ftserv.h
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上传日期:2020-08-09
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- /***************************************************************************/
- /* */
- /* ftserv.h */
- /* */
- /* The FreeType services (specification only). */
- /* */
- /* Copyright 2003, 2004, 2005, 2006, 2007 by */
- /* David Turner, Robert Wilhelm, and Werner Lemberg. */
- /* */
- /* This file is part of the FreeType project, and may only be used, */
- /* modified, and distributed under the terms of the FreeType project */
- /* license, LICENSE.TXT. By continuing to use, modify, or distribute */
- /* this file you indicate that you have read the license and */
- /* understand and accept it fully. */
- /* */
- /***************************************************************************/
- /*************************************************************************/
- /* */
- /* Each module can export one or more `services'. Each service is */
- /* identified by a constant string and modeled by a pointer; the latter */
- /* generally corresponds to a structure containing function pointers. */
- /* */
- /* Note that a service's data cannot be a mere function pointer because */
- /* in C it is possible that function pointers might be implemented */
- /* differently than data pointers (e.g. 48 bits instead of 32). */
- /* */
- /*************************************************************************/
- #ifndef __FTSERV_H__
- #define __FTSERV_H__
- FT_BEGIN_HEADER
- #if defined( _MSC_VER ) /* Visual C++ (and Intel C++) */
- /* we disable the warning `conditional expression is constant' here */
- /* in order to compile cleanly with the maximum level of warnings */
- #pragma warning( disable : 4127 )
- #endif /* _MSC_VER */
- /*
- * @macro:
- * FT_FACE_FIND_SERVICE
- *
- * @description:
- * This macro is used to look up a service from a face's driver module.
- *
- * @input:
- * face ::
- * The source face handle.
- *
- * id ::
- * A string describing the service as defined in the service's
- * header files (e.g. FT_SERVICE_ID_MULTI_MASTERS which expands to
- * `multi-masters'). It is automatically prefixed with
- * `FT_SERVICE_ID_'.
- *
- * @output:
- * ptr ::
- * A variable that receives the service pointer. Will be NULL
- * if not found.
- */
- #ifdef __cplusplus
- #define FT_FACE_FIND_SERVICE( face, ptr, id )
- FT_BEGIN_STMNT
- FT_Module module = FT_MODULE( FT_FACE( face )->driver );
- FT_Pointer _tmp_ = NULL;
- FT_Pointer* _pptr_ = (FT_Pointer*)&(ptr);
-
-
- if ( module->clazz->get_interface )
- _tmp_ = module->clazz->get_interface( module, FT_SERVICE_ID_ ## id );
- *_pptr_ = _tmp_;
- FT_END_STMNT
- #else /* !C++ */
- #define FT_FACE_FIND_SERVICE( face, ptr, id )
- FT_BEGIN_STMNT
- FT_Module module = FT_MODULE( FT_FACE( face )->driver );
- FT_Pointer _tmp_ = NULL;
-
- if ( module->clazz->get_interface )
- _tmp_ = module->clazz->get_interface( module, FT_SERVICE_ID_ ## id );
- ptr = _tmp_;
- FT_END_STMNT
- #endif /* !C++ */
- /*
- * @macro:
- * FT_FACE_FIND_GLOBAL_SERVICE
- *
- * @description:
- * This macro is used to look up a service from all modules.
- *
- * @input:
- * face ::
- * The source face handle.
- *
- * id ::
- * A string describing the service as defined in the service's
- * header files (e.g. FT_SERVICE_ID_MULTI_MASTERS which expands to
- * `multi-masters'). It is automatically prefixed with
- * `FT_SERVICE_ID_'.
- *
- * @output:
- * ptr ::
- * A variable that receives the service pointer. Will be NULL
- * if not found.
- */
- #ifdef __cplusplus
- #define FT_FACE_FIND_GLOBAL_SERVICE( face, ptr, id )
- FT_BEGIN_STMNT
- FT_Module module = FT_MODULE( FT_FACE( face )->driver );
- FT_Pointer _tmp_;
- FT_Pointer* _pptr_ = (FT_Pointer*)&(ptr);
-
-
- _tmp_ = ft_module_get_service( module, FT_SERVICE_ID_ ## id );
- *_pptr_ = _tmp_;
- FT_END_STMNT
- #else /* !C++ */
- #define FT_FACE_FIND_GLOBAL_SERVICE( face, ptr, id )
- FT_BEGIN_STMNT
- FT_Module module = FT_MODULE( FT_FACE( face )->driver );
- FT_Pointer _tmp_;
-
-
- _tmp_ = ft_module_get_service( module, FT_SERVICE_ID_ ## id );
- ptr = _tmp_;
- FT_END_STMNT
- #endif /* !C++ */
- /*************************************************************************/
- /*************************************************************************/
- /***** *****/
- /***** S E R V I C E D E S C R I P T O R S *****/
- /***** *****/
- /*************************************************************************/
- /*************************************************************************/
- /*
- * The following structure is used to _describe_ a given service
- * to the library. This is useful to build simple static service lists.
- */
- typedef struct FT_ServiceDescRec_
- {
- const char* serv_id; /* service name */
- const void* serv_data; /* service pointer/data */
- } FT_ServiceDescRec;
- typedef const FT_ServiceDescRec* FT_ServiceDesc;
- /*
- * Parse a list of FT_ServiceDescRec descriptors and look for
- * a specific service by ID. Note that the last element in the
- * array must be { NULL, NULL }, and that the function should
- * return NULL if the service isn't available.
- *
- * This function can be used by modules to implement their
- * `get_service' method.
- */
- FT_BASE( FT_Pointer )
- ft_service_list_lookup( FT_ServiceDesc service_descriptors,
- const char* service_id );
- /*************************************************************************/
- /*************************************************************************/
- /***** *****/
- /***** S E R V I C E S C A C H E *****/
- /***** *****/
- /*************************************************************************/
- /*************************************************************************/
- /*
- * This structure is used to store a cache for several frequently used
- * services. It is the type of `face->internal->services'. You
- * should only use FT_FACE_LOOKUP_SERVICE to access it.
- *
- * All fields should have the type FT_Pointer to relax compilation
- * dependencies. We assume the developer isn't completely stupid.
- *
- * Each field must be named `service_XXXX' where `XXX' corresponds to
- * the correct FT_SERVICE_ID_XXXX macro. See the definition of
- * FT_FACE_LOOKUP_SERVICE below how this is implemented.
- *
- */
- typedef struct FT_ServiceCacheRec_
- {
- FT_Pointer service_POSTSCRIPT_FONT_NAME;
- FT_Pointer service_MULTI_MASTERS;
- FT_Pointer service_GLYPH_DICT;
- FT_Pointer service_PFR_METRICS;
- FT_Pointer service_WINFNT;
- } FT_ServiceCacheRec, *FT_ServiceCache;
- /*
- * A magic number used within the services cache.
- */
- #define FT_SERVICE_UNAVAILABLE ((FT_Pointer)-2) /* magic number */
- /*
- * @macro:
- * FT_FACE_LOOKUP_SERVICE
- *
- * @description:
- * This macro is used to lookup a service from a face's driver module
- * using its cache.
- *
- * @input:
- * face::
- * The source face handle containing the cache.
- *
- * field ::
- * The field name in the cache.
- *
- * id ::
- * The service ID.
- *
- * @output:
- * ptr ::
- * A variable receiving the service data. NULL if not available.
- */
- #ifdef __cplusplus
- #define FT_FACE_LOOKUP_SERVICE( face, ptr, id )
- FT_BEGIN_STMNT
- FT_Pointer svc;
- FT_Pointer* Pptr = (FT_Pointer*)&(ptr);
-
-
- svc = FT_FACE( face )->internal->services. service_ ## id;
- if ( svc == FT_SERVICE_UNAVAILABLE )
- svc = NULL;
- else if ( svc == NULL )
- {
- FT_FACE_FIND_SERVICE( face, svc, id );
-
- FT_FACE( face )->internal->services. service_ ## id =
- (FT_Pointer)( svc != NULL ? svc
- : FT_SERVICE_UNAVAILABLE );
- }
- *Pptr = svc;
- FT_END_STMNT
- #else /* !C++ */
- #define FT_FACE_LOOKUP_SERVICE( face, ptr, id )
- FT_BEGIN_STMNT
- FT_Pointer svc;
-
-
- svc = FT_FACE( face )->internal->services. service_ ## id;
- if ( svc == FT_SERVICE_UNAVAILABLE )
- svc = NULL;
- else if ( svc == NULL )
- {
- FT_FACE_FIND_SERVICE( face, svc, id );
-
- FT_FACE( face )->internal->services. service_ ## id =
- (FT_Pointer)( svc != NULL ? svc
- : FT_SERVICE_UNAVAILABLE );
- }
- ptr = svc;
- FT_END_STMNT
- #endif /* !C++ */
- /*
- * A macro used to define new service structure types.
- */
- #define FT_DEFINE_SERVICE( name )
- typedef struct FT_Service_ ## name ## Rec_
- FT_Service_ ## name ## Rec ;
- typedef struct FT_Service_ ## name ## Rec_
- const * FT_Service_ ## name ;
- struct FT_Service_ ## name ## Rec_
- /* */
- /*
- * The header files containing the services.
- */
- #define FT_SERVICE_BDF_H <freetype/internal/services/svbdf.h>
- #define FT_SERVICE_GLYPH_DICT_H <freetype/internal/services/svgldict.h>
- #define FT_SERVICE_GX_VALIDATE_H <freetype/internal/services/svgxval.h>
- #define FT_SERVICE_KERNING_H <freetype/internal/services/svkern.h>
- #define FT_SERVICE_MULTIPLE_MASTERS_H <freetype/internal/services/svmm.h>
- #define FT_SERVICE_OPENTYPE_VALIDATE_H <freetype/internal/services/svotval.h>
- #define FT_SERVICE_PFR_H <freetype/internal/services/svpfr.h>
- #define FT_SERVICE_POSTSCRIPT_CMAPS_H <freetype/internal/services/svpscmap.h>
- #define FT_SERVICE_POSTSCRIPT_INFO_H <freetype/internal/services/svpsinfo.h>
- #define FT_SERVICE_POSTSCRIPT_NAME_H <freetype/internal/services/svpostnm.h>
- #define FT_SERVICE_SFNT_H <freetype/internal/services/svsfnt.h>
- #define FT_SERVICE_TRUETYPE_ENGINE_H <freetype/internal/services/svtteng.h>
- #define FT_SERVICE_TT_CMAP_H <freetype/internal/services/svttcmap.h>
- #define FT_SERVICE_WINFNT_H <freetype/internal/services/svwinfnt.h>
- #define FT_SERVICE_XFREE86_NAME_H <freetype/internal/services/svxf86nm.h>
- #define FT_SERVICE_TRUETYPE_GLYF_H <freetype/internal/services/svttglyf.h>
- /* */
- FT_END_HEADER
- #endif /* __FTSERV_H__ */
- /* END */