1 /***************************************************************************/
2 /* */
3 /* ftobjs.h */
4 /* */
5 /* The FreeType private base classes (specification). */
6 /* */
7 /* Copyright 1996-2018 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 /*************************************************************************/
20 /* */
21 /* This file contains the definition of all internal FreeType classes. */
22 /* */
23 /*************************************************************************/
24
25
26 #ifndef FTOBJS_H_
27 #define FTOBJS_H_
28
29 #include <ft2build.h>
30 #include FT_RENDER_H
31 #include FT_SIZES_H
32 #include FT_LCD_FILTER_H
33 #include FT_INTERNAL_MEMORY_H
34 #include FT_INTERNAL_GLYPH_LOADER_H
35 #include FT_INTERNAL_DRIVER_H
36 #include FT_INTERNAL_AUTOHINT_H
37 #include FT_INTERNAL_SERVICE_H
38 #include FT_INTERNAL_PIC_H
39 #include FT_INTERNAL_CALC_H
40
41 #ifdef FT_CONFIG_OPTION_INCREMENTAL
42 #include FT_INCREMENTAL_H
43 #endif
44
45
46 FT_BEGIN_HEADER
47
48
49 /*************************************************************************/
50 /* */
51 /* Some generic definitions. */
52 /* */
53 #ifndef TRUE
54 #define TRUE 1
55 #endif
56
57 #ifndef FALSE
58 #define FALSE 0
59 #endif
60
61 #ifndef NULL
62 #define NULL (void*)0
63 #endif
64
65
66 /*************************************************************************/
67 /* */
68 /* The min and max functions missing in C. As usual, be careful not to */
69 /* write things like FT_MIN( a++, b++ ) to avoid side effects. */
70 /* */
71 #define FT_MIN( a, b ) ( (a) < (b) ? (a) : (b) )
72 #define FT_MAX( a, b ) ( (a) > (b) ? (a) : (b) )
73
74 #define FT_ABS( a ) ( (a) < 0 ? -(a) : (a) )
75
76 /*
77 * Approximate sqrt(x*x+y*y) using the `alpha max plus beta min'
78 * algorithm. We use alpha = 1, beta = 3/8, giving us results with a
79 * largest error less than 7% compared to the exact value.
80 */
81 #define FT_HYPOT( x, y ) \
82 ( x = FT_ABS( x ), \
83 y = FT_ABS( y ), \
84 x > y ? x + ( 3 * y >> 3 ) \
85 : y + ( 3 * x >> 3 ) )
86
87 /* we use FT_TYPEOF to suppress signedness compilation warnings */
88 #define FT_PAD_FLOOR( x, n ) ( (x) & ~FT_TYPEOF( x )( (n) - 1 ) )
89 #define FT_PAD_ROUND( x, n ) FT_PAD_FLOOR( (x) + (n) / 2, n )
90 #define FT_PAD_CEIL( x, n ) FT_PAD_FLOOR( (x) + (n) - 1, n )
91
92 #define FT_PIX_FLOOR( x ) ( (x) & ~FT_TYPEOF( x )63 )
93 #define FT_PIX_ROUND( x ) FT_PIX_FLOOR( (x) + 32 )
94 #define FT_PIX_CEIL( x ) FT_PIX_FLOOR( (x) + 63 )
95
96 /* specialized versions (for signed values) */
97 /* that don't produce run-time errors due to integer overflow */
98 #define FT_PAD_ROUND_LONG( x, n ) FT_PAD_FLOOR( ADD_LONG( (x), (n) / 2 ), \
99 n )
100 #define FT_PAD_CEIL_LONG( x, n ) FT_PAD_FLOOR( ADD_LONG( (x), (n) - 1 ), \
101 n )
102 #define FT_PIX_ROUND_LONG( x ) FT_PIX_FLOOR( ADD_LONG( (x), 32 ) )
103 #define FT_PIX_CEIL_LONG( x ) FT_PIX_FLOOR( ADD_LONG( (x), 63 ) )
104
105 #define FT_PAD_ROUND_INT32( x, n ) FT_PAD_FLOOR( ADD_INT32( (x), (n) / 2 ), \
106 n )
107 #define FT_PAD_CEIL_INT32( x, n ) FT_PAD_FLOOR( ADD_INT32( (x), (n) - 1 ), \
108 n )
109 #define FT_PIX_ROUND_INT32( x ) FT_PIX_FLOOR( ADD_INT32( (x), 32 ) )
110 #define FT_PIX_CEIL_INT32( x ) FT_PIX_FLOOR( ADD_INT32( (x), 63 ) )
111
112
113 /*
114 * character classification functions -- since these are used to parse
115 * font files, we must not use those in <ctypes.h> which are
116 * locale-dependent
117 */
118 #define ft_isdigit( x ) ( ( (unsigned)(x) - '0' ) < 10U )
119
120 #define ft_isxdigit( x ) ( ( (unsigned)(x) - '0' ) < 10U || \
121 ( (unsigned)(x) - 'a' ) < 6U || \
122 ( (unsigned)(x) - 'A' ) < 6U )
123
124 /* the next two macros assume ASCII representation */
125 #define ft_isupper( x ) ( ( (unsigned)(x) - 'A' ) < 26U )
126 #define ft_islower( x ) ( ( (unsigned)(x) - 'a' ) < 26U )
127
128 #define ft_isalpha( x ) ( ft_isupper( x ) || ft_islower( x ) )
129 #define ft_isalnum( x ) ( ft_isdigit( x ) || ft_isalpha( x ) )
130
131
132 /*************************************************************************/
133 /*************************************************************************/
134 /*************************************************************************/
135 /**** ****/
136 /**** ****/
170 (*FT_CMap_InitFunc)( FT_CMap cmap,
171 FT_Pointer init_data );
172
173 typedef void
174 (*FT_CMap_DoneFunc)( FT_CMap cmap );
175
176 typedef FT_UInt
177 (*FT_CMap_CharIndexFunc)( FT_CMap cmap,
178 FT_UInt32 char_code );
179
180 typedef FT_UInt
181 (*FT_CMap_CharNextFunc)( FT_CMap cmap,
182 FT_UInt32 *achar_code );
183
184 typedef FT_UInt
185 (*FT_CMap_CharVarIndexFunc)( FT_CMap cmap,
186 FT_CMap unicode_cmap,
187 FT_UInt32 char_code,
188 FT_UInt32 variant_selector );
189
190 typedef FT_Bool
191 (*FT_CMap_CharVarIsDefaultFunc)( FT_CMap cmap,
192 FT_UInt32 char_code,
193 FT_UInt32 variant_selector );
194
195 typedef FT_UInt32 *
196 (*FT_CMap_VariantListFunc)( FT_CMap cmap,
197 FT_Memory mem );
198
199 typedef FT_UInt32 *
200 (*FT_CMap_CharVariantListFunc)( FT_CMap cmap,
201 FT_Memory mem,
202 FT_UInt32 char_code );
203
204 typedef FT_UInt32 *
205 (*FT_CMap_VariantCharListFunc)( FT_CMap cmap,
206 FT_Memory mem,
207 FT_UInt32 variant_selector );
208
209
210 typedef struct FT_CMap_ClassRec_
211 {
212 FT_ULong size;
213
214 FT_CMap_InitFunc init;
215 FT_CMap_DoneFunc done;
216 FT_CMap_CharIndexFunc char_index;
217 FT_CMap_CharNextFunc char_next;
218
219 /* Subsequent entries are special ones for format 14 -- the variant */
220 /* selector subtable which behaves like no other */
221
222 FT_CMap_CharVarIndexFunc char_var_index;
223 FT_CMap_CharVarIsDefaultFunc char_var_default;
224 FT_CMap_VariantListFunc variant_list;
225 FT_CMap_CharVariantListFunc charvariant_list;
226 FT_CMap_VariantCharListFunc variantchar_list;
227
228 } FT_CMap_ClassRec;
229
230
231 #ifndef FT_CONFIG_OPTION_PIC
232
233 #define FT_DECLARE_CMAP_CLASS( class_ ) \
234 FT_CALLBACK_TABLE const FT_CMap_ClassRec class_;
235
236 #define FT_DEFINE_CMAP_CLASS( \
237 class_, \
238 size_, \
239 init_, \
240 done_, \
241 char_index_, \
242 char_next_, \
243 char_var_index_, \
244 char_var_default_, \
245 variant_list_, \
246 charvariant_list_, \
247 variantchar_list_ ) \
248 FT_CALLBACK_TABLE_DEF \
249 const FT_CMap_ClassRec class_ = \
250 { \
251 size_, \
252 init_, \
253 done_, \
254 char_index_, \
255 char_next_, \
256 char_var_index_, \
257 char_var_default_, \
258 variant_list_, \
259 charvariant_list_, \
260 variantchar_list_ \
261 };
262
263 #else /* FT_CONFIG_OPTION_PIC */
264
265 #define FT_DECLARE_CMAP_CLASS( class_ ) \
266 void \
267 FT_Init_Class_ ## class_( FT_Library library, \
268 FT_CMap_ClassRec* clazz );
269
270 #define FT_DEFINE_CMAP_CLASS( \
271 class_, \
272 size_, \
273 init_, \
274 done_, \
275 char_index_, \
276 char_next_, \
277 char_var_index_, \
278 char_var_default_, \
279 variant_list_, \
280 charvariant_list_, \
281 variantchar_list_ ) \
282 void \
283 FT_Init_Class_ ## class_( FT_Library library, \
284 FT_CMap_ClassRec* clazz ) \
285 { \
286 FT_UNUSED( library ); \
287 \
288 clazz->size = size_; \
289 clazz->init = init_; \
290 clazz->done = done_; \
291 clazz->char_index = char_index_; \
292 clazz->char_next = char_next_; \
293 clazz->char_var_index = char_var_index_; \
294 clazz->char_var_default = char_var_default_; \
295 clazz->variant_list = variant_list_; \
296 clazz->charvariant_list = charvariant_list_; \
297 clazz->variantchar_list = variantchar_list_; \
298 }
299
300 #endif /* FT_CONFIG_OPTION_PIC */
301
302
303 /* create a new charmap and add it to charmap->face */
304 FT_BASE( FT_Error )
305 FT_CMap_New( FT_CMap_Class clazz,
306 FT_Pointer init_data,
307 FT_CharMap charmap,
308 FT_CMap *acmap );
309
310 /* destroy a charmap and remove it from face's list */
311 FT_BASE( void )
312 FT_CMap_Done( FT_CMap cmap );
313
314
315 /* adds LCD padding to Min and Max boundaries */
316 FT_BASE( void )
317 ft_lcd_padding( FT_Pos* Min,
318 FT_Pos* Max,
319 FT_GlyphSlot slot );
320
321 #ifdef FT_CONFIG_OPTION_SUBPIXEL_RENDERING
322
323 typedef void (*FT_Bitmap_LcdFilterFunc)( FT_Bitmap* bitmap,
324 FT_Render_Mode render_mode,
325 FT_Byte* weights );
326
327
328 /* This is the default LCD filter, an in-place, 5-tap FIR filter. */
329 FT_BASE( void )
330 ft_lcd_filter_fir( FT_Bitmap* bitmap,
331 FT_Render_Mode mode,
332 FT_LcdFiveTapFilter weights );
333
334 #endif /* FT_CONFIG_OPTION_SUBPIXEL_RENDERING */
335
336 /*************************************************************************/
337 /* */
338 /* <Struct> */
339 /* FT_Face_InternalRec */
340 /* */
341 /* <Description> */
342 /* This structure contains the internal fields of each FT_Face */
343 /* object. These fields may change between different releases of */
344 /* FreeType. */
345 /* */
346 /* <Fields> */
347 /* max_points :: */
348 /* The maximum number of points used to store the vectorial outline */
349 /* of any glyph in this face. If this value cannot be known in */
350 /* advance, or if the face isn't scalable, this should be set to 0. */
351 /* Only relevant for scalable formats. */
352 /* */
353 /* max_contours :: */
354 /* The maximum number of contours used to store the vectorial */
355 /* outline of any glyph in this face. If this value cannot be */
356 /* known in advance, or if the face isn't scalable, this should be */
357 /* set to 0. Only relevant for scalable formats. */
358 /* */
359 /* transform_matrix :: */
360 /* A 2x2 matrix of 16.16 coefficients used to transform glyph */
361 /* outlines after they are loaded from the font. Only used by the */
362 /* convenience functions. */
363 /* */
364 /* transform_delta :: */
365 /* A translation vector used to transform glyph outlines after they */
366 /* are loaded from the font. Only used by the convenience */
367 /* functions. */
368 /* */
369 /* transform_flags :: */
370 /* Some flags used to classify the transform. Only used by the */
371 /* convenience functions. */
372 /* */
373 /* services :: */
374 /* A cache for frequently used services. It should be only */
375 /* accessed with the macro `FT_FACE_LOOKUP_SERVICE'. */
376 /* */
377 /* incremental_interface :: */
378 /* If non-null, the interface through which glyph data and metrics */
379 /* are loaded incrementally for faces that do not provide all of */
380 /* this data when first opened. This field exists only if */
381 /* @FT_CONFIG_OPTION_INCREMENTAL is defined. */
382 /* */
383 /* no_stem_darkening :: */
384 /* Overrides the module-level default, see @stem-darkening[cff], */
385 /* for example. FALSE and TRUE toggle stem darkening on and off, */
386 /* respectively, value~-1 means to use the module/driver default. */
387 /* */
388 /* random_seed :: */
389 /* If positive, override the seed value for the CFF `random' */
390 /* operator. Value~0 means to use the font's value. Value~-1 */
391 /* means to use the CFF driver's default. */
392 /* */
393 /* lcd_weights :: */
394 /* lcd_filter_func :: */
395 /* If subpixel rendering is activated, the LCD filtering weights */
396 /* and callback function. */
397 /* */
398 /* refcount :: */
399 /* A counter initialized to~1 at the time an @FT_Face structure is */
400 /* created. @FT_Reference_Face increments this counter, and */
401 /* @FT_Done_Face only destroys a face if the counter is~1, */
402 /* otherwise it simply decrements it. */
403 /* */
404 typedef struct FT_Face_InternalRec_
405 {
406 FT_Matrix transform_matrix;
407 FT_Vector transform_delta;
408 FT_Int transform_flags;
409
410 FT_ServiceCacheRec services;
411
412 #ifdef FT_CONFIG_OPTION_INCREMENTAL
413 FT_Incremental_InterfaceRec* incremental_interface;
414 #endif
415
416 FT_Char no_stem_darkening;
417 FT_Int32 random_seed;
418
419 #ifdef FT_CONFIG_OPTION_SUBPIXEL_RENDERING
420 FT_LcdFiveTapFilter lcd_weights; /* filter weights, if any */
421 FT_Bitmap_LcdFilterFunc lcd_filter_func; /* filtering callback */
422 #endif
423
424 FT_Int refcount;
425
426 } FT_Face_InternalRec;
427
428
429 /*************************************************************************/
430 /* */
431 /* <Struct> */
432 /* FT_Slot_InternalRec */
433 /* */
434 /* <Description> */
435 /* This structure contains the internal fields of each FT_GlyphSlot */
436 /* object. These fields may change between different releases of */
437 /* FreeType. */
438 /* */
439 /* <Fields> */
440 /* loader :: The glyph loader object used to load outlines */
441 /* into the glyph slot. */
442 /* */
443 /* flags :: Possible values are zero or */
444 /* FT_GLYPH_OWN_BITMAP. The latter indicates */
445 /* that the FT_GlyphSlot structure owns the */
446 /* bitmap buffer. */
447 /* */
448 /* glyph_transformed :: Boolean. Set to TRUE when the loaded glyph */
449 /* must be transformed through a specific */
450 /* font transformation. This is _not_ the same */
451 /* as the face transform set through */
452 /* FT_Set_Transform(). */
453 /* */
454 /* glyph_matrix :: The 2x2 matrix corresponding to the glyph */
455 /* transformation, if necessary. */
456 /* */
457 /* glyph_delta :: The 2d translation vector corresponding to */
458 /* the glyph transformation, if necessary. */
459 /* */
460 /* glyph_hints :: Format-specific glyph hints management. */
461 /* */
462
463 #define FT_GLYPH_OWN_BITMAP 0x1U
464
465 typedef struct FT_Slot_InternalRec_
466 {
467 FT_GlyphLoader loader;
468 FT_UInt flags;
469 FT_Bool glyph_transformed;
470 FT_Matrix glyph_matrix;
471 FT_Vector glyph_delta;
472 void* glyph_hints;
473
474 } FT_GlyphSlot_InternalRec;
475
476
477 /*************************************************************************/
478 /* */
479 /* <Struct> */
480 /* FT_Size_InternalRec */
481 /* */
482 /* <Description> */
483 /* This structure contains the internal fields of each FT_Size */
484 /* object. */
485 /* */
486 /* <Fields> */
487 /* module_data :: Data specific to a driver module. */
488 /* */
489 /* autohint_mode :: The used auto-hinting mode. */
490 /* */
491 /* autohint_metrics :: Metrics used by the auto-hinter. */
492 /* */
493 /*************************************************************************/
494
495 typedef struct FT_Size_InternalRec_
496 {
497 void* module_data;
498
499 FT_Render_Mode autohint_mode;
500 FT_Size_Metrics autohint_metrics;
501
502 } FT_Size_InternalRec;
503
504
505 /*************************************************************************/
506 /*************************************************************************/
507 /*************************************************************************/
508 /**** ****/
509 /**** ****/
510 /**** M O D U L E S ****/
511 /**** ****/
512 /**** ****/
513 /*************************************************************************/
514 /*************************************************************************/
515 /*************************************************************************/
516
517
518 /*************************************************************************/
519 /* */
520 /* <Struct> */
521 /* FT_ModuleRec */
522 /* */
523 /* <Description> */
524 /* A module object instance. */
525 /* */
526 /* <Fields> */
527 /* clazz :: A pointer to the module's class. */
528 /* */
529 /* library :: A handle to the parent library object. */
530 /* */
531 /* memory :: A handle to the memory manager. */
532 /* */
533 typedef struct FT_ModuleRec_
534 {
535 FT_Module_Class* clazz;
536 FT_Library library;
537 FT_Memory memory;
538
539 } FT_ModuleRec;
540
541
542 /* typecast an object to an FT_Module */
543 #define FT_MODULE( x ) ( (FT_Module)(x) )
544
545 #define FT_MODULE_CLASS( x ) FT_MODULE( x )->clazz
546 #define FT_MODULE_LIBRARY( x ) FT_MODULE( x )->library
547 #define FT_MODULE_MEMORY( x ) FT_MODULE( x )->memory
548
549
550 #define FT_MODULE_IS_DRIVER( x ) ( FT_MODULE_CLASS( x )->module_flags & \
551 FT_MODULE_FONT_DRIVER )
552
555
556 #define FT_MODULE_IS_HINTER( x ) ( FT_MODULE_CLASS( x )->module_flags & \
557 FT_MODULE_HINTER )
558
559 #define FT_MODULE_IS_STYLER( x ) ( FT_MODULE_CLASS( x )->module_flags & \
560 FT_MODULE_STYLER )
561
562 #define FT_DRIVER_IS_SCALABLE( x ) ( FT_MODULE_CLASS( x )->module_flags & \
563 FT_MODULE_DRIVER_SCALABLE )
564
565 #define FT_DRIVER_USES_OUTLINES( x ) !( FT_MODULE_CLASS( x )->module_flags & \
566 FT_MODULE_DRIVER_NO_OUTLINES )
567
568 #define FT_DRIVER_HAS_HINTER( x ) ( FT_MODULE_CLASS( x )->module_flags & \
569 FT_MODULE_DRIVER_HAS_HINTER )
570
571 #define FT_DRIVER_HINTS_LIGHTLY( x ) ( FT_MODULE_CLASS( x )->module_flags & \
572 FT_MODULE_DRIVER_HINTS_LIGHTLY )
573
574
575 /*************************************************************************/
576 /* */
577 /* <Function> */
578 /* FT_Get_Module_Interface */
579 /* */
580 /* <Description> */
581 /* Finds a module and returns its specific interface as a typeless */
582 /* pointer. */
583 /* */
584 /* <Input> */
585 /* library :: A handle to the library object. */
586 /* */
587 /* module_name :: The module's name (as an ASCII string). */
588 /* */
589 /* <Return> */
590 /* A module-specific interface if available, 0 otherwise. */
591 /* */
592 /* <Note> */
593 /* You should better be familiar with FreeType internals to know */
594 /* which module to look for, and what its interface is :-) */
595 /* */
596 FT_BASE( const void* )
597 FT_Get_Module_Interface( FT_Library library,
598 const char* mod_name );
599
600 FT_BASE( FT_Pointer )
601 ft_module_get_service( FT_Module module,
602 const char* service_id,
603 FT_Bool global );
604
605 #ifdef FT_CONFIG_OPTION_ENVIRONMENT_PROPERTIES
606 FT_BASE( FT_Error )
607 ft_property_string_set( FT_Library library,
608 const FT_String* module_name,
609 const FT_String* property_name,
610 FT_String* value );
611 #endif
612
613 /* */
614
615
626 /*************************************************************************/
627
628 /* a few macros used to perform easy typecasts with minimal brain damage */
629
630 #define FT_FACE( x ) ( (FT_Face)(x) )
631 #define FT_SIZE( x ) ( (FT_Size)(x) )
632 #define FT_SLOT( x ) ( (FT_GlyphSlot)(x) )
633
634 #define FT_FACE_DRIVER( x ) FT_FACE( x )->driver
635 #define FT_FACE_LIBRARY( x ) FT_FACE_DRIVER( x )->root.library
636 #define FT_FACE_MEMORY( x ) FT_FACE( x )->memory
637 #define FT_FACE_STREAM( x ) FT_FACE( x )->stream
638
639 #define FT_SIZE_FACE( x ) FT_SIZE( x )->face
640 #define FT_SLOT_FACE( x ) FT_SLOT( x )->face
641
642 #define FT_FACE_SLOT( x ) FT_FACE( x )->glyph
643 #define FT_FACE_SIZE( x ) FT_FACE( x )->size
644
645
646 /*************************************************************************/
647 /* */
648 /* <Function> */
649 /* FT_New_GlyphSlot */
650 /* */
651 /* <Description> */
652 /* It is sometimes useful to have more than one glyph slot for a */
653 /* given face object. This function is used to create additional */
654 /* slots. All of them are automatically discarded when the face is */
655 /* destroyed. */
656 /* */
657 /* <Input> */
658 /* face :: A handle to a parent face object. */
659 /* */
660 /* <Output> */
661 /* aslot :: A handle to a new glyph slot object. */
662 /* */
663 /* <Return> */
664 /* FreeType error code. 0 means success. */
665 /* */
666 FT_BASE( FT_Error )
667 FT_New_GlyphSlot( FT_Face face,
668 FT_GlyphSlot *aslot );
669
670
671 /*************************************************************************/
672 /* */
673 /* <Function> */
674 /* FT_Done_GlyphSlot */
675 /* */
676 /* <Description> */
677 /* Destroys a given glyph slot. Remember however that all slots are */
678 /* automatically destroyed with its parent. Using this function is */
679 /* not always mandatory. */
680 /* */
681 /* <Input> */
682 /* slot :: A handle to a target glyph slot. */
683 /* */
684 FT_BASE( void )
685 FT_Done_GlyphSlot( FT_GlyphSlot slot );
686
687 /* */
688
689 #define FT_REQUEST_WIDTH( req ) \
690 ( (req)->horiResolution \
691 ? ( (req)->width * (FT_Pos)(req)->horiResolution + 36 ) / 72 \
692 : (req)->width )
693
694 #define FT_REQUEST_HEIGHT( req ) \
695 ( (req)->vertResolution \
696 ? ( (req)->height * (FT_Pos)(req)->vertResolution + 36 ) / 72 \
697 : (req)->height )
698
699
700 /* Set the metrics according to a bitmap strike. */
701 FT_BASE( void )
702 FT_Select_Metrics( FT_Face face,
703 FT_ULong strike_index );
713 FT_BASE( FT_Error )
714 FT_Match_Size( FT_Face face,
715 FT_Size_Request req,
716 FT_Bool ignore_width,
717 FT_ULong* size_index );
718
719
720 /* Use the horizontal metrics to synthesize the vertical metrics. */
721 /* If `advance' is zero, it is also synthesized. */
722 FT_BASE( void )
723 ft_synthesize_vertical_metrics( FT_Glyph_Metrics* metrics,
724 FT_Pos advance );
725
726
727 /* Free the bitmap of a given glyphslot when needed (i.e., only when it */
728 /* was allocated with ft_glyphslot_alloc_bitmap). */
729 FT_BASE( void )
730 ft_glyphslot_free_bitmap( FT_GlyphSlot slot );
731
732
733 /* Preset bitmap metrics of an outline glyphslot prior to rendering. */
734 FT_BASE( void )
735 ft_glyphslot_preset_bitmap( FT_GlyphSlot slot,
736 FT_Render_Mode mode,
737 const FT_Vector* origin );
738
739 /* Allocate a new bitmap buffer in a glyph slot. */
740 FT_BASE( FT_Error )
741 ft_glyphslot_alloc_bitmap( FT_GlyphSlot slot,
742 FT_ULong size );
743
744
745 /* Set the bitmap buffer in a glyph slot to a given pointer. The buffer */
746 /* will not be freed by a later call to ft_glyphslot_free_bitmap. */
747 FT_BASE( void )
748 ft_glyphslot_set_bitmap( FT_GlyphSlot slot,
749 FT_Byte* buffer );
750
751
752 /*************************************************************************/
753 /*************************************************************************/
754 /*************************************************************************/
785 /*************************************************************************/
786 /*************************************************************************/
787 /*************************************************************************/
788 /**** ****/
789 /**** ****/
790 /**** F O N T D R I V E R S ****/
791 /**** ****/
792 /**** ****/
793 /*************************************************************************/
794 /*************************************************************************/
795 /*************************************************************************/
796
797
798 /* typecast a module into a driver easily */
799 #define FT_DRIVER( x ) ( (FT_Driver)(x) )
800
801 /* typecast a module as a driver, and get its driver class */
802 #define FT_DRIVER_CLASS( x ) FT_DRIVER( x )->clazz
803
804
805 /*************************************************************************/
806 /* */
807 /* <Struct> */
808 /* FT_DriverRec */
809 /* */
810 /* <Description> */
811 /* The root font driver class. A font driver is responsible for */
812 /* managing and loading font files of a given format. */
813 /* */
814 /* <Fields> */
815 /* root :: Contains the fields of the root module class. */
816 /* */
817 /* clazz :: A pointer to the font driver's class. Note that */
818 /* this is NOT root.clazz. `class' wasn't used */
819 /* as it is a reserved word in C++. */
820 /* */
821 /* faces_list :: The list of faces currently opened by this */
822 /* driver. */
823 /* */
824 /* glyph_loader :: Unused. Used to be glyph loader for all faces */
825 /* managed by this driver. */
826 /* */
827 typedef struct FT_DriverRec_
828 {
829 FT_ModuleRec root;
830 FT_Driver_Class clazz;
831 FT_ListRec faces_list;
832 FT_GlyphLoader glyph_loader;
833
834 } FT_DriverRec;
835
836
837 /*************************************************************************/
838 /*************************************************************************/
839 /*************************************************************************/
840 /**** ****/
841 /**** ****/
842 /**** L I B R A R I E S ****/
843 /**** ****/
844 /**** ****/
845 /*************************************************************************/
846 /*************************************************************************/
847 /*************************************************************************/
848
849
850 /* This hook is used by the TrueType debugger. It must be set to an */
851 /* alternate truetype bytecode interpreter function. */
852 #define FT_DEBUG_HOOK_TRUETYPE 0
853
854
855 /*************************************************************************/
856 /* */
857 /* <Struct> */
858 /* FT_LibraryRec */
859 /* */
860 /* <Description> */
861 /* The FreeType library class. This is the root of all FreeType */
862 /* data. Use FT_New_Library() to create a library object, and */
863 /* FT_Done_Library() to discard it and all child objects. */
864 /* */
865 /* <Fields> */
866 /* memory :: The library's memory object. Manages memory */
867 /* allocation. */
868 /* */
869 /* version_major :: The major version number of the library. */
870 /* */
871 /* version_minor :: The minor version number of the library. */
872 /* */
873 /* version_patch :: The current patch level of the library. */
874 /* */
875 /* num_modules :: The number of modules currently registered */
876 /* within this library. This is set to 0 for new */
877 /* libraries. New modules are added through the */
878 /* FT_Add_Module() API function. */
879 /* */
880 /* modules :: A table used to store handles to the currently */
881 /* registered modules. Note that each font driver */
882 /* contains a list of its opened faces. */
883 /* */
884 /* renderers :: The list of renderers currently registered */
885 /* within the library. */
886 /* */
887 /* cur_renderer :: The current outline renderer. This is a */
888 /* shortcut used to avoid parsing the list on */
889 /* each call to FT_Outline_Render(). It is a */
890 /* handle to the current renderer for the */
891 /* FT_GLYPH_FORMAT_OUTLINE format. */
892 /* */
893 /* auto_hinter :: The auto-hinter module interface. */
894 /* */
895 /* debug_hooks :: An array of four function pointers that allow */
896 /* debuggers to hook into a font format's */
897 /* interpreter. Currently, only the TrueType */
898 /* bytecode debugger uses this. */
899 /* */
900 /* lcd_weights :: If subpixel rendering is activated, the LCD */
901 /* filter weights, if any. */
902 /* */
903 /* lcd_filter_func :: If subpixel rendering is activated, the LCD */
904 /* filtering callback function. */
905 /* */
906 /* pic_container :: Contains global structs and tables, instead */
907 /* of defining them globally. */
908 /* */
909 /* refcount :: A counter initialized to~1 at the time an */
910 /* @FT_Library structure is created. */
911 /* @FT_Reference_Library increments this counter, */
912 /* and @FT_Done_Library only destroys a library */
913 /* if the counter is~1, otherwise it simply */
914 /* decrements it. */
915 /* */
916 typedef struct FT_LibraryRec_
917 {
918 FT_Memory memory; /* library's memory manager */
919
920 FT_Int version_major;
921 FT_Int version_minor;
922 FT_Int version_patch;
923
924 FT_UInt num_modules;
925 FT_Module modules[FT_MAX_MODULES]; /* module objects */
926
927 FT_ListRec renderers; /* list of renderers */
928 FT_Renderer cur_renderer; /* current outline renderer */
929 FT_Module auto_hinter;
930
931 FT_DebugHook_Func debug_hooks[4];
932
933 #ifdef FT_CONFIG_OPTION_SUBPIXEL_RENDERING
934 FT_LcdFiveTapFilter lcd_weights; /* filter weights, if any */
935 FT_Bitmap_LcdFilterFunc lcd_filter_func; /* filtering callback */
936 #endif
937
938 #ifdef FT_CONFIG_OPTION_PIC
939 FT_PIC_Container pic_container;
940 #endif
941
942 FT_Int refcount;
943
944 } FT_LibraryRec;
945
946
947 FT_BASE( FT_Renderer )
948 FT_Lookup_Renderer( FT_Library library,
949 FT_Glyph_Format format,
950 FT_ListNode* node );
951
952 FT_BASE( FT_Error )
953 FT_Render_Glyph_Internal( FT_Library library,
954 FT_GlyphSlot slot,
955 FT_Render_Mode render_mode );
956
957 typedef const char*
958 (*FT_Face_GetPostscriptNameFunc)( FT_Face face );
959
960 typedef FT_Error
961 (*FT_Face_GetGlyphNameFunc)( FT_Face face,
962 FT_UInt glyph_index,
963 FT_Pointer buffer,
964 FT_UInt buffer_max );
965
966 typedef FT_UInt
967 (*FT_Face_GetGlyphNameIndexFunc)( FT_Face face,
968 FT_String* glyph_name );
969
970
971 #ifndef FT_CONFIG_OPTION_NO_DEFAULT_SYSTEM
972
973 /*************************************************************************/
974 /* */
975 /* <Function> */
976 /* FT_New_Memory */
977 /* */
978 /* <Description> */
979 /* Creates a new memory object. */
980 /* */
981 /* <Return> */
982 /* A pointer to the new memory object. 0 in case of error. */
983 /* */
984 FT_BASE( FT_Memory )
985 FT_New_Memory( void );
986
987
988 /*************************************************************************/
989 /* */
990 /* <Function> */
991 /* FT_Done_Memory */
992 /* */
993 /* <Description> */
994 /* Discards memory manager. */
995 /* */
996 /* <Input> */
997 /* memory :: A handle to the memory manager. */
998 /* */
999 FT_BASE( void )
1000 FT_Done_Memory( FT_Memory memory );
1001
1002 #endif /* !FT_CONFIG_OPTION_NO_DEFAULT_SYSTEM */
1003
1004
1005 /* Define default raster's interface. The default raster is located in */
1006 /* `src/base/ftraster.c'. */
1007 /* */
1008 /* Client applications can register new rasters through the */
1009 /* FT_Set_Raster() API. */
1010
1011 #ifndef FT_NO_DEFAULT_RASTER
1012 FT_EXPORT_VAR( FT_Raster_Funcs ) ft_default_raster;
1013 #endif
1014
1015
1016 /*************************************************************************/
1017 /*************************************************************************/
1018 /*************************************************************************/
1019 /**** ****/
1020 /**** ****/
1021 /**** P I C S U P P O R T ****/
1022 /**** ****/
1023 /**** ****/
1024 /*************************************************************************/
1025 /*************************************************************************/
1026 /*************************************************************************/
1027
1028
1029 /* PIC support macros for ftimage.h */
1030
1031
1032 /*************************************************************************/
1033 /* */
1034 /* <Macro> */
1035 /* FT_DEFINE_OUTLINE_FUNCS */
1036 /* */
1037 /* <Description> */
1038 /* Used to initialize an instance of FT_Outline_Funcs struct. */
1039 /* When FT_CONFIG_OPTION_PIC is defined an init function will need */
1040 /* to be called with a pre-allocated structure to be filled. */
1041 /* When FT_CONFIG_OPTION_PIC is not defined the struct will be */
1042 /* allocated in the global scope (or the scope where the macro */
1043 /* is used). */
1044 /* */
1045 #ifndef FT_CONFIG_OPTION_PIC
1046
1047 #define FT_DEFINE_OUTLINE_FUNCS( \
1048 class_, \
1049 move_to_, \
1050 line_to_, \
1051 conic_to_, \
1052 cubic_to_, \
1053 shift_, \
1054 delta_ ) \
1055 static const FT_Outline_Funcs class_ = \
1056 { \
1057 move_to_, \
1058 line_to_, \
1059 conic_to_, \
1060 cubic_to_, \
1061 shift_, \
1062 delta_ \
1063 };
1064
1065 #else /* FT_CONFIG_OPTION_PIC */
1066
1067 #define FT_DEFINE_OUTLINE_FUNCS( \
1068 class_, \
1069 move_to_, \
1070 line_to_, \
1071 conic_to_, \
1072 cubic_to_, \
1073 shift_, \
1074 delta_ ) \
1075 static FT_Error \
1076 Init_Class_ ## class_( FT_Outline_Funcs* clazz ) \
1077 { \
1078 clazz->move_to = move_to_; \
1079 clazz->line_to = line_to_; \
1080 clazz->conic_to = conic_to_; \
1081 clazz->cubic_to = cubic_to_; \
1082 clazz->shift = shift_; \
1083 clazz->delta = delta_; \
1084 \
1085 return FT_Err_Ok; \
1086 }
1087
1088 #endif /* FT_CONFIG_OPTION_PIC */
1089
1090
1091 /*************************************************************************/
1092 /* */
1093 /* <Macro> */
1094 /* FT_DEFINE_RASTER_FUNCS */
1095 /* */
1096 /* <Description> */
1097 /* Used to initialize an instance of FT_Raster_Funcs struct. */
1098 /* When FT_CONFIG_OPTION_PIC is defined an init function will need */
1099 /* to be called with a pre-allocated structure to be filled. */
1100 /* When FT_CONFIG_OPTION_PIC is not defined the struct will be */
1101 /* allocated in the global scope (or the scope where the macro */
1102 /* is used). */
1103 /* */
1104 #ifndef FT_CONFIG_OPTION_PIC
1105
1106 #define FT_DEFINE_RASTER_FUNCS( \
1107 class_, \
1108 glyph_format_, \
1109 raster_new_, \
1110 raster_reset_, \
1111 raster_set_mode_, \
1112 raster_render_, \
1113 raster_done_ ) \
1114 const FT_Raster_Funcs class_ = \
1115 { \
1116 glyph_format_, \
1117 raster_new_, \
1118 raster_reset_, \
1119 raster_set_mode_, \
1120 raster_render_, \
1121 raster_done_ \
1122 };
1123
1124 #else /* FT_CONFIG_OPTION_PIC */
1125
1126 #define FT_DEFINE_RASTER_FUNCS( \
1127 class_, \
1128 glyph_format_, \
1129 raster_new_, \
1130 raster_reset_, \
1131 raster_set_mode_, \
1132 raster_render_, \
1133 raster_done_ ) \
1134 void \
1135 FT_Init_Class_ ## class_( FT_Raster_Funcs* clazz ) \
1136 { \
1137 clazz->glyph_format = glyph_format_; \
1138 clazz->raster_new = raster_new_; \
1139 clazz->raster_reset = raster_reset_; \
1140 clazz->raster_set_mode = raster_set_mode_; \
1141 clazz->raster_render = raster_render_; \
1142 clazz->raster_done = raster_done_; \
1143 }
1144
1145 #endif /* FT_CONFIG_OPTION_PIC */
1146
1147
1148 /* PIC support macros for ftrender.h */
1149
1150
1151 /*************************************************************************/
1152 /* */
1153 /* <Macro> */
1154 /* FT_DEFINE_GLYPH */
1155 /* */
1156 /* <Description> */
1157 /* Used to initialize an instance of FT_Glyph_Class struct. */
1158 /* When FT_CONFIG_OPTION_PIC is defined an init function will need */
1159 /* to be called with a pre-allocated structure to be filled. */
1160 /* When FT_CONFIG_OPTION_PIC is not defined the struct will be */
1161 /* allocated in the global scope (or the scope where the macro */
1162 /* is used). */
1163 /* */
1164 #ifndef FT_CONFIG_OPTION_PIC
1165
1166 #define FT_DEFINE_GLYPH( \
1167 class_, \
1168 size_, \
1169 format_, \
1170 init_, \
1171 done_, \
1172 copy_, \
1173 transform_, \
1174 bbox_, \
1175 prepare_ ) \
1176 FT_CALLBACK_TABLE_DEF \
1177 const FT_Glyph_Class class_ = \
1178 { \
1179 size_, \
1180 format_, \
1181 init_, \
1182 done_, \
1183 copy_, \
1184 transform_, \
1185 bbox_, \
1186 prepare_ \
1187 };
1188
1189 #else /* FT_CONFIG_OPTION_PIC */
1190
1191 #define FT_DEFINE_GLYPH( \
1192 class_, \
1193 size_, \
1194 format_, \
1195 init_, \
1196 done_, \
1197 copy_, \
1198 transform_, \
1199 bbox_, \
1200 prepare_ ) \
1201 void \
1202 FT_Init_Class_ ## class_( FT_Glyph_Class* clazz ) \
1203 { \
1204 clazz->glyph_size = size_; \
1205 clazz->glyph_format = format_; \
1206 clazz->glyph_init = init_; \
1207 clazz->glyph_done = done_; \
1208 clazz->glyph_copy = copy_; \
1209 clazz->glyph_transform = transform_; \
1210 clazz->glyph_bbox = bbox_; \
1211 clazz->glyph_prepare = prepare_; \
1212 }
1213
1214 #endif /* FT_CONFIG_OPTION_PIC */
1215
1216
1217 /*************************************************************************/
1218 /* */
1219 /* <Macro> */
1220 /* FT_DECLARE_RENDERER */
1221 /* */
1222 /* <Description> */
1223 /* Used to create a forward declaration of a */
1224 /* FT_Renderer_Class struct instance. */
1225 /* */
1226 /* <Macro> */
1227 /* FT_DEFINE_RENDERER */
1228 /* */
1229 /* <Description> */
1230 /* Used to initialize an instance of FT_Renderer_Class struct. */
1231 /* */
1232 /* When FT_CONFIG_OPTION_PIC is defined a `create' function will */
1233 /* need to be called with a pointer where the allocated structure is */
1234 /* returned. And when it is no longer needed a `destroy' function */
1235 /* needs to be called to release that allocation. */
1236 /* `ftinit.c' (ft_create_default_module_classes) already contains */
1237 /* a mechanism to call these functions for the default modules */
1238 /* described in `ftmodule.h'. */
1239 /* */
1240 /* Notice that the created `create' and `destroy' functions call */
1241 /* `pic_init' and `pic_free' to allow you to manually allocate and */
1242 /* initialize any additional global data, like a module specific */
1243 /* interface, and put them in the global pic container defined in */
1244 /* `ftpic.h'. If you don't need them just implement the functions as */
1245 /* empty to resolve the link error. Also the `pic_init' and */
1246 /* `pic_free' functions should be declared in `pic.h', to be referred */
1247 /* by the renderer definition calling `FT_DEFINE_RENDERER' in the */
1248 /* following. */
1249 /* */
1250 /* When FT_CONFIG_OPTION_PIC is not defined the struct will be */
1251 /* allocated in the global scope (or the scope where the macro */
1252 /* is used). */
1253 /* */
1254 #ifndef FT_CONFIG_OPTION_PIC
1255
1256 #define FT_DECLARE_RENDERER( class_ ) \
1257 FT_EXPORT_VAR( const FT_Renderer_Class ) class_;
1258
1259 #define FT_DEFINE_RENDERER( \
1260 class_, \
1261 flags_, \
1262 size_, \
1263 name_, \
1264 version_, \
1265 requires_, \
1266 interface_, \
1267 init_, \
1268 done_, \
1269 get_interface_, \
1270 glyph_format_, \
1271 render_glyph_, \
1272 transform_glyph_, \
1273 get_glyph_cbox_, \
1274 set_mode_, \
1275 raster_class_ ) \
1278 { \
1279 FT_DEFINE_ROOT_MODULE( flags_, \
1280 size_, \
1281 name_, \
1282 version_, \
1283 requires_, \
1284 interface_, \
1285 init_, \
1286 done_, \
1287 get_interface_ ) \
1288 glyph_format_, \
1289 \
1290 render_glyph_, \
1291 transform_glyph_, \
1292 get_glyph_cbox_, \
1293 set_mode_, \
1294 \
1295 raster_class_ \
1296 };
1297
1298 #else /* FT_CONFIG_OPTION_PIC */
1299
1300 #define FT_DECLARE_RENDERER( class_ ) FT_DECLARE_MODULE( class_ )
1301
1302 #define FT_DEFINE_RENDERER( \
1303 class_, \
1304 flags_, \
1305 size_, \
1306 name_, \
1307 version_, \
1308 requires_, \
1309 interface_, \
1310 init_, \
1311 done_, \
1312 get_interface_, \
1313 glyph_format_, \
1314 render_glyph_, \
1315 transform_glyph_, \
1316 get_glyph_cbox_, \
1317 set_mode_, \
1318 raster_class_ ) \
1319 void \
1320 FT_Destroy_Class_ ## class_( FT_Library library, \
1321 FT_Module_Class* clazz ) \
1322 { \
1323 FT_Renderer_Class* rclazz = (FT_Renderer_Class*)clazz; \
1324 FT_Memory memory = library->memory; \
1325 \
1326 \
1327 class_ ## _pic_free( library ); \
1328 if ( rclazz ) \
1329 FT_FREE( rclazz ); \
1330 } \
1331 \
1332 \
1333 FT_Error \
1334 FT_Create_Class_ ## class_( FT_Library library, \
1335 FT_Module_Class** output_class ) \
1336 { \
1337 FT_Renderer_Class* clazz = NULL; \
1338 FT_Error error; \
1339 FT_Memory memory = library->memory; \
1340 \
1341 \
1342 if ( FT_ALLOC( clazz, sizeof ( *clazz ) ) ) \
1343 return error; \
1344 \
1345 error = class_ ## _pic_init( library ); \
1346 if ( error ) \
1347 { \
1348 FT_FREE( clazz ); \
1349 return error; \
1350 } \
1351 \
1352 FT_DEFINE_ROOT_MODULE( flags_, \
1353 size_, \
1354 name_, \
1355 version_, \
1356 requires_, \
1357 interface_, \
1358 init_, \
1359 done_, \
1360 get_interface_ ) \
1361 \
1362 clazz->glyph_format = glyph_format_; \
1363 \
1364 clazz->render_glyph = render_glyph_; \
1365 clazz->transform_glyph = transform_glyph_; \
1366 clazz->get_glyph_cbox = get_glyph_cbox_; \
1367 clazz->set_mode = set_mode_; \
1368 \
1369 clazz->raster_class = raster_class_; \
1370 \
1371 *output_class = (FT_Module_Class*)clazz; \
1372 \
1373 return FT_Err_Ok; \
1374 }
1375
1376 #endif /* FT_CONFIG_OPTION_PIC */
1377
1378
1379 /* PIC support macros for ftmodapi.h **/
1380
1381
1382 #ifdef FT_CONFIG_OPTION_PIC
1383
1384 /*************************************************************************/
1385 /* */
1386 /* <FuncType> */
1387 /* FT_Module_Creator */
1388 /* */
1389 /* <Description> */
1390 /* A function used to create (allocate) a new module class object. */
1391 /* The object's members are initialized, but the module itself is */
1392 /* not. */
1393 /* */
1394 /* <Input> */
1395 /* memory :: A handle to the memory manager. */
1396 /* output_class :: Initialized with the newly allocated class. */
1397 /* */
1398 typedef FT_Error
1399 (*FT_Module_Creator)( FT_Memory memory,
1400 FT_Module_Class** output_class );
1401
1402 /*************************************************************************/
1403 /* */
1404 /* <FuncType> */
1405 /* FT_Module_Destroyer */
1406 /* */
1407 /* <Description> */
1408 /* A function used to destroy (deallocate) a module class object. */
1409 /* */
1410 /* <Input> */
1411 /* memory :: A handle to the memory manager. */
1412 /* clazz :: Module class to destroy. */
1413 /* */
1414 typedef void
1415 (*FT_Module_Destroyer)( FT_Memory memory,
1416 FT_Module_Class* clazz );
1417
1418 #endif
1419
1420
1421 /*************************************************************************/
1422 /* */
1423 /* <Macro> */
1424 /* FT_DECLARE_MODULE */
1425 /* */
1426 /* <Description> */
1427 /* Used to create a forward declaration of a */
1428 /* FT_Module_Class struct instance. */
1429 /* */
1430 /* <Macro> */
1431 /* FT_DEFINE_MODULE */
1432 /* */
1433 /* <Description> */
1434 /* Used to initialize an instance of an FT_Module_Class struct. */
1435 /* */
1436 /* When FT_CONFIG_OPTION_PIC is defined a `create' function needs */
1437 /* to be called with a pointer where the allocated structure is */
1438 /* returned. And when it is no longer needed a `destroy' function */
1439 /* needs to be called to release that allocation. */
1440 /* `ftinit.c' (ft_create_default_module_classes) already contains */
1441 /* a mechanism to call these functions for the default modules */
1442 /* described in `ftmodule.h'. */
1443 /* */
1444 /* Notice that the created `create' and `destroy' functions call */
1445 /* `pic_init' and `pic_free' to allow you to manually allocate and */
1446 /* initialize any additional global data, like a module specific */
1447 /* interface, and put them in the global pic container defined in */
1448 /* `ftpic.h'. If you don't need them just implement the functions as */
1449 /* empty to resolve the link error. Also the `pic_init' and */
1450 /* `pic_free' functions should be declared in `pic.h', to be referred */
1451 /* by the module definition calling `FT_DEFINE_MODULE' in the */
1452 /* following. */
1453 /* */
1454 /* When FT_CONFIG_OPTION_PIC is not defined the struct will be */
1455 /* allocated in the global scope (or the scope where the macro */
1456 /* is used). */
1457 /* */
1458 /* <Macro> */
1459 /* FT_DEFINE_ROOT_MODULE */
1460 /* */
1461 /* <Description> */
1462 /* Used to initialize an instance of an FT_Module_Class struct inside */
1463 /* another struct that contains it or in a function that initializes */
1464 /* that containing struct. */
1465 /* */
1466 #ifndef FT_CONFIG_OPTION_PIC
1467
1468 #define FT_DECLARE_MODULE( class_ ) \
1469 FT_CALLBACK_TABLE \
1470 const FT_Module_Class class_;
1471
1472 #define FT_DEFINE_ROOT_MODULE( \
1473 flags_, \
1474 size_, \
1475 name_, \
1476 version_, \
1477 requires_, \
1478 interface_, \
1479 init_, \
1480 done_, \
1481 get_interface_ ) \
1482 { \
1483 flags_, \
1484 size_, \
1485 \
1486 name_, \
1487 version_, \
1504 interface_, \
1505 init_, \
1506 done_, \
1507 get_interface_ ) \
1508 FT_CALLBACK_TABLE_DEF \
1509 const FT_Module_Class class_ = \
1510 { \
1511 flags_, \
1512 size_, \
1513 \
1514 name_, \
1515 version_, \
1516 requires_, \
1517 \
1518 interface_, \
1519 \
1520 init_, \
1521 done_, \
1522 get_interface_, \
1523 };
1524
1525
1526 #else /* FT_CONFIG_OPTION_PIC */
1527
1528 #define FT_DECLARE_MODULE( class_ ) \
1529 FT_Error \
1530 FT_Create_Class_ ## class_( FT_Library library, \
1531 FT_Module_Class** output_class ); \
1532 void \
1533 FT_Destroy_Class_ ## class_( FT_Library library, \
1534 FT_Module_Class* clazz );
1535
1536 #define FT_DEFINE_ROOT_MODULE( \
1537 flags_, \
1538 size_, \
1539 name_, \
1540 version_, \
1541 requires_, \
1542 interface_, \
1543 init_, \
1544 done_, \
1545 get_interface_ ) \
1546 clazz->root.module_flags = flags_; \
1547 clazz->root.module_size = size_; \
1548 clazz->root.module_name = name_; \
1549 clazz->root.module_version = version_; \
1550 clazz->root.module_requires = requires_; \
1551 \
1552 clazz->root.module_interface = interface_; \
1553 \
1554 clazz->root.module_init = init_; \
1555 clazz->root.module_done = done_; \
1556 clazz->root.get_interface = get_interface_;
1557
1558 #define FT_DEFINE_MODULE( \
1559 class_, \
1560 flags_, \
1561 size_, \
1562 name_, \
1563 version_, \
1564 requires_, \
1565 interface_, \
1566 init_, \
1567 done_, \
1568 get_interface_ ) \
1569 void \
1570 FT_Destroy_Class_ ## class_( FT_Library library, \
1571 FT_Module_Class* clazz ) \
1572 { \
1573 FT_Memory memory = library->memory; \
1574 \
1575 \
1576 class_ ## _pic_free( library ); \
1577 if ( clazz ) \
1578 FT_FREE( clazz ); \
1579 } \
1580 \
1581 \
1582 FT_Error \
1583 FT_Create_Class_ ## class_( FT_Library library, \
1584 FT_Module_Class** output_class ) \
1585 { \
1586 FT_Memory memory = library->memory; \
1587 FT_Module_Class* clazz = NULL; \
1588 FT_Error error; \
1589 \
1590 \
1591 if ( FT_ALLOC( clazz, sizeof ( *clazz ) ) ) \
1592 return error; \
1593 error = class_ ## _pic_init( library ); \
1594 if ( error ) \
1595 { \
1596 FT_FREE( clazz ); \
1597 return error; \
1598 } \
1599 \
1600 clazz->module_flags = flags_; \
1601 clazz->module_size = size_; \
1602 clazz->module_name = name_; \
1603 clazz->module_version = version_; \
1604 clazz->module_requires = requires_; \
1605 \
1606 clazz->module_interface = interface_; \
1607 \
1608 clazz->module_init = init_; \
1609 clazz->module_done = done_; \
1610 clazz->get_interface = get_interface_; \
1611 \
1612 *output_class = clazz; \
1613 \
1614 return FT_Err_Ok; \
1615 }
1616
1617 #endif /* FT_CONFIG_OPTION_PIC */
1618
1619
1620 FT_END_HEADER
1621
1622 #endif /* FTOBJS_H_ */
1623
1624
1625 /* END */
|
1 /****************************************************************************
2 *
3 * ftobjs.h
4 *
5 * The FreeType private base classes (specification).
6 *
7 * Copyright (C) 1996-2019 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 /**************************************************************************
20 *
21 * This file contains the definition of all internal FreeType classes.
22 *
23 */
24
25
26 #ifndef FTOBJS_H_
27 #define FTOBJS_H_
28
29 #include <ft2build.h>
30 #include FT_RENDER_H
31 #include FT_SIZES_H
32 #include FT_LCD_FILTER_H
33 #include FT_INTERNAL_MEMORY_H
34 #include FT_INTERNAL_GLYPH_LOADER_H
35 #include FT_INTERNAL_DRIVER_H
36 #include FT_INTERNAL_AUTOHINT_H
37 #include FT_INTERNAL_SERVICE_H
38 #include FT_INTERNAL_CALC_H
39
40 #ifdef FT_CONFIG_OPTION_INCREMENTAL
41 #include FT_INCREMENTAL_H
42 #endif
43
44
45 FT_BEGIN_HEADER
46
47
48 /**************************************************************************
49 *
50 * Some generic definitions.
51 */
52 #ifndef TRUE
53 #define TRUE 1
54 #endif
55
56 #ifndef FALSE
57 #define FALSE 0
58 #endif
59
60 #ifndef NULL
61 #define NULL (void*)0
62 #endif
63
64
65 /**************************************************************************
66 *
67 * The min and max functions missing in C. As usual, be careful not to
68 * write things like FT_MIN( a++, b++ ) to avoid side effects.
69 */
70 #define FT_MIN( a, b ) ( (a) < (b) ? (a) : (b) )
71 #define FT_MAX( a, b ) ( (a) > (b) ? (a) : (b) )
72
73 #define FT_ABS( a ) ( (a) < 0 ? -(a) : (a) )
74
75 /*
76 * Approximate sqrt(x*x+y*y) using the `alpha max plus beta min' algorithm.
77 * We use alpha = 1, beta = 3/8, giving us results with a largest error
78 * less than 7% compared to the exact value.
79 */
80 #define FT_HYPOT( x, y ) \
81 ( x = FT_ABS( x ), \
82 y = FT_ABS( y ), \
83 x > y ? x + ( 3 * y >> 3 ) \
84 : y + ( 3 * x >> 3 ) )
85
86 /* we use FT_TYPEOF to suppress signedness compilation warnings */
87 #define FT_PAD_FLOOR( x, n ) ( (x) & ~FT_TYPEOF( x )( (n) - 1 ) )
88 #define FT_PAD_ROUND( x, n ) FT_PAD_FLOOR( (x) + (n) / 2, n )
89 #define FT_PAD_CEIL( x, n ) FT_PAD_FLOOR( (x) + (n) - 1, n )
90
91 #define FT_PIX_FLOOR( x ) ( (x) & ~FT_TYPEOF( x )63 )
92 #define FT_PIX_ROUND( x ) FT_PIX_FLOOR( (x) + 32 )
93 #define FT_PIX_CEIL( x ) FT_PIX_FLOOR( (x) + 63 )
94
95 /* specialized versions (for signed values) */
96 /* that don't produce run-time errors due to integer overflow */
97 #define FT_PAD_ROUND_LONG( x, n ) FT_PAD_FLOOR( ADD_LONG( (x), (n) / 2 ), \
98 n )
99 #define FT_PAD_CEIL_LONG( x, n ) FT_PAD_FLOOR( ADD_LONG( (x), (n) - 1 ), \
100 n )
101 #define FT_PIX_ROUND_LONG( x ) FT_PIX_FLOOR( ADD_LONG( (x), 32 ) )
102 #define FT_PIX_CEIL_LONG( x ) FT_PIX_FLOOR( ADD_LONG( (x), 63 ) )
103
104 #define FT_PAD_ROUND_INT32( x, n ) FT_PAD_FLOOR( ADD_INT32( (x), (n) / 2 ), \
105 n )
106 #define FT_PAD_CEIL_INT32( x, n ) FT_PAD_FLOOR( ADD_INT32( (x), (n) - 1 ), \
107 n )
108 #define FT_PIX_ROUND_INT32( x ) FT_PIX_FLOOR( ADD_INT32( (x), 32 ) )
109 #define FT_PIX_CEIL_INT32( x ) FT_PIX_FLOOR( ADD_INT32( (x), 63 ) )
110
111
112 /*
113 * character classification functions -- since these are used to parse font
114 * files, we must not use those in <ctypes.h> which are locale-dependent
115 */
116 #define ft_isdigit( x ) ( ( (unsigned)(x) - '0' ) < 10U )
117
118 #define ft_isxdigit( x ) ( ( (unsigned)(x) - '0' ) < 10U || \
119 ( (unsigned)(x) - 'a' ) < 6U || \
120 ( (unsigned)(x) - 'A' ) < 6U )
121
122 /* the next two macros assume ASCII representation */
123 #define ft_isupper( x ) ( ( (unsigned)(x) - 'A' ) < 26U )
124 #define ft_islower( x ) ( ( (unsigned)(x) - 'a' ) < 26U )
125
126 #define ft_isalpha( x ) ( ft_isupper( x ) || ft_islower( x ) )
127 #define ft_isalnum( x ) ( ft_isdigit( x ) || ft_isalpha( x ) )
128
129
130 /*************************************************************************/
131 /*************************************************************************/
132 /*************************************************************************/
133 /**** ****/
134 /**** ****/
168 (*FT_CMap_InitFunc)( FT_CMap cmap,
169 FT_Pointer init_data );
170
171 typedef void
172 (*FT_CMap_DoneFunc)( FT_CMap cmap );
173
174 typedef FT_UInt
175 (*FT_CMap_CharIndexFunc)( FT_CMap cmap,
176 FT_UInt32 char_code );
177
178 typedef FT_UInt
179 (*FT_CMap_CharNextFunc)( FT_CMap cmap,
180 FT_UInt32 *achar_code );
181
182 typedef FT_UInt
183 (*FT_CMap_CharVarIndexFunc)( FT_CMap cmap,
184 FT_CMap unicode_cmap,
185 FT_UInt32 char_code,
186 FT_UInt32 variant_selector );
187
188 typedef FT_Int
189 (*FT_CMap_CharVarIsDefaultFunc)( FT_CMap cmap,
190 FT_UInt32 char_code,
191 FT_UInt32 variant_selector );
192
193 typedef FT_UInt32 *
194 (*FT_CMap_VariantListFunc)( FT_CMap cmap,
195 FT_Memory mem );
196
197 typedef FT_UInt32 *
198 (*FT_CMap_CharVariantListFunc)( FT_CMap cmap,
199 FT_Memory mem,
200 FT_UInt32 char_code );
201
202 typedef FT_UInt32 *
203 (*FT_CMap_VariantCharListFunc)( FT_CMap cmap,
204 FT_Memory mem,
205 FT_UInt32 variant_selector );
206
207
208 typedef struct FT_CMap_ClassRec_
209 {
210 FT_ULong size;
211
212 FT_CMap_InitFunc init;
213 FT_CMap_DoneFunc done;
214 FT_CMap_CharIndexFunc char_index;
215 FT_CMap_CharNextFunc char_next;
216
217 /* Subsequent entries are special ones for format 14 -- the variant */
218 /* selector subtable which behaves like no other */
219
220 FT_CMap_CharVarIndexFunc char_var_index;
221 FT_CMap_CharVarIsDefaultFunc char_var_default;
222 FT_CMap_VariantListFunc variant_list;
223 FT_CMap_CharVariantListFunc charvariant_list;
224 FT_CMap_VariantCharListFunc variantchar_list;
225
226 } FT_CMap_ClassRec;
227
228
229 #define FT_DECLARE_CMAP_CLASS( class_ ) \
230 FT_CALLBACK_TABLE const FT_CMap_ClassRec class_;
231
232 #define FT_DEFINE_CMAP_CLASS( \
233 class_, \
234 size_, \
235 init_, \
236 done_, \
237 char_index_, \
238 char_next_, \
239 char_var_index_, \
240 char_var_default_, \
241 variant_list_, \
242 charvariant_list_, \
243 variantchar_list_ ) \
244 FT_CALLBACK_TABLE_DEF \
245 const FT_CMap_ClassRec class_ = \
246 { \
247 size_, \
248 init_, \
249 done_, \
250 char_index_, \
251 char_next_, \
252 char_var_index_, \
253 char_var_default_, \
254 variant_list_, \
255 charvariant_list_, \
256 variantchar_list_ \
257 };
258
259
260 /* create a new charmap and add it to charmap->face */
261 FT_BASE( FT_Error )
262 FT_CMap_New( FT_CMap_Class clazz,
263 FT_Pointer init_data,
264 FT_CharMap charmap,
265 FT_CMap *acmap );
266
267 /* destroy a charmap and remove it from face's list */
268 FT_BASE( void )
269 FT_CMap_Done( FT_CMap cmap );
270
271
272 /* add LCD padding to CBox */
273 FT_BASE( void )
274 ft_lcd_padding( FT_BBox* cbox,
275 FT_GlyphSlot slot,
276 FT_Render_Mode mode );
277
278 #ifdef FT_CONFIG_OPTION_SUBPIXEL_RENDERING
279
280 typedef void (*FT_Bitmap_LcdFilterFunc)( FT_Bitmap* bitmap,
281 FT_Render_Mode render_mode,
282 FT_Byte* weights );
283
284
285 /* This is the default LCD filter, an in-place, 5-tap FIR filter. */
286 FT_BASE( void )
287 ft_lcd_filter_fir( FT_Bitmap* bitmap,
288 FT_Render_Mode mode,
289 FT_LcdFiveTapFilter weights );
290
291 #endif /* FT_CONFIG_OPTION_SUBPIXEL_RENDERING */
292
293 /**************************************************************************
294 *
295 * @struct:
296 * FT_Face_InternalRec
297 *
298 * @description:
299 * This structure contains the internal fields of each FT_Face object.
300 * These fields may change between different releases of FreeType.
301 *
302 * @fields:
303 * max_points ::
304 * The maximum number of points used to store the vectorial outline of
305 * any glyph in this face. If this value cannot be known in advance,
306 * or if the face isn't scalable, this should be set to 0. Only
307 * relevant for scalable formats.
308 *
309 * max_contours ::
310 * The maximum number of contours used to store the vectorial outline
311 * of any glyph in this face. If this value cannot be known in
312 * advance, or if the face isn't scalable, this should be set to 0.
313 * Only relevant for scalable formats.
314 *
315 * transform_matrix ::
316 * A 2x2 matrix of 16.16 coefficients used to transform glyph outlines
317 * after they are loaded from the font. Only used by the convenience
318 * functions.
319 *
320 * transform_delta ::
321 * A translation vector used to transform glyph outlines after they are
322 * loaded from the font. Only used by the convenience functions.
323 *
324 * transform_flags ::
325 * Some flags used to classify the transform. Only used by the
326 * convenience functions.
327 *
328 * services ::
329 * A cache for frequently used services. It should be only accessed
330 * with the macro `FT_FACE_LOOKUP_SERVICE`.
331 *
332 * incremental_interface ::
333 * If non-null, the interface through which glyph data and metrics are
334 * loaded incrementally for faces that do not provide all of this data
335 * when first opened. This field exists only if
336 * @FT_CONFIG_OPTION_INCREMENTAL is defined.
337 *
338 * no_stem_darkening ::
339 * Overrides the module-level default, see @stem-darkening[cff], for
340 * example. FALSE and TRUE toggle stem darkening on and off,
341 * respectively, value~-1 means to use the module/driver default.
342 *
343 * random_seed ::
344 * If positive, override the seed value for the CFF 'random' operator.
345 * Value~0 means to use the font's value. Value~-1 means to use the
346 * CFF driver's default.
347 *
348 * lcd_weights ::
349 * lcd_filter_func ::
350 * These fields specify the LCD filtering weights and callback function
351 * for ClearType-style subpixel rendering.
352 *
353 * refcount ::
354 * A counter initialized to~1 at the time an @FT_Face structure is
355 * created. @FT_Reference_Face increments this counter, and
356 * @FT_Done_Face only destroys a face if the counter is~1, otherwise it
357 * simply decrements it.
358 */
359 typedef struct FT_Face_InternalRec_
360 {
361 FT_Matrix transform_matrix;
362 FT_Vector transform_delta;
363 FT_Int transform_flags;
364
365 FT_ServiceCacheRec services;
366
367 #ifdef FT_CONFIG_OPTION_INCREMENTAL
368 FT_Incremental_InterfaceRec* incremental_interface;
369 #endif
370
371 FT_Char no_stem_darkening;
372 FT_Int32 random_seed;
373
374 #ifdef FT_CONFIG_OPTION_SUBPIXEL_RENDERING
375 FT_LcdFiveTapFilter lcd_weights; /* filter weights, if any */
376 FT_Bitmap_LcdFilterFunc lcd_filter_func; /* filtering callback */
377 #endif
378
379 FT_Int refcount;
380
381 } FT_Face_InternalRec;
382
383
384 /**************************************************************************
385 *
386 * @struct:
387 * FT_Slot_InternalRec
388 *
389 * @description:
390 * This structure contains the internal fields of each FT_GlyphSlot
391 * object. These fields may change between different releases of
392 * FreeType.
393 *
394 * @fields:
395 * loader ::
396 * The glyph loader object used to load outlines into the glyph slot.
397 *
398 * flags ::
399 * Possible values are zero or FT_GLYPH_OWN_BITMAP. The latter
400 * indicates that the FT_GlyphSlot structure owns the bitmap buffer.
401 *
402 * glyph_transformed ::
403 * Boolean. Set to TRUE when the loaded glyph must be transformed
404 * through a specific font transformation. This is _not_ the same as
405 * the face transform set through FT_Set_Transform().
406 *
407 * glyph_matrix ::
408 * The 2x2 matrix corresponding to the glyph transformation, if
409 * necessary.
410 *
411 * glyph_delta ::
412 * The 2d translation vector corresponding to the glyph transformation,
413 * if necessary.
414 *
415 * glyph_hints ::
416 * Format-specific glyph hints management.
417 *
418 * load_flags ::
419 * The load flags passed as an argument to @FT_Load_Glyph while
420 * initializing the glyph slot.
421 */
422
423 #define FT_GLYPH_OWN_BITMAP 0x1U
424
425 typedef struct FT_Slot_InternalRec_
426 {
427 FT_GlyphLoader loader;
428 FT_UInt flags;
429 FT_Bool glyph_transformed;
430 FT_Matrix glyph_matrix;
431 FT_Vector glyph_delta;
432 void* glyph_hints;
433
434 FT_Int32 load_flags;
435
436 } FT_GlyphSlot_InternalRec;
437
438
439 /**************************************************************************
440 *
441 * @struct:
442 * FT_Size_InternalRec
443 *
444 * @description:
445 * This structure contains the internal fields of each FT_Size object.
446 *
447 * @fields:
448 * module_data ::
449 * Data specific to a driver module.
450 *
451 * autohint_mode ::
452 * The used auto-hinting mode.
453 *
454 * autohint_metrics ::
455 * Metrics used by the auto-hinter.
456 *
457 */
458
459 typedef struct FT_Size_InternalRec_
460 {
461 void* module_data;
462
463 FT_Render_Mode autohint_mode;
464 FT_Size_Metrics autohint_metrics;
465
466 } FT_Size_InternalRec;
467
468
469 /*************************************************************************/
470 /*************************************************************************/
471 /*************************************************************************/
472 /**** ****/
473 /**** ****/
474 /**** M O D U L E S ****/
475 /**** ****/
476 /**** ****/
477 /*************************************************************************/
478 /*************************************************************************/
479 /*************************************************************************/
480
481
482 /**************************************************************************
483 *
484 * @struct:
485 * FT_ModuleRec
486 *
487 * @description:
488 * A module object instance.
489 *
490 * @fields:
491 * clazz ::
492 * A pointer to the module's class.
493 *
494 * library ::
495 * A handle to the parent library object.
496 *
497 * memory ::
498 * A handle to the memory manager.
499 */
500 typedef struct FT_ModuleRec_
501 {
502 FT_Module_Class* clazz;
503 FT_Library library;
504 FT_Memory memory;
505
506 } FT_ModuleRec;
507
508
509 /* typecast an object to an FT_Module */
510 #define FT_MODULE( x ) ( (FT_Module)(x) )
511
512 #define FT_MODULE_CLASS( x ) FT_MODULE( x )->clazz
513 #define FT_MODULE_LIBRARY( x ) FT_MODULE( x )->library
514 #define FT_MODULE_MEMORY( x ) FT_MODULE( x )->memory
515
516
517 #define FT_MODULE_IS_DRIVER( x ) ( FT_MODULE_CLASS( x )->module_flags & \
518 FT_MODULE_FONT_DRIVER )
519
522
523 #define FT_MODULE_IS_HINTER( x ) ( FT_MODULE_CLASS( x )->module_flags & \
524 FT_MODULE_HINTER )
525
526 #define FT_MODULE_IS_STYLER( x ) ( FT_MODULE_CLASS( x )->module_flags & \
527 FT_MODULE_STYLER )
528
529 #define FT_DRIVER_IS_SCALABLE( x ) ( FT_MODULE_CLASS( x )->module_flags & \
530 FT_MODULE_DRIVER_SCALABLE )
531
532 #define FT_DRIVER_USES_OUTLINES( x ) !( FT_MODULE_CLASS( x )->module_flags & \
533 FT_MODULE_DRIVER_NO_OUTLINES )
534
535 #define FT_DRIVER_HAS_HINTER( x ) ( FT_MODULE_CLASS( x )->module_flags & \
536 FT_MODULE_DRIVER_HAS_HINTER )
537
538 #define FT_DRIVER_HINTS_LIGHTLY( x ) ( FT_MODULE_CLASS( x )->module_flags & \
539 FT_MODULE_DRIVER_HINTS_LIGHTLY )
540
541
542 /**************************************************************************
543 *
544 * @function:
545 * FT_Get_Module_Interface
546 *
547 * @description:
548 * Finds a module and returns its specific interface as a typeless
549 * pointer.
550 *
551 * @input:
552 * library ::
553 * A handle to the library object.
554 *
555 * module_name ::
556 * The module's name (as an ASCII string).
557 *
558 * @return:
559 * A module-specific interface if available, 0 otherwise.
560 *
561 * @note:
562 * You should better be familiar with FreeType internals to know which
563 * module to look for, and what its interface is :-)
564 */
565 FT_BASE( const void* )
566 FT_Get_Module_Interface( FT_Library library,
567 const char* mod_name );
568
569 FT_BASE( FT_Pointer )
570 ft_module_get_service( FT_Module module,
571 const char* service_id,
572 FT_Bool global );
573
574 #ifdef FT_CONFIG_OPTION_ENVIRONMENT_PROPERTIES
575 FT_BASE( FT_Error )
576 ft_property_string_set( FT_Library library,
577 const FT_String* module_name,
578 const FT_String* property_name,
579 FT_String* value );
580 #endif
581
582 /* */
583
584
595 /*************************************************************************/
596
597 /* a few macros used to perform easy typecasts with minimal brain damage */
598
599 #define FT_FACE( x ) ( (FT_Face)(x) )
600 #define FT_SIZE( x ) ( (FT_Size)(x) )
601 #define FT_SLOT( x ) ( (FT_GlyphSlot)(x) )
602
603 #define FT_FACE_DRIVER( x ) FT_FACE( x )->driver
604 #define FT_FACE_LIBRARY( x ) FT_FACE_DRIVER( x )->root.library
605 #define FT_FACE_MEMORY( x ) FT_FACE( x )->memory
606 #define FT_FACE_STREAM( x ) FT_FACE( x )->stream
607
608 #define FT_SIZE_FACE( x ) FT_SIZE( x )->face
609 #define FT_SLOT_FACE( x ) FT_SLOT( x )->face
610
611 #define FT_FACE_SLOT( x ) FT_FACE( x )->glyph
612 #define FT_FACE_SIZE( x ) FT_FACE( x )->size
613
614
615 /**************************************************************************
616 *
617 * @function:
618 * FT_New_GlyphSlot
619 *
620 * @description:
621 * It is sometimes useful to have more than one glyph slot for a given
622 * face object. This function is used to create additional slots. All
623 * of them are automatically discarded when the face is destroyed.
624 *
625 * @input:
626 * face ::
627 * A handle to a parent face object.
628 *
629 * @output:
630 * aslot ::
631 * A handle to a new glyph slot object.
632 *
633 * @return:
634 * FreeType error code. 0 means success.
635 */
636 FT_BASE( FT_Error )
637 FT_New_GlyphSlot( FT_Face face,
638 FT_GlyphSlot *aslot );
639
640
641 /**************************************************************************
642 *
643 * @function:
644 * FT_Done_GlyphSlot
645 *
646 * @description:
647 * Destroys a given glyph slot. Remember however that all slots are
648 * automatically destroyed with its parent. Using this function is not
649 * always mandatory.
650 *
651 * @input:
652 * slot ::
653 * A handle to a target glyph slot.
654 */
655 FT_BASE( void )
656 FT_Done_GlyphSlot( FT_GlyphSlot slot );
657
658 /* */
659
660 #define FT_REQUEST_WIDTH( req ) \
661 ( (req)->horiResolution \
662 ? ( (req)->width * (FT_Pos)(req)->horiResolution + 36 ) / 72 \
663 : (req)->width )
664
665 #define FT_REQUEST_HEIGHT( req ) \
666 ( (req)->vertResolution \
667 ? ( (req)->height * (FT_Pos)(req)->vertResolution + 36 ) / 72 \
668 : (req)->height )
669
670
671 /* Set the metrics according to a bitmap strike. */
672 FT_BASE( void )
673 FT_Select_Metrics( FT_Face face,
674 FT_ULong strike_index );
684 FT_BASE( FT_Error )
685 FT_Match_Size( FT_Face face,
686 FT_Size_Request req,
687 FT_Bool ignore_width,
688 FT_ULong* size_index );
689
690
691 /* Use the horizontal metrics to synthesize the vertical metrics. */
692 /* If `advance' is zero, it is also synthesized. */
693 FT_BASE( void )
694 ft_synthesize_vertical_metrics( FT_Glyph_Metrics* metrics,
695 FT_Pos advance );
696
697
698 /* Free the bitmap of a given glyphslot when needed (i.e., only when it */
699 /* was allocated with ft_glyphslot_alloc_bitmap). */
700 FT_BASE( void )
701 ft_glyphslot_free_bitmap( FT_GlyphSlot slot );
702
703
704 /* Preset bitmap metrics of an outline glyphslot prior to rendering */
705 /* and check whether the truncated bbox is too large for rendering. */
706 FT_BASE( FT_Bool )
707 ft_glyphslot_preset_bitmap( FT_GlyphSlot slot,
708 FT_Render_Mode mode,
709 const FT_Vector* origin );
710
711 /* Allocate a new bitmap buffer in a glyph slot. */
712 FT_BASE( FT_Error )
713 ft_glyphslot_alloc_bitmap( FT_GlyphSlot slot,
714 FT_ULong size );
715
716
717 /* Set the bitmap buffer in a glyph slot to a given pointer. The buffer */
718 /* will not be freed by a later call to ft_glyphslot_free_bitmap. */
719 FT_BASE( void )
720 ft_glyphslot_set_bitmap( FT_GlyphSlot slot,
721 FT_Byte* buffer );
722
723
724 /*************************************************************************/
725 /*************************************************************************/
726 /*************************************************************************/
757 /*************************************************************************/
758 /*************************************************************************/
759 /*************************************************************************/
760 /**** ****/
761 /**** ****/
762 /**** F O N T D R I V E R S ****/
763 /**** ****/
764 /**** ****/
765 /*************************************************************************/
766 /*************************************************************************/
767 /*************************************************************************/
768
769
770 /* typecast a module into a driver easily */
771 #define FT_DRIVER( x ) ( (FT_Driver)(x) )
772
773 /* typecast a module as a driver, and get its driver class */
774 #define FT_DRIVER_CLASS( x ) FT_DRIVER( x )->clazz
775
776
777 /**************************************************************************
778 *
779 * @struct:
780 * FT_DriverRec
781 *
782 * @description:
783 * The root font driver class. A font driver is responsible for managing
784 * and loading font files of a given format.
785 *
786 * @fields:
787 * root ::
788 * Contains the fields of the root module class.
789 *
790 * clazz ::
791 * A pointer to the font driver's class. Note that this is NOT
792 * root.clazz. 'class' wasn't used as it is a reserved word in C++.
793 *
794 * faces_list ::
795 * The list of faces currently opened by this driver.
796 *
797 * glyph_loader ::
798 * Unused. Used to be glyph loader for all faces managed by this
799 * driver.
800 */
801 typedef struct FT_DriverRec_
802 {
803 FT_ModuleRec root;
804 FT_Driver_Class clazz;
805 FT_ListRec faces_list;
806 FT_GlyphLoader glyph_loader;
807
808 } FT_DriverRec;
809
810
811 /*************************************************************************/
812 /*************************************************************************/
813 /*************************************************************************/
814 /**** ****/
815 /**** ****/
816 /**** L I B R A R I E S ****/
817 /**** ****/
818 /**** ****/
819 /*************************************************************************/
820 /*************************************************************************/
821 /*************************************************************************/
822
823
824 /**************************************************************************
825 *
826 * @struct:
827 * FT_LibraryRec
828 *
829 * @description:
830 * The FreeType library class. This is the root of all FreeType data.
831 * Use FT_New_Library() to create a library object, and FT_Done_Library()
832 * to discard it and all child objects.
833 *
834 * @fields:
835 * memory ::
836 * The library's memory object. Manages memory allocation.
837 *
838 * version_major ::
839 * The major version number of the library.
840 *
841 * version_minor ::
842 * The minor version number of the library.
843 *
844 * version_patch ::
845 * The current patch level of the library.
846 *
847 * num_modules ::
848 * The number of modules currently registered within this library.
849 * This is set to 0 for new libraries. New modules are added through
850 * the FT_Add_Module() API function.
851 *
852 * modules ::
853 * A table used to store handles to the currently registered
854 * modules. Note that each font driver contains a list of its opened
855 * faces.
856 *
857 * renderers ::
858 * The list of renderers currently registered within the library.
859 *
860 * cur_renderer ::
861 * The current outline renderer. This is a shortcut used to avoid
862 * parsing the list on each call to FT_Outline_Render(). It is a
863 * handle to the current renderer for the FT_GLYPH_FORMAT_OUTLINE
864 * format.
865 *
866 * auto_hinter ::
867 * The auto-hinter module interface.
868 *
869 * debug_hooks ::
870 * An array of four function pointers that allow debuggers to hook into
871 * a font format's interpreter. Currently, only the TrueType bytecode
872 * debugger uses this.
873 *
874 * lcd_weights ::
875 * The LCD filter weights for ClearType-style subpixel rendering.
876 *
877 * lcd_filter_func ::
878 * The LCD filtering callback function for for ClearType-style subpixel
879 * rendering.
880 *
881 * lcd_geometry ::
882 * This array specifies LCD subpixel geometry and controls Harmony LCD
883 * rendering technique, alternative to ClearType.
884 *
885 * pic_container ::
886 * Contains global structs and tables, instead of defining them
887 * globally.
888 *
889 * refcount ::
890 * A counter initialized to~1 at the time an @FT_Library structure is
891 * created. @FT_Reference_Library increments this counter, and
892 * @FT_Done_Library only destroys a library if the counter is~1,
893 * otherwise it simply decrements it.
894 */
895 typedef struct FT_LibraryRec_
896 {
897 FT_Memory memory; /* library's memory manager */
898
899 FT_Int version_major;
900 FT_Int version_minor;
901 FT_Int version_patch;
902
903 FT_UInt num_modules;
904 FT_Module modules[FT_MAX_MODULES]; /* module objects */
905
906 FT_ListRec renderers; /* list of renderers */
907 FT_Renderer cur_renderer; /* current outline renderer */
908 FT_Module auto_hinter;
909
910 FT_DebugHook_Func debug_hooks[4];
911
912 #ifdef FT_CONFIG_OPTION_SUBPIXEL_RENDERING
913 FT_LcdFiveTapFilter lcd_weights; /* filter weights, if any */
914 FT_Bitmap_LcdFilterFunc lcd_filter_func; /* filtering callback */
915 #else
916 FT_Vector lcd_geometry[3]; /* RGB subpixel positions */
917 #endif
918
919 FT_Int refcount;
920
921 } FT_LibraryRec;
922
923
924 FT_BASE( FT_Renderer )
925 FT_Lookup_Renderer( FT_Library library,
926 FT_Glyph_Format format,
927 FT_ListNode* node );
928
929 FT_BASE( FT_Error )
930 FT_Render_Glyph_Internal( FT_Library library,
931 FT_GlyphSlot slot,
932 FT_Render_Mode render_mode );
933
934 typedef const char*
935 (*FT_Face_GetPostscriptNameFunc)( FT_Face face );
936
937 typedef FT_Error
938 (*FT_Face_GetGlyphNameFunc)( FT_Face face,
939 FT_UInt glyph_index,
940 FT_Pointer buffer,
941 FT_UInt buffer_max );
942
943 typedef FT_UInt
944 (*FT_Face_GetGlyphNameIndexFunc)( FT_Face face,
945 FT_String* glyph_name );
946
947
948 #ifndef FT_CONFIG_OPTION_NO_DEFAULT_SYSTEM
949
950 /**************************************************************************
951 *
952 * @function:
953 * FT_New_Memory
954 *
955 * @description:
956 * Creates a new memory object.
957 *
958 * @return:
959 * A pointer to the new memory object. 0 in case of error.
960 */
961 FT_BASE( FT_Memory )
962 FT_New_Memory( void );
963
964
965 /**************************************************************************
966 *
967 * @function:
968 * FT_Done_Memory
969 *
970 * @description:
971 * Discards memory manager.
972 *
973 * @input:
974 * memory ::
975 * A handle to the memory manager.
976 */
977 FT_BASE( void )
978 FT_Done_Memory( FT_Memory memory );
979
980 #endif /* !FT_CONFIG_OPTION_NO_DEFAULT_SYSTEM */
981
982
983 /* Define default raster's interface. The default raster is located in */
984 /* `src/base/ftraster.c'. */
985 /* */
986 /* Client applications can register new rasters through the */
987 /* FT_Set_Raster() API. */
988
989 #ifndef FT_NO_DEFAULT_RASTER
990 FT_EXPORT_VAR( FT_Raster_Funcs ) ft_default_raster;
991 #endif
992
993
994 /**************************************************************************
995 *
996 * @macro:
997 * FT_DEFINE_OUTLINE_FUNCS
998 *
999 * @description:
1000 * Used to initialize an instance of FT_Outline_Funcs struct. The struct
1001 * will be allocated in the global scope (or the scope where the macro is
1002 * used).
1003 */
1004 #define FT_DEFINE_OUTLINE_FUNCS( \
1005 class_, \
1006 move_to_, \
1007 line_to_, \
1008 conic_to_, \
1009 cubic_to_, \
1010 shift_, \
1011 delta_ ) \
1012 static const FT_Outline_Funcs class_ = \
1013 { \
1014 move_to_, \
1015 line_to_, \
1016 conic_to_, \
1017 cubic_to_, \
1018 shift_, \
1019 delta_ \
1020 };
1021
1022
1023 /**************************************************************************
1024 *
1025 * @macro:
1026 * FT_DEFINE_RASTER_FUNCS
1027 *
1028 * @description:
1029 * Used to initialize an instance of FT_Raster_Funcs struct. The struct
1030 * will be allocated in the global scope (or the scope where the macro is
1031 * used).
1032 */
1033 #define FT_DEFINE_RASTER_FUNCS( \
1034 class_, \
1035 glyph_format_, \
1036 raster_new_, \
1037 raster_reset_, \
1038 raster_set_mode_, \
1039 raster_render_, \
1040 raster_done_ ) \
1041 const FT_Raster_Funcs class_ = \
1042 { \
1043 glyph_format_, \
1044 raster_new_, \
1045 raster_reset_, \
1046 raster_set_mode_, \
1047 raster_render_, \
1048 raster_done_ \
1049 };
1050
1051
1052
1053 /**************************************************************************
1054 *
1055 * @macro:
1056 * FT_DEFINE_GLYPH
1057 *
1058 * @description:
1059 * The struct will be allocated in the global scope (or the scope where
1060 * the macro is used).
1061 */
1062 #define FT_DEFINE_GLYPH( \
1063 class_, \
1064 size_, \
1065 format_, \
1066 init_, \
1067 done_, \
1068 copy_, \
1069 transform_, \
1070 bbox_, \
1071 prepare_ ) \
1072 FT_CALLBACK_TABLE_DEF \
1073 const FT_Glyph_Class class_ = \
1074 { \
1075 size_, \
1076 format_, \
1077 init_, \
1078 done_, \
1079 copy_, \
1080 transform_, \
1081 bbox_, \
1082 prepare_ \
1083 };
1084
1085
1086 /**************************************************************************
1087 *
1088 * @macro:
1089 * FT_DECLARE_RENDERER
1090 *
1091 * @description:
1092 * Used to create a forward declaration of a FT_Renderer_Class struct
1093 * instance.
1094 *
1095 * @macro:
1096 * FT_DEFINE_RENDERER
1097 *
1098 * @description:
1099 * Used to initialize an instance of FT_Renderer_Class struct.
1100 *
1101 * The struct will be allocated in the global scope (or the scope where
1102 * the macro is used).
1103 */
1104 #define FT_DECLARE_RENDERER( class_ ) \
1105 FT_EXPORT_VAR( const FT_Renderer_Class ) class_;
1106
1107 #define FT_DEFINE_RENDERER( \
1108 class_, \
1109 flags_, \
1110 size_, \
1111 name_, \
1112 version_, \
1113 requires_, \
1114 interface_, \
1115 init_, \
1116 done_, \
1117 get_interface_, \
1118 glyph_format_, \
1119 render_glyph_, \
1120 transform_glyph_, \
1121 get_glyph_cbox_, \
1122 set_mode_, \
1123 raster_class_ ) \
1126 { \
1127 FT_DEFINE_ROOT_MODULE( flags_, \
1128 size_, \
1129 name_, \
1130 version_, \
1131 requires_, \
1132 interface_, \
1133 init_, \
1134 done_, \
1135 get_interface_ ) \
1136 glyph_format_, \
1137 \
1138 render_glyph_, \
1139 transform_glyph_, \
1140 get_glyph_cbox_, \
1141 set_mode_, \
1142 \
1143 raster_class_ \
1144 };
1145
1146
1147 /**************************************************************************
1148 *
1149 * @macro:
1150 * FT_DECLARE_MODULE
1151 *
1152 * @description:
1153 * Used to create a forward declaration of a FT_Module_Class struct
1154 * instance.
1155 *
1156 * @macro:
1157 * FT_DEFINE_MODULE
1158 *
1159 * @description:
1160 * Used to initialize an instance of an FT_Module_Class struct.
1161 *
1162 * The struct will be allocated in the global scope (or the scope where
1163 * the macro is used).
1164 *
1165 * @macro:
1166 * FT_DEFINE_ROOT_MODULE
1167 *
1168 * @description:
1169 * Used to initialize an instance of an FT_Module_Class struct inside
1170 * another struct that contains it or in a function that initializes that
1171 * containing struct.
1172 */
1173 #define FT_DECLARE_MODULE( class_ ) \
1174 FT_CALLBACK_TABLE \
1175 const FT_Module_Class class_;
1176
1177 #define FT_DEFINE_ROOT_MODULE( \
1178 flags_, \
1179 size_, \
1180 name_, \
1181 version_, \
1182 requires_, \
1183 interface_, \
1184 init_, \
1185 done_, \
1186 get_interface_ ) \
1187 { \
1188 flags_, \
1189 size_, \
1190 \
1191 name_, \
1192 version_, \
1209 interface_, \
1210 init_, \
1211 done_, \
1212 get_interface_ ) \
1213 FT_CALLBACK_TABLE_DEF \
1214 const FT_Module_Class class_ = \
1215 { \
1216 flags_, \
1217 size_, \
1218 \
1219 name_, \
1220 version_, \
1221 requires_, \
1222 \
1223 interface_, \
1224 \
1225 init_, \
1226 done_, \
1227 get_interface_, \
1228 };
1229
1230
1231 FT_END_HEADER
1232
1233 #endif /* FTOBJS_H_ */
1234
1235
1236 /* END */
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