/***************************************************************************/ /* */ /* 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; /*************************************************************************/ /* */ /* */ /* FT_DEFINE_SERVICEDESCREC1 .. FT_DEFINE_SERVICEDESCREC6 */ /* */ /* */ /* Used to initialize an array of FT_ServiceDescRec structs. */ /* */ /* When FT_CONFIG_OPTION_PIC is defined a Create funtion will need */ /* to called with a pointer where the allocated array is returned. */ /* And when it is no longer needed a Destroy function needs */ /* to be called to release that allocation. */ /* */ /* These functions should be manyally 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} \ }; #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; \ 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; \ 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; \ 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; \ 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; \ 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; \ 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; \ } #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. */ #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 #define FT_SERVICE_CID_H #define FT_SERVICE_GLYPH_DICT_H #define FT_SERVICE_GX_VALIDATE_H #define FT_SERVICE_KERNING_H #define FT_SERVICE_MULTIPLE_MASTERS_H #define FT_SERVICE_OPENTYPE_VALIDATE_H #define FT_SERVICE_PFR_H #define FT_SERVICE_POSTSCRIPT_CMAPS_H #define FT_SERVICE_POSTSCRIPT_INFO_H #define FT_SERVICE_POSTSCRIPT_NAME_H #define FT_SERVICE_SFNT_H #define FT_SERVICE_TRUETYPE_ENGINE_H #define FT_SERVICE_TT_CMAP_H #define FT_SERVICE_WINFNT_H #define FT_SERVICE_XFREE86_NAME_H #define FT_SERVICE_TRUETYPE_GLYF_H /* */ FT_END_HEADER #endif /* __FTSERV_H__ */ /* END */