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comparison: modules/freetype2/include/ftmodapi.h

modules/freetype2/include/ftmodapi.h

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1 /***************************************************************************/
2 /* */
3 /* ftmodapi.h */
4 /* */
5 /* FreeType modules public interface (specification). */
6 /* */
7 /* Copyright 1996-2003, 2006, 2008-2010, 2012, 2013 by */
8 /* David Turner, Robert Wilhelm, and Werner Lemberg. */
9 /* */
10 /* This file is part of the FreeType project, and may only be used, */
11 /* modified, and distributed under the terms of the FreeType project */
12 /* license, LICENSE.TXT. By continuing to use, modify, or distribute */
13 /* this file you indicate that you have read the license and */
14 /* understand and accept it fully. */
15 /* */
16 /***************************************************************************/
17
18
19 #ifndef __FTMODAPI_H__
20 #define __FTMODAPI_H__
21
22
23 #include <ft2build.h>
24 #include FT_FREETYPE_H
25
26 #ifdef FREETYPE_H
27 #error "freetype.h of FreeType 1 has been loaded!"
28 #error "Please fix the directory search order for header files"
29 #error "so that freetype.h of FreeType 2 is found first."
30 #endif
31
32
33 FT_BEGIN_HEADER
34
35
36 /*************************************************************************/
37 /* */
38 /* <Section> */
39 /* module_management */
40 /* */
41 /* <Title> */
42 /* Module Management */
43 /* */
44 /* <Abstract> */
45 /* How to add, upgrade, remove, and control modules from FreeType. */
46 /* */
47 /* <Description> */
48 /* The definitions below are used to manage modules within FreeType. */
49 /* Modules can be added, upgraded, and removed at runtime. */
50 /* Additionally, some module properties can be controlled also. */
51 /* */
52 /* Here is a list of possible values of the `module_name' field in */
53 /* the @FT_Module_Class structure. */
54 /* */
55 /* { */
56 /* autofitter */
57 /* bdf */
58 /* cff */
59 /* gxvalid */
60 /* otvalid */
61 /* pcf */
62 /* pfr */
63 /* psaux */
64 /* pshinter */
65 /* psnames */
66 /* raster1, raster5 */
67 /* sfnt */
68 /* smooth, smooth-lcd, smooth-lcdv */
69 /* truetype */
70 /* type1 */
71 /* type42 */
72 /* t1cid */
73 /* winfonts */
74 /* } */
75 /* */
76 /* Note that the FreeType Cache sub-system is not a FreeType module. */
77 /* */
78 /*************************************************************************/
79
80
81 /* module bit flags */
82 #define FT_MODULE_FONT_DRIVER 1 /* this module is a font driver */
83 #define FT_MODULE_RENDERER 2 /* this module is a renderer */
84 #define FT_MODULE_HINTER 4 /* this module is a glyph hinter */
85 #define FT_MODULE_STYLER 8 /* this module is a styler */
86
87 #define FT_MODULE_DRIVER_SCALABLE 0x100 /* the driver supports */
88 /* scalable fonts */
89 #define FT_MODULE_DRIVER_NO_OUTLINES 0x200 /* the driver does not */
90 /* support vector outlines */
91 #define FT_MODULE_DRIVER_HAS_HINTER 0x400 /* the driver provides its */
92 /* own hinter */
93
94
95 /* deprecated values */
96 #define ft_module_font_driver FT_MODULE_FONT_DRIVER
97 #define ft_module_renderer FT_MODULE_RENDERER
98 #define ft_module_hinter FT_MODULE_HINTER
99 #define ft_module_styler FT_MODULE_STYLER
100
101 #define ft_module_driver_scalable FT_MODULE_DRIVER_SCALABLE
102 #define ft_module_driver_no_outlines FT_MODULE_DRIVER_NO_OUTLINES
103 #define ft_module_driver_has_hinter FT_MODULE_DRIVER_HAS_HINTER
104
105
106 typedef FT_Pointer FT_Module_Interface;
107
108
109 /*************************************************************************/
110 /* */
111 /* <FuncType> */
112 /* FT_Module_Constructor */
113 /* */
114 /* <Description> */
115 /* A function used to initialize (not create) a new module object. */
116 /* */
117 /* <Input> */
118 /* module :: The module to initialize. */
119 /* */
120 typedef FT_Error
121 (*FT_Module_Constructor)( FT_Module module );
122
123
124 /*************************************************************************/
125 /* */
126 /* <FuncType> */
127 /* FT_Module_Destructor */
128 /* */
129 /* <Description> */
130 /* A function used to finalize (not destroy) a given module object. */
131 /* */
132 /* <Input> */
133 /* module :: The module to finalize. */
134 /* */
135 typedef void
136 (*FT_Module_Destructor)( FT_Module module );
137
138
139 /*************************************************************************/
140 /* */
141 /* <FuncType> */
142 /* FT_Module_Requester */
143 /* */
144 /* <Description> */
145 /* A function used to query a given module for a specific interface. */
146 /* */
147 /* <Input> */
148 /* module :: The module to be searched. */
149 /* */
150 /* name :: The name of the interface in the module. */
151 /* */
152 typedef FT_Module_Interface
153 (*FT_Module_Requester)( FT_Module module,
154 const char* name );
155
156
157 /*************************************************************************/
158 /* */
159 /* <Struct> */
160 /* FT_Module_Class */
161 /* */
162 /* <Description> */
163 /* The module class descriptor. */
164 /* */
165 /* <Fields> */
166 /* module_flags :: Bit flags describing the module. */
167 /* */
168 /* module_size :: The size of one module object/instance in */
169 /* bytes. */
170 /* */
171 /* module_name :: The name of the module. */
172 /* */
173 /* module_version :: The version, as a 16.16 fixed number */
174 /* (major.minor). */
175 /* */
176 /* module_requires :: The version of FreeType this module requires, */
177 /* as a 16.16 fixed number (major.minor). Starts */
178 /* at version 2.0, i.e., 0x20000. */
179 /* */
180 /* module_init :: The initializing function. */
181 /* */
182 /* module_done :: The finalizing function. */
183 /* */
184 /* get_interface :: The interface requesting function. */
185 /* */
186 typedef struct FT_Module_Class_
187 {
188 FT_ULong module_flags;
189 FT_Long module_size;
190 const FT_String* module_name;
191 FT_Fixed module_version;
192 FT_Fixed module_requires;
193
194 const void* module_interface;
195
196 FT_Module_Constructor module_init;
197 FT_Module_Destructor module_done;
198 FT_Module_Requester get_interface;
199
200 } FT_Module_Class;
201
202
203 /*************************************************************************/
204 /* */
205 /* <Function> */
206 /* FT_Add_Module */
207 /* */
208 /* <Description> */
209 /* Add a new module to a given library instance. */
210 /* */
211 /* <InOut> */
212 /* library :: A handle to the library object. */
213 /* */
214 /* <Input> */
215 /* clazz :: A pointer to class descriptor for the module. */
216 /* */
217 /* <Return> */
218 /* FreeType error code. 0~means success. */
219 /* */
220 /* <Note> */
221 /* An error will be returned if a module already exists by that name, */
222 /* or if the module requires a version of FreeType that is too great. */
223 /* */
224 FT_EXPORT( FT_Error )
225 FT_Add_Module( FT_Library library,
226 const FT_Module_Class* clazz );
227
228
229 /*************************************************************************/
230 /* */
231 /* <Function> */
232 /* FT_Get_Module */
233 /* */
234 /* <Description> */
235 /* Find a module by its name. */
236 /* */
237 /* <Input> */
238 /* library :: A handle to the library object. */
239 /* */
240 /* module_name :: The module's name (as an ASCII string). */
241 /* */
242 /* <Return> */
243 /* A module handle. 0~if none was found. */
244 /* */
245 /* <Note> */
246 /* FreeType's internal modules aren't documented very well, and you */
247 /* should look up the source code for details. */
248 /* */
249 FT_EXPORT( FT_Module )
250 FT_Get_Module( FT_Library library,
251 const char* module_name );
252
253
254 /*************************************************************************/
255 /* */
256 /* <Function> */
257 /* FT_Remove_Module */
258 /* */
259 /* <Description> */
260 /* Remove a given module from a library instance. */
261 /* */
262 /* <InOut> */
263 /* library :: A handle to a library object. */
264 /* */
265 /* <Input> */
266 /* module :: A handle to a module object. */
267 /* */
268 /* <Return> */
269 /* FreeType error code. 0~means success. */
270 /* */
271 /* <Note> */
272 /* The module object is destroyed by the function in case of success. */
273 /* */
274 FT_EXPORT( FT_Error )
275 FT_Remove_Module( FT_Library library,
276 FT_Module module );
277
278
279 /**********************************************************************
280 *
281 * @function:
282 * FT_Property_Set
283 *
284 * @description:
285 * Set a property for a given module.
286 *
287 * @input:
288 * library ::
289 * A handle to the library the module is part of.
290 *
291 * module_name ::
292 * The module name.
293 *
294 * property_name ::
295 * The property name. Properties are described in the `Synopsis'
296 * subsection of the module's documentation.
297 *
298 * Note that only a few modules have properties.
299 *
300 * value ::
301 * A generic pointer to a variable or structure that gives the new
302 * value of the property. The exact definition of `value' is
303 * dependent on the property; see the `Synopsis' subsection of the
304 * module's documentation.
305 *
306 * @return:
307 * FreeType error code. 0~means success.
308 *
309 * @note:
310 * If `module_name' isn't a valid module name, or `property_name'
311 * doesn't specify a valid property, or if `value' doesn't represent a
312 * valid value for the given property, an error is returned.
313 *
314 * The following example sets property `bar' (a simple integer) in
315 * module `foo' to value~1.
316 *
317 * {
318 * FT_UInt bar;
319 *
320 *
321 * bar = 1;
322 * FT_Property_Set( library, "foo", "bar", &bar );
323 * }
324 *
325 * Note that the FreeType Cache sub-system doesn't recognize module
326 * property changes. To avoid glyph lookup confusion within the cache
327 * you should call @FTC_Manager_Reset to completely flush the cache if
328 * a module property gets changed after @FTC_Manager_New has been
329 * called.
330 *
331 * It is not possible to set properties of the FreeType Cache
332 * sub-system itself with FT_Property_Set; use @FTC_Property_Set
333 * instead.
334 *
335 * @since:
336 * 2.4.11
337 *
338 */
339 FT_EXPORT( FT_Error )
340 FT_Property_Set( FT_Library library,
341 const FT_String* module_name,
342 const FT_String* property_name,
343 const void* value );
344
345
346 /**********************************************************************
347 *
348 * @function:
349 * FT_Property_Get
350 *
351 * @description:
352 * Get a module's property value.
353 *
354 * @input:
355 * library ::
356 * A handle to the library the module is part of.
357 *
358 * module_name ::
359 * The module name.
360 *
361 * property_name ::
362 * The property name. Properties are described in the `Synopsis'
363 * subsection of the module's documentation.
364 *
365 * @inout:
366 * value ::
367 * A generic pointer to a variable or structure that gives the
368 * value of the property. The exact definition of `value' is
369 * dependent on the property; see the `Synopsis' subsection of the
370 * module's documentation.
371 *
372 * @return:
373 * FreeType error code. 0~means success.
374 *
375 * @note:
376 * If `module_name' isn't a valid module name, or `property_name'
377 * doesn't specify a valid property, or if `value' doesn't represent a
378 * valid value for the given property, an error is returned.
379 *
380 * The following example gets property `baz' (a range) in module `foo'.
381 *
382 * {
383 * typedef range_
384 * {
385 * FT_Int32 min;
386 * FT_Int32 max;
387 *
388 * } range;
389 *
390 * range baz;
391 *
392 *
393 * FT_Property_Get( library, "foo", "baz", &baz );
394 * }
395 *
396 * It is not possible to retrieve properties of the FreeType Cache
397 * sub-system with FT_Property_Get; use @FTC_Property_Get instead.
398 *
399 * @since:
400 * 2.4.11
401 *
402 */
403 FT_EXPORT( FT_Error )
404 FT_Property_Get( FT_Library library,
405 const FT_String* module_name,
406 const FT_String* property_name,
407 void* value );
408
409
410 /*************************************************************************/
411 /* */
412 /* <Function> */
413 /* FT_Reference_Library */
414 /* */
415 /* <Description> */
416 /* A counter gets initialized to~1 at the time an @FT_Library */
417 /* structure is created. This function increments the counter. */
418 /* @FT_Done_Library then only destroys a library if the counter is~1, */
419 /* otherwise it simply decrements the counter. */
420 /* */
421 /* This function helps in managing life-cycles of structures that */
422 /* reference @FT_Library objects. */
423 /* */
424 /* <Input> */
425 /* library :: A handle to a target library object. */
426 /* */
427 /* <Return> */
428 /* FreeType error code. 0~means success. */
429 /* */
430 /* <Since> */
431 /* 2.4.2 */
432 /* */
433 FT_EXPORT( FT_Error )
434 FT_Reference_Library( FT_Library library );
435
436
437 /*************************************************************************/
438 /* */
439 /* <Function> */
440 /* FT_New_Library */
441 /* */
442 /* <Description> */
443 /* This function is used to create a new FreeType library instance */
444 /* from a given memory object. It is thus possible to use libraries */
445 /* with distinct memory allocators within the same program. */
446 /* */
447 /* Normally, you would call this function (followed by a call to */
448 /* @FT_Add_Default_Modules or a series of calls to @FT_Add_Module) */
449 /* instead of @FT_Init_FreeType to initialize the FreeType library. */
450 /* */
451 /* Don't use @FT_Done_FreeType but @FT_Done_Library to destroy a */
452 /* library instance. */
453 /* */
454 /* <Input> */
455 /* memory :: A handle to the original memory object. */
456 /* */
457 /* <Output> */
458 /* alibrary :: A pointer to handle of a new library object. */
459 /* */
460 /* <Return> */
461 /* FreeType error code. 0~means success. */
462 /* */
463 /* <Note> */
464 /* See the discussion of reference counters in the description of */
465 /* @FT_Reference_Library. */
466 /* */
467 FT_EXPORT( FT_Error )
468 FT_New_Library( FT_Memory memory,
469 FT_Library *alibrary );
470
471
472 /*************************************************************************/
473 /* */
474 /* <Function> */
475 /* FT_Done_Library */
476 /* */
477 /* <Description> */
478 /* Discard a given library object. This closes all drivers and */
479 /* discards all resource objects. */
480 /* */
481 /* <Input> */
482 /* library :: A handle to the target library. */
483 /* */
484 /* <Return> */
485 /* FreeType error code. 0~means success. */
486 /* */
487 /* <Note> */
488 /* See the discussion of reference counters in the description of */
489 /* @FT_Reference_Library. */
490 /* */
491 FT_EXPORT( FT_Error )
492 FT_Done_Library( FT_Library library );
493
494 /* */
495
496 typedef void
497 (*FT_DebugHook_Func)( void* arg );
498
499
500 /*************************************************************************/
501 /* */
502 /* <Function> */
503 /* FT_Set_Debug_Hook */
504 /* */
505 /* <Description> */
506 /* Set a debug hook function for debugging the interpreter of a font */
507 /* format. */
508 /* */
509 /* <InOut> */
510 /* library :: A handle to the library object. */
511 /* */
512 /* <Input> */
513 /* hook_index :: The index of the debug hook. You should use the */
514 /* values defined in `ftobjs.h', e.g., */
515 /* `FT_DEBUG_HOOK_TRUETYPE'. */
516 /* */
517 /* debug_hook :: The function used to debug the interpreter. */
518 /* */
519 /* <Note> */
520 /* Currently, four debug hook slots are available, but only two (for */
521 /* the TrueType and the Type~1 interpreter) are defined. */
522 /* */
523 /* Since the internal headers of FreeType are no longer installed, */
524 /* the symbol `FT_DEBUG_HOOK_TRUETYPE' isn't available publicly. */
525 /* This is a bug and will be fixed in a forthcoming release. */
526 /* */
527 FT_EXPORT( void )
528 FT_Set_Debug_Hook( FT_Library library,
529 FT_UInt hook_index,
530 FT_DebugHook_Func debug_hook );
531
532
533 /*************************************************************************/
534 /* */
535 /* <Function> */
536 /* FT_Add_Default_Modules */
537 /* */
538 /* <Description> */
539 /* Add the set of default drivers to a given library object. */
540 /* This is only useful when you create a library object with */
541 /* @FT_New_Library (usually to plug a custom memory manager). */
542 /* */
543 /* <InOut> */
544 /* library :: A handle to a new library object. */
545 /* */
546 FT_EXPORT( void )
547 FT_Add_Default_Modules( FT_Library library );
548
549
550
551 /**************************************************************************
552 *
553 * @section:
554 * truetype_engine
555 *
556 * @title:
557 * The TrueType Engine
558 *
559 * @abstract:
560 * TrueType bytecode support.
561 *
562 * @description:
563 * This section contains a function used to query the level of TrueType
564 * bytecode support compiled in this version of the library.
565 *
566 */
567
568
569 /**************************************************************************
570 *
571 * @enum:
572 * FT_TrueTypeEngineType
573 *
574 * @description:
575 * A list of values describing which kind of TrueType bytecode
576 * engine is implemented in a given FT_Library instance. It is used
577 * by the @FT_Get_TrueType_Engine_Type function.
578 *
579 * @values:
580 * FT_TRUETYPE_ENGINE_TYPE_NONE ::
581 * The library doesn't implement any kind of bytecode interpreter.
582 *
583 * FT_TRUETYPE_ENGINE_TYPE_UNPATENTED ::
584 * The library implements a bytecode interpreter that doesn't
585 * support the patented operations of the TrueType virtual machine.
586 *
587 * Its main use is to load certain Asian fonts that position and
588 * scale glyph components with bytecode instructions. It produces
589 * bad output for most other fonts.
590 *
591 * FT_TRUETYPE_ENGINE_TYPE_PATENTED ::
592 * The library implements a bytecode interpreter that covers
593 * the full instruction set of the TrueType virtual machine (this
594 * was governed by patents until May 2010, hence the name).
595 *
596 * @since:
597 * 2.2
598 *
599 */
600 typedef enum FT_TrueTypeEngineType_
601 {
602 FT_TRUETYPE_ENGINE_TYPE_NONE = 0,
603 FT_TRUETYPE_ENGINE_TYPE_UNPATENTED,
604 FT_TRUETYPE_ENGINE_TYPE_PATENTED
605
606 } FT_TrueTypeEngineType;
607
608
609 /**************************************************************************
610 *
611 * @func:
612 * FT_Get_TrueType_Engine_Type
613 *
614 * @description:
615 * Return an @FT_TrueTypeEngineType value to indicate which level of
616 * the TrueType virtual machine a given library instance supports.
617 *
618 * @input:
619 * library ::
620 * A library instance.
621 *
622 * @return:
623 * A value indicating which level is supported.
624 *
625 * @since:
626 * 2.2
627 *
628 */
629 FT_EXPORT( FT_TrueTypeEngineType )
630 FT_Get_TrueType_Engine_Type( FT_Library library );
631
632
633 /* */
634
635
636 FT_END_HEADER
637
638 #endif /* __FTMODAPI_H__ */
639
640
641 /* END */

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