1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
|
/***************************************************************************/
/* */
/* t1gload.c */
/* */
/* Type 1 Glyph Loader (body). */
/* */
/* Copyright 1996-2001, 2002, 2003, 2004, 2005, 2006, 2008, 2009, 2010 by */
/* David Turner, Robert Wilhelm, and Werner Lemberg. */
/* */
/* This file is part of the FreeType project, and may only be used, */
/* modified, and distributed under the terms of the FreeType project */
/* license, LICENSE.TXT. By continuing to use, modify, or distribute */
/* this file you indicate that you have read the license and */
/* understand and accept it fully. */
/* */
/***************************************************************************/
#include <ft2build.h>
#include "t1gload.h"
#include <freetype/internal/ftcalc.h>
#include <freetype/internal/ftdebug.h>
#include <freetype/internal/ftstream.h>
#include FT_OUTLINE_H
#include <freetype/internal/psaux.h>
#include "t1errors.h"
/*************************************************************************/
/* */
/* The macro FT_COMPONENT is used in trace mode. It is an implicit */
/* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */
/* messages during execution. */
/* */
#undef FT_COMPONENT
#define FT_COMPONENT trace_t1gload
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/********** *********/
/********** COMPUTE THE MAXIMUM ADVANCE WIDTH *********/
/********** *********/
/********** The following code is in charge of computing *********/
/********** the maximum advance width of the font. It *********/
/********** quickly processes each glyph charstring to *********/
/********** extract the value from either a `sbw' or `seac' *********/
/********** operator. *********/
/********** *********/
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
FT_LOCAL_DEF( FT_Error )
T1_Parse_Glyph_And_Get_Char_String( T1_Decoder decoder,
FT_UInt glyph_index,
FT_Data* char_string )
{
T1_Face face = (T1_Face)decoder->builder.face;
T1_Font type1 = &face->type1;
FT_Error error = T1_Err_Ok;
#ifdef FT_CONFIG_OPTION_INCREMENTAL
FT_Incremental_InterfaceRec *inc =
face->root.internal->incremental_interface;
#endif
decoder->font_matrix = type1->font_matrix;
decoder->font_offset = type1->font_offset;
#ifdef FT_CONFIG_OPTION_INCREMENTAL
/* For incremental fonts get the character data using the */
/* callback function. */
if ( inc )
error = inc->funcs->get_glyph_data( inc->object,
glyph_index, char_string );
else
#endif /* FT_CONFIG_OPTION_INCREMENTAL */
/* For ordinary fonts get the character data stored in the face record. */
{
char_string->pointer = type1->charstrings[glyph_index];
char_string->length = (FT_Int)type1->charstrings_len[glyph_index];
}
if ( !error )
error = decoder->funcs.parse_charstrings(
decoder, (FT_Byte*)char_string->pointer,
char_string->length );
#ifdef FT_CONFIG_OPTION_INCREMENTAL
/* Incremental fonts can optionally override the metrics. */
if ( !error && inc && inc->funcs->get_glyph_metrics )
{
FT_Incremental_MetricsRec metrics;
metrics.bearing_x = FIXED_TO_INT( decoder->builder.left_bearing.x );
metrics.bearing_y = 0;
metrics.advance = FIXED_TO_INT( decoder->builder.advance.x );
metrics.advance_v = FIXED_TO_INT( decoder->builder.advance.y );
error = inc->funcs->get_glyph_metrics( inc->object,
glyph_index, FALSE, &metrics );
decoder->builder.left_bearing.x = INT_TO_FIXED( metrics.bearing_x );
decoder->builder.advance.x = INT_TO_FIXED( metrics.advance );
decoder->builder.advance.y = INT_TO_FIXED( metrics.advance_v );
}
#endif /* FT_CONFIG_OPTION_INCREMENTAL */
return error;
}
FT_CALLBACK_DEF( FT_Error )
T1_Parse_Glyph( T1_Decoder decoder,
FT_UInt glyph_index )
{
FT_Data glyph_data;
FT_Error error = T1_Parse_Glyph_And_Get_Char_String(
decoder, glyph_index, &glyph_data );
#ifdef FT_CONFIG_OPTION_INCREMENTAL
if ( !error )
{
T1_Face face = (T1_Face)decoder->builder.face;
if ( face->root.internal->incremental_interface )
face->root.internal->incremental_interface->funcs->free_glyph_data(
face->root.internal->incremental_interface->object,
&glyph_data );
}
#endif /* FT_CONFIG_OPTION_INCREMENTAL */
return error;
}
FT_LOCAL_DEF( FT_Error )
T1_Compute_Max_Advance( T1_Face face,
FT_Pos* max_advance )
{
FT_Error error;
T1_DecoderRec decoder;
FT_Int glyph_index;
T1_Font type1 = &face->type1;
PSAux_Service psaux = (PSAux_Service)face->psaux;
FT_ASSERT( ( face->len_buildchar == 0 ) == ( face->buildchar == NULL ) );
*max_advance = 0;
/* initialize load decoder */
error = psaux->t1_decoder_funcs->init( &decoder,
(FT_Face)face,
0, /* size */
0, /* glyph slot */
(FT_Byte**)type1->glyph_names,
face->blend,
0,
FT_RENDER_MODE_NORMAL,
T1_Parse_Glyph );
if ( error )
return error;
decoder.builder.metrics_only = 1;
decoder.builder.load_points = 0;
decoder.num_subrs = type1->num_subrs;
decoder.subrs = type1->subrs;
decoder.subrs_len = type1->subrs_len;
decoder.buildchar = face->buildchar;
decoder.len_buildchar = face->len_buildchar;
*max_advance = 0;
/* for each glyph, parse the glyph charstring and extract */
/* the advance width */
for ( glyph_index = 0; glyph_index < type1->num_glyphs; glyph_index++ )
{
/* now get load the unscaled outline */
error = T1_Parse_Glyph( &decoder, glyph_index );
if ( glyph_index == 0 || decoder.builder.advance.x > *max_advance )
*max_advance = decoder.builder.advance.x;
/* ignore the error if one occurred - skip to next glyph */
}
psaux->t1_decoder_funcs->done( &decoder );
return T1_Err_Ok;
}
FT_LOCAL_DEF( FT_Error )
T1_Get_Advances( FT_Face t1face, /* T1_Face */
FT_UInt first,
FT_UInt count,
FT_Int32 load_flags,
FT_Fixed* advances )
{
T1_Face face = (T1_Face)t1face;
T1_DecoderRec decoder;
T1_Font type1 = &face->type1;
PSAux_Service psaux = (PSAux_Service)face->psaux;
FT_UInt nn;
FT_Error error;
if ( load_flags & FT_LOAD_VERTICAL_LAYOUT )
{
for ( nn = 0; nn < count; nn++ )
advances[nn] = 0;
return T1_Err_Ok;
}
error = psaux->t1_decoder_funcs->init( &decoder,
(FT_Face)face,
0, /* size */
0, /* glyph slot */
(FT_Byte**)type1->glyph_names,
face->blend,
0,
FT_RENDER_MODE_NORMAL,
T1_Parse_Glyph );
if ( error )
return error;
decoder.builder.metrics_only = 1;
decoder.builder.load_points = 0;
decoder.num_subrs = type1->num_subrs;
decoder.subrs = type1->subrs;
decoder.subrs_len = type1->subrs_len;
decoder.buildchar = face->buildchar;
decoder.len_buildchar = face->len_buildchar;
for ( nn = 0; nn < count; nn++ )
{
error = T1_Parse_Glyph( &decoder, first + nn );
if ( !error )
advances[nn] = FIXED_TO_INT( decoder.builder.advance.x );
else
advances[nn] = 0;
}
return T1_Err_Ok;
}
FT_LOCAL_DEF( FT_Error )
T1_Load_Glyph( FT_GlyphSlot t1glyph, /* T1_GlyphSlot */
FT_Size t1size, /* T1_Size */
FT_UInt glyph_index,
FT_Int32 load_flags )
{
T1_GlyphSlot glyph = (T1_GlyphSlot)t1glyph;
FT_Error error;
T1_DecoderRec decoder;
T1_Face face = (T1_Face)t1glyph->face;
FT_Bool hinting;
T1_Font type1 = &face->type1;
PSAux_Service psaux = (PSAux_Service)face->psaux;
const T1_Decoder_Funcs decoder_funcs = psaux->t1_decoder_funcs;
FT_Matrix font_matrix;
FT_Vector font_offset;
FT_Data glyph_data;
FT_Bool must_finish_decoder = FALSE;
#ifdef FT_CONFIG_OPTION_INCREMENTAL
FT_Bool glyph_data_loaded = 0;
#endif
#ifdef FT_CONFIG_OPTION_INCREMENTAL
if ( glyph_index >= (FT_UInt)face->root.num_glyphs &&
!face->root.internal->incremental_interface )
#else
if ( glyph_index >= (FT_UInt)face->root.num_glyphs )
#endif /* FT_CONFIG_OPTION_INCREMENTAL */
{
error = T1_Err_Invalid_Argument;
goto Exit;
}
FT_ASSERT( ( face->len_buildchar == 0 ) == ( face->buildchar == NULL ) );
if ( load_flags & FT_LOAD_NO_RECURSE )
load_flags |= FT_LOAD_NO_SCALE | FT_LOAD_NO_HINTING;
if ( t1size )
{
glyph->x_scale = t1size->metrics.x_scale;
glyph->y_scale = t1size->metrics.y_scale;
}
else
{
glyph->x_scale = 0x10000L;
glyph->y_scale = 0x10000L;
}
t1glyph->outline.n_points = 0;
t1glyph->outline.n_contours = 0;
hinting = FT_BOOL( ( load_flags & FT_LOAD_NO_SCALE ) == 0 &&
( load_flags & FT_LOAD_NO_HINTING ) == 0 );
t1glyph->format = FT_GLYPH_FORMAT_OUTLINE;
error = decoder_funcs->init( &decoder,
t1glyph->face,
t1size,
t1glyph,
(FT_Byte**)type1->glyph_names,
face->blend,
FT_BOOL( hinting ),
FT_LOAD_TARGET_MODE( load_flags ),
T1_Parse_Glyph );
if ( error )
goto Exit;
must_finish_decoder = TRUE;
decoder.builder.no_recurse = FT_BOOL(
( load_flags & FT_LOAD_NO_RECURSE ) != 0 );
decoder.num_subrs = type1->num_subrs;
decoder.subrs = type1->subrs;
decoder.subrs_len = type1->subrs_len;
decoder.buildchar = face->buildchar;
decoder.len_buildchar = face->len_buildchar;
/* now load the unscaled outline */
error = T1_Parse_Glyph_And_Get_Char_String( &decoder, glyph_index,
&glyph_data );
if ( error )
goto Exit;
#ifdef FT_CONFIG_OPTION_INCREMENTAL
glyph_data_loaded = 1;
#endif
font_matrix = decoder.font_matrix;
font_offset = decoder.font_offset;
/* save new glyph tables */
decoder_funcs->done( &decoder );
must_finish_decoder = FALSE;
/* now, set the metrics -- this is rather simple, as */
/* the left side bearing is the xMin, and the top side */
/* bearing the yMax */
if ( !error )
{
t1glyph->outline.flags &= FT_OUTLINE_OWNER;
t1glyph->outline.flags |= FT_OUTLINE_REVERSE_FILL;
/* for composite glyphs, return only left side bearing and */
/* advance width */
if ( load_flags & FT_LOAD_NO_RECURSE )
{
FT_Slot_Internal internal = t1glyph->internal;
t1glyph->metrics.horiBearingX =
FIXED_TO_INT( decoder.builder.left_bearing.x );
t1glyph->metrics.horiAdvance =
FIXED_TO_INT( decoder.builder.advance.x );
internal->glyph_matrix = font_matrix;
internal->glyph_delta = font_offset;
internal->glyph_transformed = 1;
}
else
{
FT_BBox cbox;
FT_Glyph_Metrics* metrics = &t1glyph->metrics;
FT_Vector advance;
/* copy the _unscaled_ advance width */
metrics->horiAdvance =
FIXED_TO_INT( decoder.builder.advance.x );
t1glyph->linearHoriAdvance =
FIXED_TO_INT( decoder.builder.advance.x );
t1glyph->internal->glyph_transformed = 0;
if ( load_flags & FT_LOAD_VERTICAL_LAYOUT )
{
/* make up vertical ones */
metrics->vertAdvance = ( face->type1.font_bbox.yMax -
face->type1.font_bbox.yMin ) >> 16;
t1glyph->linearVertAdvance = metrics->vertAdvance;
}
else
{
metrics->vertAdvance =
FIXED_TO_INT( decoder.builder.advance.y );
t1glyph->linearVertAdvance =
FIXED_TO_INT( decoder.builder.advance.y );
}
t1glyph->format = FT_GLYPH_FORMAT_OUTLINE;
if ( t1size && t1size->metrics.y_ppem < 24 )
t1glyph->outline.flags |= FT_OUTLINE_HIGH_PRECISION;
#if 1
/* apply the font matrix, if any */
if ( font_matrix.xx != 0x10000L || font_matrix.yy != font_matrix.xx ||
font_matrix.xy != 0 || font_matrix.yx != 0 )
FT_Outline_Transform( &t1glyph->outline, &font_matrix );
if ( font_offset.x || font_offset.y )
FT_Outline_Translate( &t1glyph->outline,
font_offset.x,
font_offset.y );
advance.x = metrics->horiAdvance;
advance.y = 0;
FT_Vector_Transform( &advance, &font_matrix );
metrics->horiAdvance = advance.x + font_offset.x;
advance.x = 0;
advance.y = metrics->vertAdvance;
FT_Vector_Transform( &advance, &font_matrix );
metrics->vertAdvance = advance.y + font_offset.y;
#endif
if ( ( load_flags & FT_LOAD_NO_SCALE ) == 0 )
{
/* scale the outline and the metrics */
FT_Int n;
FT_Outline* cur = decoder.builder.base;
FT_Vector* vec = cur->points;
FT_Fixed x_scale = glyph->x_scale;
FT_Fixed y_scale = glyph->y_scale;
/* First of all, scale the points, if we are not hinting */
if ( !hinting || ! decoder.builder.hints_funcs )
for ( n = cur->n_points; n > 0; n--, vec++ )
{
vec->x = FT_MulFix( vec->x, x_scale );
vec->y = FT_MulFix( vec->y, y_scale );
}
/* Then scale the metrics */
metrics->horiAdvance = FT_MulFix( metrics->horiAdvance, x_scale );
metrics->vertAdvance = FT_MulFix( metrics->vertAdvance, y_scale );
}
/* compute the other metrics */
FT_Outline_Get_CBox( &t1glyph->outline, &cbox );
metrics->width = cbox.xMax - cbox.xMin;
metrics->height = cbox.yMax - cbox.yMin;
metrics->horiBearingX = cbox.xMin;
metrics->horiBearingY = cbox.yMax;
if ( load_flags & FT_LOAD_VERTICAL_LAYOUT )
{
/* make up vertical ones */
ft_synthesize_vertical_metrics( metrics,
metrics->vertAdvance );
}
}
/* Set control data to the glyph charstrings. Note that this is */
/* _not_ zero-terminated. */
t1glyph->control_data = (FT_Byte*)glyph_data.pointer;
t1glyph->control_len = glyph_data.length;
}
Exit:
#ifdef FT_CONFIG_OPTION_INCREMENTAL
if ( glyph_data_loaded && face->root.internal->incremental_interface )
{
face->root.internal->incremental_interface->funcs->free_glyph_data(
face->root.internal->incremental_interface->object,
&glyph_data );
/* Set the control data to null - it is no longer available if */
/* loaded incrementally. */
t1glyph->control_data = 0;
t1glyph->control_len = 0;
}
#endif
if ( must_finish_decoder )
decoder_funcs->done( &decoder );
return error;
}
/* END */
|
