CID_Err_Ok;
 50    FT_Byte*       charstring   = 0;
 51    FT_Memory      memory       = face->root.memory;
 52    FT_ULong       glyph_length = 0;
 53    PSAux_Service  psaux        = (PSAux_Service)face->psaux;
 54
 55#ifdef FT_CONFIG_OPTION_INCREMENTAL
 56    FT_Incremental_InterfaceRec *inc =
 57                                  face->root.internal->incremental_interface;
 58#endif
 59
 60
 61    FT_TRACE4(( "cid_load_glyph: glyph index %d\n", glyph_index ));
 62
 63#ifdef FT_CONFIG_OPTION_INCREMENTAL
 64
 65    /* For incremental fonts get the character data using */
 66    /* the callback function.                             */
 67    if ( inc )
 68    {
 69      FT_Data  glyph_data;
 70
 71
 72      error = inc->funcs->get_glyph_data( inc->object,
 73                                          glyph_index, &glyph_data );
 74      if ( error )
 75        goto Exit;
 76
 77      p         = (FT_Byte*)glyph_data.pointer;
 78      fd_select = (FT_UInt)cid_get_offset( &p, (FT_Byte)cid->fd_bytes );
 79
 80      if ( glyph_data.length != 0 )
 81      {
 82        glyph_length = glyph_data.length - cid->fd_bytes;
 83        (void)FT_ALLOC( charstring, glyph_length );
 84        if ( !error )
 85          ft_memcpy( charstring, glyph_data.pointer + cid->fd_bytes,
 86                     glyph_length );
 87      }
 88
 89      inc->funcs->free_glyph_data( inc->object, &glyph_data );
 90
 91      if ( error )
 92        goto Exit;
 93    }
 94
 95    else
 96
 97#endif /* FT_CONFIG_OPTION_INCREMENTAL */
 98
 99    /* For ordinary fonts read the CID font dictionary index */
100    /* and charstring offset from the CIDMap.                */
101    {
102      FT_UInt   entry_len = cid->fd_bytes + cid->gd_bytes;
103      FT_ULong  off1;
104
105
106      if ( FT_STREAM_SEEK( cid->data_offset + cid->cidmap_offset +
107                           glyph_index * entry_len )               ||
108           FT_FRAME_ENTER( 2 * entry_len )                         )
109        goto Exit;
110
111      p            = (FT_Byte*)stream->cursor;
112      fd_select    = (FT_UInt) cid_get_offset( &p, (FT_Byte)cid->fd_bytes );
113      off1         = (FT_ULong)cid_get_offset( &p, (FT_Byte)cid->gd_bytes );
114      p           += cid->fd_bytes;
115      glyph_length = cid_get_offset( &p, (FT_Byte)cid->gd_bytes ) - off1;
116      FT_FRAME_EXIT();
117
118      if ( fd_select >= (FT_UInt)cid->num_dicts )
119      {
120        error = CID_Err_Invalid_Offset;
121        goto Exit;
122      }
123      if ( glyph_length == 0 )
124        goto Exit;
125      if ( FT_ALLOC( charstring, glyph_length ) )
126        goto Exit;
127      if ( FT_STREAM_READ_AT( cid->data_offset + off1,
128                              charstring, glyph_length ) )
129        goto Exit;
130    }
131
132    /* Now set up the subrs array and parse the charstrings. */
133    {
134      CID_FaceDict  dict;
135      CID_Subrs     cid_subrs = face->subrs + fd_select;
136      FT_Int        cs_offset;
137
138
139      /* Set up subrs */
140      decoder->num_subrs = cid_subrs->num_subrs;
141      decoder->subrs     = cid_subrs->code;
142      decoder->subrs_len = 0;
143
144      /* Set up font matrix */
145      dict                 = cid->font_dicts + fd_select;
146
147      decoder->font_matrix = dict->font_matrix;
148      decoder->font_offset = dict->font_offset;
149      decoder->lenIV       = dict->private_dict.lenIV;
150
151      /* Decode the charstring. */
152
153      /* Adjustment for seed bytes. */
154      cs_offset = ( decoder->lenIV >= 0 ? decoder->lenIV : 0 );
155
156      /* Decrypt only if lenIV >= 0. */
157      if ( decoder->lenIV >= 0 )
158        psaux->t1_decrypt( charstring, glyph_length, 4330 );
159
160      error = decoder->funcs.parse_charstrings(
161                decoder, charstring + cs_offset,
162                (FT_Int)glyph_length - cs_offset );
163    }
164
165    FT_FREE( charstring );
166
167#ifdef FT_CONFIG_OPTION_INCREMENTAL
168
169    /* Incremental fonts can optionally override the metrics. */
170    if ( !error && inc && inc->funcs->get_glyph_metrics )
171    {
172      FT_Incremental_MetricsRec  metrics;
173
174
175      metrics.bearing_x = FIXED_TO_INT( decoder->builder.left_bearing.x );
176      metrics.bearing_y = 0;
177      metrics.advance   = FIXED_TO_INT( decoder->builder.advance.x );
178      metrics.advance_v = FIXED_TO_INT( decoder->builder.advance.y );
179
180      error = inc->funcs->get_glyph_metrics( inc->object,
181                                             glyph_index, FALSE, &metrics );
182
183      decoder->builder.left_bearing.x = INT_TO_FIXED( metrics.bearing_x );
184      decoder->builder.advance.x      = INT_TO_FIXED( metrics.advance );
185      decoder->builder.advance.y      = INT_TO_FIXED( metrics.advance_v );
186    }
187
188#endif /* FT_CONFIG_OPTION_INCREMENTAL */
189
190  Exit:
191    return error;
192  }
193
194
195#if 0
196
197
198  /*************************************************************************/
199  /*************************************************************************/
200  /*************************************************************************/
201  /**********                                                      *********/
202  /**********                                                      *********/
203  /**********            COMPUTE THE MAXIMUM ADVANCE WIDTH         *********/
204  /**********                                                      *********/
205  /**********    The following code is in charge of computing      *********/
206  /**********    the maximum advance width of the font.  It        *********/
207  /**********    quickly processes each glyph charstring to        *********/
208  /**********    extract the value from either a `sbw' or `seac'   *********/
209  /**********    operator.                                         *********/
210  /**********                                                      *********/
211  /*************************************************************************/
212  /*************************************************************************/
213  /*************************************************************************/
214
215
216  FT_LOCAL_DEF( FT_Error )
217  cid_face_compute_max_advance( CID_Face  face,
218                                FT_Int*   max_advance )
219  {
220    FT_Error       error;
221    T1_DecoderRec  decoder;
222    FT_Int         glyph_index;
223
224    PSAux_Service  psaux = (PSAux_Service)face->psaux;
225
226
227    *max_advance = 0;
228
229    /* Initialize load decoder */
230    error = psaux->t1_decoder_funcs->init( &decoder,
231                                           (FT_Face)face,
232                                           0, /* size       */
233                                           0, /* glyph slot */
234                                           0, /* glyph names! XXX */
235                                           0, /* blend == 0 */
236                                           0, /* hinting == 0 */
237                                           cid_load_glyph );
238    if ( error )
239      return error;
240
241    /* TODO: initialize decoder.len_buildchar and decoder.buildchar */
242    /*       if we ever support CID-keyed multiple master fonts     */
243
244    decoder.builder.metrics_only = 1;
245    decoder.builder.load_points  = 0;
246
247    /* for each glyph, parse the glyph charstring and extract */
248    /* the advance width                                      */
249    for ( glyph_index = 0; glyph_index < face->root.num_glyphs;
250          glyph_index++ )
251    {
252      /* now get load the unscaled outline */
253      error = cid_load_glyph( &decoder, glyph_index );
254      /* ignore the error if one occurred - skip to next glyph */
255    }
256
257    *max_advance = FIXED_TO_INT( decoder.builder.advance.x );
258
259    psaux->t1_decoder_funcs->done( &decoder );
260
261    return CID_Err_Ok;
262  }
263
264
265#endif /* 0 */
266
267
268  FT_LOCAL_DEF( FT_Error )
269  cid_slot_load_glyph( FT_GlyphSlot  cidglyph,      /* CID_GlyphSlot */
270                       FT_Size       cidsize,       /* CID_Size      */
271                       FT_UInt       glyph_index,
272                       FT_Int32      load_flags )
273  {
274    CID_GlyphSlot  glyph = (CID_GlyphSlot)cidglyph;
275    FT_Error       error;
276    T1_DecoderRec  decoder;
277    CID_Face       face = (CID_Face)cidglyph->face;
278    FT_Bool        hinting;
279
280    PSAux_Service  psaux = (PSAux_Service)face->psaux;
281    FT_Matrix      font_matrix;
282    FT_Vector      font_offset;
283
284
285    if ( glyph_index >= (FT_UInt)face->root.num_glyphs )
286    {
287      error = CID_Err_Invalid_Argument;
288      goto Exit;
289    }
290
291    if ( load_flags & FT_LOAD_NO_RECURSE )
292      load_flags |= FT_LOAD_NO_SCALE | FT_LOAD_NO_HINTING;
293
294    glyph->x_scale = cidsize->metrics.x_scale;
295    glyph->y_scale = cidsize->metrics.y_scale;
296
297    cidglyph->outline.n_points   = 0;
298    cidglyph->outline.n_contours = 0;
299
300    hinting = FT_BOOL( ( load_flags & FT_LOAD_NO_SCALE   ) == 0 &&
301                       ( load_flags & FT_LOAD_NO_HINTING ) == 0 );
302
303    cidglyph->format = FT_GLYPH_FORMAT_OUTLINE;
304
305    error = psaux->t1_decoder_funcs->init( &decoder,
306                                           cidglyph->face,
307                                           cidsize,
308                                           cidglyph,
309                                           0, /* glyph names -- XXX */
310                                           0, /* blend == 0 */
311                                           hinting,
312                                           FT_LOAD_TARGET_MODE( load_flags ),
313                                           cid_load_glyph );
314    if ( error )
315      goto Exit;
316
317    /* TODO: initialize decoder.len_buildchar and decoder.buildchar */
318    /*       if we ever support CID-keyed multiple master fonts     */
319
320    /* set up the decoder */
321    decoder.builder.no_recurse = FT_BOOL(
322      ( ( load_flags & FT_LOAD_NO_RECURSE ) != 0 ) );
323
324    error = cid_load_glyph( &decoder, glyph_index );
325    if ( error )
326      goto Exit;
327
328    font_matrix = decoder.font_matrix;
329    font_offset = decoder.font_offset;
330
331    /* save new glyph tables */
332    psaux->t1_decoder_funcs->done( &decoder );
333
334    /* now set the metrics -- this is rather simple, as    */
335    /* the left side bearing is the xMin, and the top side */
336    /* bearing the yMax                                    */
337    cidglyph->outline.flags &= FT_OUTLINE_OWNER;
338    cidglyph->outline.flags |= FT_OUTLINE_REVERSE_FILL;
339
340    /* for composite glyphs, return only left side bearing and */
341    /* advance width                                           */
342    if ( load_flags & FT_LOAD_NO_RECURSE )
343    {
344      FT_Slot_Internal  internal = cidglyph->internal;
345
346
347      cidglyph->metrics.horiBearingX =
348        FIXED_TO_INT( decoder.builder.left_bearing.x );
349      cidglyph->metrics.horiAdvance =
350        FIXED_TO_INT( decoder.builder.advance.x );
351
352      internal->glyph_matrix      = font_matrix;
353      internal->glyph_delta       = font_offset;
354      internal->glyph_transformed = 1;
355    }
356    else
357    {
358      FT_BBox            cbox;
359      FT_Glyph_Metrics*  metrics = &cidglyph->metrics;
360      FT_Vector          advance;
361
362
363      /* copy the _unscaled_ advance width */
364      metrics->horiAdvance =
365        FIXED_TO_INT( decoder.builder.advance.x );
366      cidglyph->linearHoriAdvance =
367        FIXED_TO_INT( decoder.builder.advance.x );
368      cidglyph->internal->glyph_transformed = 0;
369
370      /* make up vertical ones */
371      metrics->vertAdvance        = ( face->cid.font_bbox.yMax -
372                                      face->cid.font_bbox.yMin ) >> 16;
373      cidglyph->linearVertAdvance = metrics->vertAdvance;
374
375      cidglyph->format            = FT_GLYPH_FORMAT_OUTLINE;
376
377      if ( cidsize->metrics.y_ppem < 24 )
378        cidglyph->outline.flags |= FT_OUTLINE_HIGH_PRECISION;
379
380      /* apply the font matrix */
381      FT_Outline_Transform( &cidglyph->outline, &font_matrix );
382
383      FT_Outline_Translate( &cidglyph->outline,
384                            font_offset.x,
385                            font_offset.y );
386
387      advance.x = metrics->horiAdvance;
388      advance.y = 0;
389      FT_Vector_Transform( &advance, &font_matrix );
390      metrics->horiAdvance = advance.x + font_offset.x;
391
392      advance.x = 0;
393      advance.y = metrics->vertAdvance;
394      FT_Vector_Transform( &advance, &font_matrix );
395      metrics->vertAdvance = advance.y + font_offset.y;
396
397      if ( ( load_flags & FT_LOAD_NO_SCALE ) == 0 )
398      {
399        /* scale the outline and the metrics */
400        FT_Int       n;
401        FT_Outline*  cur = decoder.builder.base;
402        FT_Vector*   vec = cur->points;
403        FT_Fixed     x_scale = glyph->x_scale;
404        FT_Fixed     y_scale = glyph->y_scale;
405
406
407        /* First of all, scale the points */
408        if ( !hinting || !decoder.builder.hints_funcs )
409          for ( n = cur->n_points; n > 0; n--, vec++ )
410          {
411            vec->x = FT_MulFix( vec->x, x_scale );
412            vec->y = FT_MulFix( vec->y, y_scale );
413          }
414
415        /* Then scale the metrics */
416        metrics->horiAdvance = FT_MulFix( metrics->horiAdvance, x_scale );
417        metrics->vertAdvance = FT_MulFix( metrics->vertAdvance, y_scale );
418      }
419
420      /* compute the other metrics */
421      FT_Outline_Get_CBox( &cidglyph->outline, &cbox );
422
423      metrics->width  = cbox.xMax - cbox.xMin;
424      metrics->height = cbox.yMax - cbox.yMin;
425
426      metrics->horiBearingX = cbox.xMin;
427      metrics->horiBearingY = cbox.yMax;
428
429      if ( load_flags & FT_LOAD_VERTICAL_LAYOUT )
430      {
431        /* make up vertical ones */
432        ft_synthesize_vertical_metrics( metrics,
433                                        metrics->vertAdvance );
434      }
435    }
436
437  Exit:
438    return error;
439  }
440
441
442/* END */