ref: 8f17809b2d1051a50f743b3e38a54add98eebc30
dir: /include/internal/ftserv.h/
/***************************************************************************/ /* */ /* ftserv.h */ /* */ /* The FreeType services (specification only). */ /* */ /* Copyright 2003-2007, 2009, 2012, 2013 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 /* * @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; /*************************************************************************/ /* */ /* <Macro> */ /* FT_DEFINE_SERVICEDESCREC1 */ /* FT_DEFINE_SERVICEDESCREC2 */ /* FT_DEFINE_SERVICEDESCREC3 */ /* FT_DEFINE_SERVICEDESCREC4 */ /* FT_DEFINE_SERVICEDESCREC5 */ /* FT_DEFINE_SERVICEDESCREC6 */ /* FT_DEFINE_SERVICEDESCREC7 */ /* */ /* <Description> */ /* Used to initialize an array of FT_ServiceDescRec structures. */ /* */ /* When FT_CONFIG_OPTION_PIC is defined a `create' function needs to */ /* be called with a pointer to return an allocated array. As soon as */ /* it is no longer needed, a `destroy' function needs to be called to */ /* release that allocation. */ /* */ /* These functions should be manually called from the `pic_init' and */ /* `pic_free' functions of your module (see FT_DEFINE_MODULE). */ /* */ /* When FT_CONFIG_OPTION_PIC is not defined the array will be */ /* allocated in the global scope (or the scope where the macro is */ /* used). */ /* */ #ifndef FT_CONFIG_OPTION_PIC #define FT_DEFINE_SERVICEDESCREC1( class_, \ serv_id_1, serv_data_1 ) \ static const FT_ServiceDescRec class_[] = \ { \ { serv_id_1, serv_data_1 }, \ { NULL, NULL } \ }; #define FT_DEFINE_SERVICEDESCREC2( class_, \ serv_id_1, serv_data_1, \ serv_id_2, serv_data_2 ) \ static const FT_ServiceDescRec class_[] = \ { \ { serv_id_1, serv_data_1 }, \ { serv_id_2, serv_data_2 }, \ { NULL, NULL } \ }; #define FT_DEFINE_SERVICEDESCREC3( class_, \ serv_id_1, serv_data_1, \ serv_id_2, serv_data_2, \ serv_id_3, serv_data_3 ) \ static const FT_ServiceDescRec class_[] = \ { \ { serv_id_1, serv_data_1 }, \ { serv_id_2, serv_data_2 }, \ { serv_id_3, serv_data_3 }, \ { NULL, NULL } \ }; #define FT_DEFINE_SERVICEDESCREC4( class_, \ serv_id_1, serv_data_1, \ serv_id_2, serv_data_2, \ serv_id_3, serv_data_3, \ serv_id_4, serv_data_4 ) \ static const FT_ServiceDescRec class_[] = \ { \ { serv_id_1, serv_data_1 }, \ { serv_id_2, serv_data_2 }, \ { serv_id_3, serv_data_3 }, \ { serv_id_4, serv_data_4 }, \ { NULL, NULL } \ }; #define FT_DEFINE_SERVICEDESCREC5( class_, \ serv_id_1, serv_data_1, \ serv_id_2, serv_data_2, \ serv_id_3, serv_data_3, \ serv_id_4, serv_data_4, \ serv_id_5, serv_data_5 ) \ static const FT_ServiceDescRec class_[] = \ { \ { serv_id_1, serv_data_1 }, \ { serv_id_2, serv_data_2 }, \ { serv_id_3, serv_data_3 }, \ { serv_id_4, serv_data_4 }, \ { serv_id_5, serv_data_5 }, \ { NULL, NULL } \ }; #define FT_DEFINE_SERVICEDESCREC6( class_, \ serv_id_1, serv_data_1, \ serv_id_2, serv_data_2, \ serv_id_3, serv_data_3, \ serv_id_4, serv_data_4, \ serv_id_5, serv_data_5, \ serv_id_6, serv_data_6 ) \ static const FT_ServiceDescRec class_[] = \ { \ { serv_id_1, serv_data_1 }, \ { serv_id_2, serv_data_2 }, \ { serv_id_3, serv_data_3 }, \ { serv_id_4, serv_data_4 }, \ { serv_id_5, serv_data_5 }, \ { serv_id_6, serv_data_6 }, \ { NULL, NULL } \ }; #define FT_DEFINE_SERVICEDESCREC7( class_, \ serv_id_1, serv_data_1, \ serv_id_2, serv_data_2, \ serv_id_3, serv_data_3, \ serv_id_4, serv_data_4, \ serv_id_5, serv_data_5, \ serv_id_6, serv_data_6, \ serv_id_7, serv_data_7 ) \ static const FT_ServiceDescRec class_[] = \ { \ { serv_id_1, serv_data_1 }, \ { serv_id_2, serv_data_2 }, \ { serv_id_3, serv_data_3 }, \ { serv_id_4, serv_data_4 }, \ { serv_id_5, serv_data_5 }, \ { serv_id_6, serv_data_6 }, \ { serv_id_7, serv_data_7 }, \ { NULL, NULL } \ }; #else /* FT_CONFIG_OPTION_PIC */ #define FT_DEFINE_SERVICEDESCREC1( class_, \ serv_id_1, serv_data_1 ) \ void \ FT_Destroy_Class_ ## class_( FT_Library library, \ FT_ServiceDescRec* clazz ) \ { \ FT_Memory memory = library->memory; \ \ \ if ( clazz ) \ FT_FREE( clazz ); \ } \ \ FT_Error \ FT_Create_Class_ ## class_( FT_Library library, \ FT_ServiceDescRec** output_class ) \ { \ FT_ServiceDescRec* clazz = NULL; \ FT_Error error; \ FT_Memory memory = library->memory; \ \ \ if ( FT_ALLOC( clazz, sizeof ( *clazz ) * 2 ) ) \ return error; \ \ clazz[0].serv_id = serv_id_1; \ clazz[0].serv_data = serv_data_1; \ clazz[1].serv_id = NULL; \ clazz[1].serv_data = NULL; \ \ *output_class = clazz; \ \ return FT_Err_Ok; \ } #define FT_DEFINE_SERVICEDESCREC2( class_, \ serv_id_1, serv_data_1, \ serv_id_2, serv_data_2 ) \ void \ FT_Destroy_Class_ ## class_( FT_Library library, \ FT_ServiceDescRec* clazz ) \ { \ FT_Memory memory = library->memory; \ \ \ if ( clazz ) \ FT_FREE( clazz ); \ } \ \ FT_Error \ FT_Create_Class_ ## class_( FT_Library library, \ FT_ServiceDescRec** output_class ) \ { \ FT_ServiceDescRec* clazz = NULL; \ FT_Error error; \ FT_Memory memory = library->memory; \ \ \ if ( FT_ALLOC( clazz, sizeof ( *clazz ) * 3 ) ) \ return error; \ \ clazz[0].serv_id = serv_id_1; \ clazz[0].serv_data = serv_data_1; \ clazz[1].serv_id = serv_id_2; \ clazz[1].serv_data = serv_data_2; \ clazz[2].serv_id = NULL; \ clazz[2].serv_data = NULL; \ \ *output_class = clazz; \ \ return FT_Err_Ok; \ } #define FT_DEFINE_SERVICEDESCREC3( class_, \ serv_id_1, serv_data_1, \ serv_id_2, serv_data_2, \ serv_id_3, serv_data_3 ) \ void \ FT_Destroy_Class_ ## class_( FT_Library library, \ FT_ServiceDescRec* clazz ) \ { \ FT_Memory memory = library->memory; \ \ \ if ( clazz ) \ FT_FREE( clazz ); \ } \ \ FT_Error \ FT_Create_Class_ ## class_( FT_Library library, \ FT_ServiceDescRec** output_class ) \ { \ FT_ServiceDescRec* clazz = NULL; \ FT_Error error; \ FT_Memory memory = library->memory; \ \ \ if ( FT_ALLOC( clazz, sizeof ( *clazz ) * 4 ) ) \ return error; \ \ clazz[0].serv_id = serv_id_1; \ clazz[0].serv_data = serv_data_1; \ clazz[1].serv_id = serv_id_2; \ clazz[1].serv_data = serv_data_2; \ clazz[2].serv_id = serv_id_3; \ clazz[2].serv_data = serv_data_3; \ clazz[3].serv_id = NULL; \ clazz[3].serv_data = NULL; \ \ *output_class = clazz; \ \ return FT_Err_Ok; \ } #define FT_DEFINE_SERVICEDESCREC4( class_, \ serv_id_1, serv_data_1, \ serv_id_2, serv_data_2, \ serv_id_3, serv_data_3, \ serv_id_4, serv_data_4 ) \ void \ FT_Destroy_Class_ ## class_( FT_Library library, \ FT_ServiceDescRec* clazz ) \ { \ FT_Memory memory = library->memory; \ \ \ if ( clazz ) \ FT_FREE( clazz ); \ } \ \ FT_Error \ FT_Create_Class_ ## class_( FT_Library library, \ FT_ServiceDescRec** output_class ) \ { \ FT_ServiceDescRec* clazz = NULL; \ FT_Error error; \ FT_Memory memory = library->memory; \ \ \ if ( FT_ALLOC( clazz, sizeof ( *clazz ) * 5 ) ) \ return error; \ \ clazz[0].serv_id = serv_id_1; \ clazz[0].serv_data = serv_data_1; \ clazz[1].serv_id = serv_id_2; \ clazz[1].serv_data = serv_data_2; \ clazz[2].serv_id = serv_id_3; \ clazz[2].serv_data = serv_data_3; \ clazz[3].serv_id = serv_id_4; \ clazz[3].serv_data = serv_data_4; \ clazz[4].serv_id = NULL; \ clazz[4].serv_data = NULL; \ \ *output_class = clazz; \ \ return FT_Err_Ok; \ } #define FT_DEFINE_SERVICEDESCREC5( class_, \ serv_id_1, serv_data_1, \ serv_id_2, serv_data_2, \ serv_id_3, serv_data_3, \ serv_id_4, serv_data_4, \ serv_id_5, serv_data_5 ) \ void \ FT_Destroy_Class_ ## class_( FT_Library library, \ FT_ServiceDescRec* clazz ) \ { \ FT_Memory memory = library->memory; \ \ \ if ( clazz ) \ FT_FREE( clazz ); \ } \ \ FT_Error \ FT_Create_Class_ ## class_( FT_Library library, \ FT_ServiceDescRec** output_class ) \ { \ FT_ServiceDescRec* clazz = NULL; \ FT_Error error; \ FT_Memory memory = library->memory; \ \ \ if ( FT_ALLOC( clazz, sizeof ( *clazz ) * 6 ) ) \ return error; \ \ clazz[0].serv_id = serv_id_1; \ clazz[0].serv_data = serv_data_1; \ clazz[1].serv_id = serv_id_2; \ clazz[1].serv_data = serv_data_2; \ clazz[2].serv_id = serv_id_3; \ clazz[2].serv_data = serv_data_3; \ clazz[3].serv_id = serv_id_4; \ clazz[3].serv_data = serv_data_4; \ clazz[4].serv_id = serv_id_5; \ clazz[4].serv_data = serv_data_5; \ clazz[5].serv_id = NULL; \ clazz[5].serv_data = NULL; \ \ *output_class = clazz; \ \ return FT_Err_Ok; \ } #define FT_DEFINE_SERVICEDESCREC6( class_, \ serv_id_1, serv_data_1, \ serv_id_2, serv_data_2, \ serv_id_3, serv_data_3, \ serv_id_4, serv_data_4, \ serv_id_5, serv_data_5, \ serv_id_6, serv_data_6 ) \ void \ FT_Destroy_Class_ ## class_( FT_Library library, \ FT_ServiceDescRec* clazz ) \ { \ FT_Memory memory = library->memory; \ \ \ if ( clazz ) \ FT_FREE( clazz ); \ } \ \ FT_Error \ FT_Create_Class_ ## class_( FT_Library library, \ FT_ServiceDescRec** output_class) \ { \ FT_ServiceDescRec* clazz = NULL; \ FT_Error error; \ FT_Memory memory = library->memory; \ \ \ if ( FT_ALLOC( clazz, sizeof ( *clazz ) * 7 ) ) \ return error; \ \ clazz[0].serv_id = serv_id_1; \ clazz[0].serv_data = serv_data_1; \ clazz[1].serv_id = serv_id_2; \ clazz[1].serv_data = serv_data_2; \ clazz[2].serv_id = serv_id_3; \ clazz[2].serv_data = serv_data_3; \ clazz[3].serv_id = serv_id_4; \ clazz[3].serv_data = serv_data_4; \ clazz[4].serv_id = serv_id_5; \ clazz[4].serv_data = serv_data_5; \ clazz[5].serv_id = serv_id_6; \ clazz[5].serv_data = serv_data_6; \ clazz[6].serv_id = NULL; \ clazz[6].serv_data = NULL; \ \ *output_class = clazz; \ \ return FT_Err_Ok; \ } #define FT_DEFINE_SERVICEDESCREC7( class_, \ serv_id_1, serv_data_1, \ serv_id_2, serv_data_2, \ serv_id_3, serv_data_3, \ serv_id_4, serv_data_4, \ serv_id_5, serv_data_5, \ serv_id_6, serv_data_6, \ serv_id_7, serv_data_7 ) \ void \ FT_Destroy_Class_ ## class_( FT_Library library, \ FT_ServiceDescRec* clazz ) \ { \ FT_Memory memory = library->memory; \ \ \ if ( clazz ) \ FT_FREE( clazz ); \ } \ \ FT_Error \ FT_Create_Class_ ## class_( FT_Library library, \ FT_ServiceDescRec** output_class) \ { \ FT_ServiceDescRec* clazz = NULL; \ FT_Error error; \ FT_Memory memory = library->memory; \ \ \ if ( FT_ALLOC( clazz, sizeof ( *clazz ) * 8 ) ) \ return error; \ \ clazz[0].serv_id = serv_id_1; \ clazz[0].serv_data = serv_data_1; \ clazz[1].serv_id = serv_id_2; \ clazz[1].serv_data = serv_data_2; \ clazz[2].serv_id = serv_id_3; \ clazz[2].serv_data = serv_data_3; \ clazz[3].serv_id = serv_id_4; \ clazz[3].serv_data = serv_data_4; \ clazz[4].serv_id = serv_id_5; \ clazz[4].serv_data = serv_data_5; \ clazz[5].serv_id = serv_id_6; \ clazz[5].serv_data = serv_data_6; \ clazz[6].serv_id = serv_id_7; \ clazz[6].serv_data = serv_data_7; \ clazz[7].serv_id = NULL; \ clazz[7].serv_data = NULL; \ \ *output_class = clazz; \ \ return FT_Err_Ok; \ } #endif /* FT_CONFIG_OPTION_PIC */ /* * 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. */ /* ensure that value `1' has the same width as a pointer */ #define FT_SERVICE_UNAVAILABLE ((FT_Pointer)~(FT_PtrDist)1) /* * @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 <internal/services/svbdf.h> #define FT_SERVICE_CID_H <internal/services/svcid.h> #define FT_SERVICE_GLYPH_DICT_H <internal/services/svgldict.h> #define FT_SERVICE_GX_VALIDATE_H <internal/services/svgxval.h> #define FT_SERVICE_KERNING_H <internal/services/svkern.h> #define FT_SERVICE_MULTIPLE_MASTERS_H <internal/services/svmm.h> #define FT_SERVICE_OPENTYPE_VALIDATE_H <internal/services/svotval.h> #define FT_SERVICE_PFR_H <internal/services/svpfr.h> #define FT_SERVICE_POSTSCRIPT_CMAPS_H <internal/services/svpscmap.h> #define FT_SERVICE_POSTSCRIPT_INFO_H <internal/services/svpsinfo.h> #define FT_SERVICE_POSTSCRIPT_NAME_H <internal/services/svpostnm.h> #define FT_SERVICE_PROPERTIES_H <internal/services/svprop.h> #define FT_SERVICE_SFNT_H <internal/services/svsfnt.h> #define FT_SERVICE_TRUETYPE_ENGINE_H <internal/services/svtteng.h> #define FT_SERVICE_TT_CMAP_H <internal/services/svttcmap.h> #define FT_SERVICE_WINFNT_H <internal/services/svwinfnt.h> #define FT_SERVICE_XFREE86_NAME_H <internal/services/svxf86nm.h> #define FT_SERVICE_TRUETYPE_GLYF_H <internal/services/svttglyf.h> /* */ FT_END_HEADER #endif /* __FTSERV_H__ */ /* END */