d06e161db96726c447ab9e6a20ff2cbb02e438a8
[pdfium.git] / core / src / fxge / fx_freetype / fxft2.5.01 / src / type1 / t1gload.c
1 /***************************************************************************/
2 /*                                                                         */
3 /*  t1gload.c                                                              */
4 /*                                                                         */
5 /*    Type 1 Glyph Loader (body).                                          */
6 /*                                                                         */
7 /*  Copyright 1996-2006, 2008-2010, 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 "t1gload.h"
21 #include "../../include/freetype/internal/ftcalc.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/psaux.h"
26
27 #include "t1errors.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_t1gload
38
39
40   /*************************************************************************/
41   /*************************************************************************/
42   /*************************************************************************/
43   /**********                                                      *********/
44   /**********            COMPUTE THE MAXIMUM ADVANCE WIDTH         *********/
45   /**********                                                      *********/
46   /**********    The following code is in charge of computing      *********/
47   /**********    the maximum advance width of the font.  It        *********/
48   /**********    quickly processes each glyph charstring to        *********/
49   /**********    extract the value from either a `sbw' or `seac'   *********/
50   /**********    operator.                                         *********/
51   /**********                                                      *********/
52   /*************************************************************************/
53   /*************************************************************************/
54   /*************************************************************************/
55
56
57   FT_LOCAL_DEF( FT_Error )
58   T1_Parse_Glyph_And_Get_Char_String( T1_Decoder  decoder,
59                                       FT_UInt     glyph_index,
60                                       FT_Data*    char_string )
61   {
62     T1_Face   face  = (T1_Face)decoder->builder.face;
63     T1_Font   type1 = &face->type1;
64     FT_Error  error = FT_Err_Ok;
65
66 #ifdef FT_CONFIG_OPTION_INCREMENTAL
67     FT_Incremental_InterfaceRec *inc =
68                       face->root.internal->incremental_interface;
69 #endif
70
71
72     decoder->font_matrix = type1->font_matrix;
73     decoder->font_offset = type1->font_offset;
74
75 #ifdef FT_CONFIG_OPTION_INCREMENTAL
76
77     /* For incremental fonts get the character data using the */
78     /* callback function.                                     */
79     if ( inc )
80       error = inc->funcs->get_glyph_data( inc->object,
81                                           glyph_index, char_string );
82     else
83
84 #endif /* FT_CONFIG_OPTION_INCREMENTAL */
85
86     /* For ordinary fonts get the character data stored in the face record. */
87     {
88       char_string->pointer = type1->charstrings[glyph_index];
89       char_string->length  = (FT_Int)type1->charstrings_len[glyph_index];
90     }
91
92     if ( !error )
93       error = decoder->funcs.parse_charstrings(
94                 decoder, (FT_Byte*)char_string->pointer,
95                 char_string->length );
96
97 #ifdef FT_CONFIG_OPTION_INCREMENTAL
98
99     /* Incremental fonts can optionally override the metrics. */
100     if ( !error && inc && inc->funcs->get_glyph_metrics )
101     {
102       FT_Incremental_MetricsRec  metrics;
103
104
105       metrics.bearing_x = FIXED_TO_INT( decoder->builder.left_bearing.x );
106       metrics.bearing_y = 0;
107       metrics.advance   = FIXED_TO_INT( decoder->builder.advance.x );
108       metrics.advance_v = FIXED_TO_INT( decoder->builder.advance.y );
109
110       error = inc->funcs->get_glyph_metrics( inc->object,
111                                              glyph_index, FALSE, &metrics );
112
113       decoder->builder.left_bearing.x = INT_TO_FIXED( metrics.bearing_x );
114       decoder->builder.advance.x      = INT_TO_FIXED( metrics.advance );
115       decoder->builder.advance.y      = INT_TO_FIXED( metrics.advance_v );
116     }
117
118 #endif /* FT_CONFIG_OPTION_INCREMENTAL */
119
120     return error;
121   }
122
123
124   FT_CALLBACK_DEF( FT_Error )
125   T1_Parse_Glyph( T1_Decoder  decoder,
126                   FT_UInt     glyph_index )
127   {
128     FT_Data   glyph_data;
129     FT_Error  error = T1_Parse_Glyph_And_Get_Char_String(
130                         decoder, glyph_index, &glyph_data );
131
132
133 #ifdef FT_CONFIG_OPTION_INCREMENTAL
134
135     if ( !error )
136     {
137       T1_Face  face = (T1_Face)decoder->builder.face;
138
139
140       if ( face->root.internal->incremental_interface )
141         face->root.internal->incremental_interface->funcs->free_glyph_data(
142           face->root.internal->incremental_interface->object,
143           &glyph_data );
144     }
145
146 #endif /* FT_CONFIG_OPTION_INCREMENTAL */
147
148     return error;
149   }
150
151
152   FT_LOCAL_DEF( FT_Error )
153   T1_Compute_Max_Advance( T1_Face  face,
154                           FT_Pos*  max_advance )
155   {
156     FT_Error       error;
157     T1_DecoderRec  decoder;
158     FT_Int         glyph_index;
159     T1_Font        type1 = &face->type1;
160     PSAux_Service  psaux = (PSAux_Service)face->psaux;
161
162
163     FT_ASSERT( ( face->len_buildchar == 0 ) == ( face->buildchar == NULL ) );
164
165     *max_advance = 0;
166
167     /* initialize load decoder */
168     error = psaux->t1_decoder_funcs->init( &decoder,
169                                            (FT_Face)face,
170                                            0, /* size       */
171                                            0, /* glyph slot */
172                                            (FT_Byte**)type1->glyph_names,
173                                            face->blend,
174                                            0,
175                                            FT_RENDER_MODE_NORMAL,
176                                            T1_Parse_Glyph );
177     if ( error )
178       return error;
179
180     decoder.builder.metrics_only = 1;
181     decoder.builder.load_points  = 0;
182
183     decoder.num_subrs     = type1->num_subrs;
184     decoder.subrs         = type1->subrs;
185     decoder.subrs_len     = type1->subrs_len;
186
187     decoder.buildchar     = face->buildchar;
188     decoder.len_buildchar = face->len_buildchar;
189
190     *max_advance = 0;
191
192     /* for each glyph, parse the glyph charstring and extract */
193     /* the advance width                                      */
194     for ( glyph_index = 0; glyph_index < type1->num_glyphs; glyph_index++ )
195     {
196       /* now get load the unscaled outline */
197       error = T1_Parse_Glyph( &decoder, glyph_index );
198       if ( glyph_index == 0 || decoder.builder.advance.x > *max_advance )
199         *max_advance = decoder.builder.advance.x;
200
201       /* ignore the error if one occurred - skip to next glyph */
202     }
203
204     psaux->t1_decoder_funcs->done( &decoder );
205
206     return FT_Err_Ok;
207   }
208
209
210   FT_LOCAL_DEF( FT_Error )
211   T1_Get_Advances( FT_Face    t1face,        /* T1_Face */
212                    FT_UInt    first,
213                    FT_UInt    count,
214                    FT_Int32   load_flags,
215                    FT_Fixed*  advances )
216   {
217     T1_Face        face  = (T1_Face)t1face;
218     T1_DecoderRec  decoder;
219     T1_Font        type1 = &face->type1;
220     PSAux_Service  psaux = (PSAux_Service)face->psaux;
221     FT_UInt        nn;
222     FT_Error       error;
223
224
225     if ( load_flags & FT_LOAD_VERTICAL_LAYOUT )
226     {
227       for ( nn = 0; nn < count; nn++ )
228         advances[nn] = 0;
229
230       return FT_Err_Ok;
231     }
232
233     error = psaux->t1_decoder_funcs->init( &decoder,
234                                            (FT_Face)face,
235                                            0, /* size       */
236                                            0, /* glyph slot */
237                                            (FT_Byte**)type1->glyph_names,
238                                            face->blend,
239                                            0,
240                                            FT_RENDER_MODE_NORMAL,
241                                            T1_Parse_Glyph );
242     if ( error )
243       return error;
244
245     decoder.builder.metrics_only = 1;
246     decoder.builder.load_points  = 0;
247
248     decoder.num_subrs = type1->num_subrs;
249     decoder.subrs     = type1->subrs;
250     decoder.subrs_len = type1->subrs_len;
251
252     decoder.buildchar     = face->buildchar;
253     decoder.len_buildchar = face->len_buildchar;
254
255     for ( nn = 0; nn < count; nn++ )
256     {
257       error = T1_Parse_Glyph( &decoder, first + nn );
258       if ( !error )
259         advances[nn] = FIXED_TO_INT( decoder.builder.advance.x );
260       else
261         advances[nn] = 0;
262     }
263
264     return FT_Err_Ok;
265   }
266
267
268   FT_LOCAL_DEF( FT_Error )
269   T1_Load_Glyph( FT_GlyphSlot  t1glyph,          /* T1_GlyphSlot */
270                  FT_Size       t1size,           /* T1_Size      */
271                  FT_UInt       glyph_index,
272                  FT_Int32      load_flags )
273   {
274     T1_GlyphSlot            glyph = (T1_GlyphSlot)t1glyph;
275     FT_Error                error;
276     T1_DecoderRec           decoder;
277     T1_Face                 face = (T1_Face)t1glyph->face;
278     FT_Bool                 hinting;
279     T1_Font                 type1         = &face->type1;
280     PSAux_Service           psaux         = (PSAux_Service)face->psaux;
281     const T1_Decoder_Funcs  decoder_funcs = psaux->t1_decoder_funcs;
282
283     FT_Matrix               font_matrix;
284     FT_Vector               font_offset;
285     font_offset.x           = 0;
286     font_offset.y           = 0;
287     FT_Data                 glyph_data;
288     FT_Bool                 must_finish_decoder = FALSE;
289 #ifdef FT_CONFIG_OPTION_INCREMENTAL
290     FT_Bool                 glyph_data_loaded = 0;
291 #endif
292
293
294 #ifdef FT_CONFIG_OPTION_INCREMENTAL
295     if ( glyph_index >= (FT_UInt)face->root.num_glyphs &&
296          !face->root.internal->incremental_interface   )
297 #else
298     if ( glyph_index >= (FT_UInt)face->root.num_glyphs )
299 #endif /* FT_CONFIG_OPTION_INCREMENTAL */
300     {
301       error = FT_THROW( Invalid_Argument );
302       goto Exit;
303     }
304
305     FT_ASSERT( ( face->len_buildchar == 0 ) == ( face->buildchar == NULL ) );
306
307     if ( load_flags & FT_LOAD_NO_RECURSE )
308       load_flags |= FT_LOAD_NO_SCALE | FT_LOAD_NO_HINTING;
309
310     if ( t1size )
311     {
312       glyph->x_scale = t1size->metrics.x_scale;
313       glyph->y_scale = t1size->metrics.y_scale;
314     }
315     else
316     {
317       glyph->x_scale = 0x10000L;
318       glyph->y_scale = 0x10000L;
319     }
320
321     t1glyph->outline.n_points   = 0;
322     t1glyph->outline.n_contours = 0;
323
324     hinting = FT_BOOL( ( load_flags & FT_LOAD_NO_SCALE   ) == 0 &&
325                        ( load_flags & FT_LOAD_NO_HINTING ) == 0 );
326
327     t1glyph->format = FT_GLYPH_FORMAT_OUTLINE;
328
329     error = decoder_funcs->init( &decoder,
330                                  t1glyph->face,
331                                  t1size,
332                                  t1glyph,
333                                  (FT_Byte**)type1->glyph_names,
334                                  face->blend,
335                                  FT_BOOL( hinting ),
336                                  FT_LOAD_TARGET_MODE( load_flags ),
337                                  T1_Parse_Glyph );
338     if ( error )
339       goto Exit;
340
341     must_finish_decoder = TRUE;
342
343     decoder.builder.no_recurse = FT_BOOL(
344                                    ( load_flags & FT_LOAD_NO_RECURSE ) != 0 );
345
346     decoder.num_subrs     = type1->num_subrs;
347     decoder.subrs         = type1->subrs;
348     decoder.subrs_len     = type1->subrs_len;
349
350     decoder.buildchar     = face->buildchar;
351     decoder.len_buildchar = face->len_buildchar;
352
353     /* now load the unscaled outline */
354     error = T1_Parse_Glyph_And_Get_Char_String( &decoder, glyph_index,
355                                                 &glyph_data );
356     if ( error )
357       goto Exit;
358 #ifdef FT_CONFIG_OPTION_INCREMENTAL
359     glyph_data_loaded = 1;
360 #endif
361
362     font_matrix = decoder.font_matrix;
363     font_offset = decoder.font_offset;
364
365     /* save new glyph tables */
366     decoder_funcs->done( &decoder );
367
368     must_finish_decoder = FALSE;
369
370     /* now, set the metrics -- this is rather simple, as   */
371     /* the left side bearing is the xMin, and the top side */
372     /* bearing the yMax                                    */
373     if ( !error )
374     {
375       t1glyph->outline.flags &= FT_OUTLINE_OWNER;
376       t1glyph->outline.flags |= FT_OUTLINE_REVERSE_FILL;
377
378       /* for composite glyphs, return only left side bearing and */
379       /* advance width                                           */
380       if ( load_flags & FT_LOAD_NO_RECURSE )
381       {
382         FT_Slot_Internal  internal = t1glyph->internal;
383
384
385         t1glyph->metrics.horiBearingX =
386           FIXED_TO_INT( decoder.builder.left_bearing.x );
387         t1glyph->metrics.horiAdvance  =
388           FIXED_TO_INT( decoder.builder.advance.x );
389
390         internal->glyph_matrix      = font_matrix;
391         internal->glyph_delta       = font_offset;
392         internal->glyph_transformed = 1;
393       }
394       else
395       {
396         FT_BBox            cbox;
397         FT_Glyph_Metrics*  metrics = &t1glyph->metrics;
398         FT_Vector          advance;
399
400
401         /* copy the _unscaled_ advance width */
402         metrics->horiAdvance =
403           FIXED_TO_INT( decoder.builder.advance.x );
404         t1glyph->linearHoriAdvance =
405           FIXED_TO_INT( decoder.builder.advance.x );
406         t1glyph->internal->glyph_transformed = 0;
407
408         if ( load_flags & FT_LOAD_VERTICAL_LAYOUT )
409         {
410           /* make up vertical ones */
411           metrics->vertAdvance = ( face->type1.font_bbox.yMax -
412                                    face->type1.font_bbox.yMin ) >> 16;
413           t1glyph->linearVertAdvance = metrics->vertAdvance;
414         }
415         else
416         {
417           metrics->vertAdvance =
418             FIXED_TO_INT( decoder.builder.advance.y );
419           t1glyph->linearVertAdvance =
420             FIXED_TO_INT( decoder.builder.advance.y );
421         }
422
423         t1glyph->format = FT_GLYPH_FORMAT_OUTLINE;
424
425         if ( t1size && t1size->metrics.y_ppem < 24 )
426           t1glyph->outline.flags |= FT_OUTLINE_HIGH_PRECISION;
427
428 #if 1
429         /* apply the font matrix, if any */
430         if ( font_matrix.xx != 0x10000L || font_matrix.yy != font_matrix.xx ||
431              font_matrix.xy != 0        || font_matrix.yx != 0              )
432           FT_Outline_Transform( &t1glyph->outline, &font_matrix );
433
434         if ( font_offset.x || font_offset.y )
435           FT_Outline_Translate( &t1glyph->outline,
436                                 font_offset.x,
437                                 font_offset.y );
438
439         advance.x = metrics->horiAdvance;
440         advance.y = 0;
441         FT_Vector_Transform( &advance, &font_matrix );
442         metrics->horiAdvance = advance.x + font_offset.x;
443         advance.x = 0;
444         advance.y = metrics->vertAdvance;
445         FT_Vector_Transform( &advance, &font_matrix );
446         metrics->vertAdvance = advance.y + font_offset.y;
447 #endif
448
449         if ( ( load_flags & FT_LOAD_NO_SCALE ) == 0 )
450         {
451           /* scale the outline and the metrics */
452           FT_Int       n;
453           FT_Outline*  cur = decoder.builder.base;
454           FT_Vector*   vec = cur->points;
455           FT_Fixed     x_scale = glyph->x_scale;
456           FT_Fixed     y_scale = glyph->y_scale;
457
458
459           /* First of all, scale the points, if we are not hinting */
460           if ( !hinting || ! decoder.builder.hints_funcs )
461             for ( n = cur->n_points; n > 0; n--, vec++ )
462             {
463               vec->x = FT_MulFix( vec->x, x_scale );
464               vec->y = FT_MulFix( vec->y, y_scale );
465             }
466
467           /* Then scale the metrics */
468           metrics->horiAdvance = FT_MulFix( metrics->horiAdvance, x_scale );
469           metrics->vertAdvance = FT_MulFix( metrics->vertAdvance, y_scale );
470         }
471
472         /* compute the other metrics */
473         FT_Outline_Get_CBox( &t1glyph->outline, &cbox );
474
475         metrics->width  = cbox.xMax - cbox.xMin;
476         metrics->height = cbox.yMax - cbox.yMin;
477
478         metrics->horiBearingX = cbox.xMin;
479         metrics->horiBearingY = cbox.yMax;
480
481         if ( load_flags & FT_LOAD_VERTICAL_LAYOUT )
482         {
483           /* make up vertical ones */
484           ft_synthesize_vertical_metrics( metrics,
485                                           metrics->vertAdvance );
486         }
487       }
488
489       /* Set control data to the glyph charstrings.  Note that this is */
490       /* _not_ zero-terminated.                                        */
491       t1glyph->control_data = (FT_Byte*)glyph_data.pointer;
492       t1glyph->control_len  = glyph_data.length;
493     }
494
495
496   Exit:
497
498 #ifdef FT_CONFIG_OPTION_INCREMENTAL
499     if ( glyph_data_loaded && face->root.internal->incremental_interface )
500     {
501       face->root.internal->incremental_interface->funcs->free_glyph_data(
502         face->root.internal->incremental_interface->object,
503         &glyph_data );
504
505       /* Set the control data to null - it is no longer available if   */
506       /* loaded incrementally.                                         */
507       t1glyph->control_data = 0;
508       t1glyph->control_len  = 0;
509     }
510 #endif
511
512     if ( must_finish_decoder )
513       decoder_funcs->done( &decoder );
514
515     return error;
516   }
517
518
519 /* END */