1/***************************************************************************/
2/*                                                                         */
3/*  cidgload.c                                                             */
4/*                                                                         */
5/*    CID-keyed Type1 Glyph Loader (body).                                 */
6/*                                                                         */
7/*  Copyright 1996-2015 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_ULong       fd_select;
48    FT_Stream      stream       = face->cid_stream;
49    FT_Error       error        = FT_Err_Ok;
50    FT_Byte*       charstring   = NULL;
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_TRACE1(( "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 = cid_get_offset( &p, (FT_Byte)cid->fd_bytes );
79
80      if ( glyph_data.length != 0 )
81      {
82        glyph_length = (FT_ULong)( 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 = (FT_UInt)( 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    = cid_get_offset( &p, (FT_Byte)cid->fd_bytes );
113      off1         = 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_ULong)cid->num_dicts )
119      {
120        error = FT_THROW( 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_UInt       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 ? (FT_UInt)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                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 FT_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 = FT_THROW( 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
361
362      /* copy the _unscaled_ advance width */
363      metrics->horiAdvance =
364        FIXED_TO_INT( decoder.builder.advance.x );
365      cidglyph->linearHoriAdvance =
366        FIXED_TO_INT( decoder.builder.advance.x );
367      cidglyph->internal->glyph_transformed = 0;
368
369      /* make up vertical ones */
370      metrics->vertAdvance        = ( face->cid.font_bbox.yMax -
371                                      face->cid.font_bbox.yMin ) >> 16;
372      cidglyph->linearVertAdvance = metrics->vertAdvance;
373
374      cidglyph->format            = FT_GLYPH_FORMAT_OUTLINE;
375
376      if ( cidsize->metrics.y_ppem < 24 )
377        cidglyph->outline.flags |= FT_OUTLINE_HIGH_PRECISION;
378
379      /* apply the font matrix, if any */
380      if ( font_matrix.xx != 0x10000L || font_matrix.yy != 0x10000L ||
381           font_matrix.xy != 0        || font_matrix.yx != 0        )
382      {
383        FT_Outline_Transform( &cidglyph->outline, &font_matrix );
384
385        metrics->horiAdvance = FT_MulFix( metrics->horiAdvance,
386                                          font_matrix.xx );
387        metrics->vertAdvance = FT_MulFix( metrics->vertAdvance,
388                                          font_matrix.yy );
389      }
390
391      if ( font_offset.x || font_offset.y )
392      {
393        FT_Outline_Translate( &cidglyph->outline,
394                              font_offset.x,
395                              font_offset.y );
396
397        metrics->horiAdvance += font_offset.x;
398        metrics->vertAdvance += font_offset.y;
399      }
400
401      if ( ( load_flags & FT_LOAD_NO_SCALE ) == 0 )
402      {
403        /* scale the outline and the metrics */
404        FT_Int       n;
405        FT_Outline*  cur = decoder.builder.base;
406        FT_Vector*   vec = cur->points;
407        FT_Fixed     x_scale = glyph->x_scale;
408        FT_Fixed     y_scale = glyph->y_scale;
409
410
411        /* First of all, scale the points */
412        if ( !hinting || !decoder.builder.hints_funcs )
413          for ( n = cur->n_points; n > 0; n--, vec++ )
414          {
415            vec->x = FT_MulFix( vec->x, x_scale );
416            vec->y = FT_MulFix( vec->y, y_scale );
417          }
418
419        /* Then scale the metrics */
420        metrics->horiAdvance = FT_MulFix( metrics->horiAdvance, x_scale );
421        metrics->vertAdvance = FT_MulFix( metrics->vertAdvance, y_scale );
422      }
423
424      /* compute the other metrics */
425      FT_Outline_Get_CBox( &cidglyph->outline, &cbox );
426
427      metrics->width  = cbox.xMax - cbox.xMin;
428      metrics->height = cbox.yMax - cbox.yMin;
429
430      metrics->horiBearingX = cbox.xMin;
431      metrics->horiBearingY = cbox.yMax;
432
433      if ( load_flags & FT_LOAD_VERTICAL_LAYOUT )
434      {
435        /* make up vertical ones */
436        ft_synthesize_vertical_metrics( metrics,
437                                        metrics->vertAdvance );
438      }
439    }
440
441  Exit:
442    return error;
443  }
444
445
446/* END */
447