XFA: merge patch from CL 817753002
[pdfium.git] / core / src / fxge / fx_freetype / fxft2.5.01 / src / cid / cidgload.c
1 /***************************************************************************/
2 /*                                                                         */
3 /*  cidgload.c                                                             */
4 /*                                                                         */
5 /*    CID-keyed Type1 Glyph Loader (body).                                 */
6 /*                                                                         */
7 /*  Copyright 1996-2007, 2009, 2010, 2013 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 "../../include/ft2build.h"
20 #include "cidload.h"
21 #include "cidgload.h"
22 #include "../../include/freetype/internal/ftdebug.h"
23 #include "../../include/freetype/internal/ftstream.h"
24 #include "../../include/freetype/ftoutln.h"
25 #include "../../include/freetype/internal/ftcalc.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        = FT_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 = 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_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 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       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 */