kc3-lang/freetype/src/base/ftextend.c
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Hash : 7f7aadf4
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Date : 2000-03-13T12:57:27
finished moving all configuration macros to "config/ftoption.h"
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src/base/ftextend.c
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/***************************************************************************/ /* */ /* ftextend.h */ /* */ /* FreeType extensions implementation (body). */ /* */ /* Copyright 1996-2000 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. */ /* */ /***************************************************************************/ /*************************************************************************/ /* */ /* This is an updated version of the extension component, now located */ /* in the main library's source directory. It allows the dynamic */ /* registration/use of various face object extensions through a simple */ /* API. */ /* */ /*************************************************************************/ #include <ftextend.h> /* required by the tracing mode */ #undef FT_COMPONENT #define FT_COMPONENT trace_extend typedef struct FT_Extension_Registry_ { FT_Int num_extensions; FT_Long cur_offset; FT_Extension_Class classes[FT_MAX_EXTENSIONS]; } FT_Extension_Registry; /*************************************************************************/ /* */ /* <Function> */ /* FT_Init_Extensions */ /* */ /* <Description> */ /* Initializes the extension component. */ /* */ /* <InOut> */ /* driver :: A handle to the driver object. */ /* */ /* <Return> */ /* FreeType error code. 0 means success. */ /* */ LOCAL_FUNC FT_Error FT_Init_Extensions( FT_Driver driver ) { FT_Error error; FT_Memory memory; FT_Extension_Registry* registry; memory = driver->library->memory; if ( ALLOC( registry, sizeof ( *registry ) ) ) return error; registry->num_extensions = 0; registry->cur_offset = 0; driver->extensions = registry; return FT_Err_Ok; } /*************************************************************************/ /* */ /* <Function> */ /* FT_Done_Extensions */ /* */ /* <Description> */ /* Finalizes the extension component. */ /* */ /* <InOut> */ /* driver :: A handle to the driver object. */ /* */ /* <Return> */ /* FreeType error code. 0 means success. */ /* */ LOCAL_FUNC FT_Error FT_Done_Extensions( FT_Driver driver ) { FT_Memory memory = driver->memory; FREE( driver->extensions ); return FT_Err_Ok; } /*************************************************************************/ /* */ /* <Function> */ /* FT_Register_Extension */ /* */ /* <Description> */ /* Registers a new extension. */ /* */ /* <InOut> */ /* driver :: A handle to the driver object. */ /* class :: A pointer to a class describing the extension. */ /* */ /* <Return> */ /* FreeType error code. 0 means success. */ /* */ EXPORT_FUNC FT_Error FT_Register_Extension( FT_Driver driver, FT_Extension_Class* class ) { FT_Extension_Registry* registry; registry = (FT_Extension_Registry*)driver->extensions; if ( registry ) { FT_Int n = registry->num_extensions; FT_Extension_Class* cur = registry->classes + n; if ( n >= FT_MAX_EXTENSIONS ) return FT_Err_Too_Many_Extensions; *cur = *class; cur->offset = registry->cur_offset; registry->num_extensions++; registry->cur_offset += ( cur->size + FT_ALIGNMENT-1 ) & -FT_ALIGNMENT; } return FT_Err_Ok; } /*************************************************************************/ /* */ /* <Function> */ /* FT_Get_Extension */ /* */ /* <Description> */ /* Queries an extension block by an extension ID string. */ /* */ /* <Input> */ /* face :: A handle to the face object. */ /* extension_id :: An ID string identifying the extension. */ /* */ /* <Output> */ /* extension_interface :: A generic pointer, usually pointing to a */ /* table of functions implementing the */ /* extension interface. */ /* */ /* <Return> */ /* A pointer to the extension block. */ /* */ EXPORT_FUNC void* FT_Get_Extension( FT_Face face, const char* extension_id, void* *extension_interface ) { FT_Extension_Registry* registry; registry = (FT_Extension_Registry*)face->driver->extensions; if ( registry && face->extensions ) { FT_Extension_Class* cur = registry->classes; FT_Extension_Class* limit = cur + registry->num_extensions; for ( ; cur < limit; cur++ ) if ( strcmp( cur->id, extension_id ) == 0 ) { *extension_interface = cur->interface; return (void*)((char*)face->extensions + cur->offset); } } /* could not find the extension id */ *extension_interface = 0; return 0; } /*************************************************************************/ /* */ /* <Function> */ /* FT_Destroy_Extensions */ /* */ /* <Description> */ /* Destroys all extensions within a face object. */ /* */ /* <InOut> */ /* face :: A handle to the face object. */ /* */ /* <Return> */ /* FreeType error code. 0 means success. */ /* */ /* <Note> */ /* Called by the face object destructor. */ /* */ LOCAL_FUNC FT_Error FT_Destroy_Extensions( FT_Face face ) { FT_Extension_Registry* registry; FT_Memory memory; registry = (FT_Extension_Registry*)face->driver->extensions; if ( registry && face->extensions ) { FT_Extension_Class* cur = registry->classes; FT_Extension_Class* limit = cur + registry->num_extensions; for ( ; cur < limit; cur++ ) { char* ext = (char*)face->extensions + cur->offset; if ( cur->finalize ) cur->finalize( ext, face ); } memory = face->driver->memory; FREE( face->extensions ); } return FT_Err_Ok; } /*************************************************************************/ /* */ /* <Function> */ /* FT_Create_Extensions */ /* */ /* <Description> */ /* Creates an extension object within a face object for all */ /* registered extensions. */ /* */ /* <InOut> */ /* face :: A handle to the face object. */ /* */ /* <Return> */ /* FreeType error code. 0 means success. */ /* */ /* <Note> */ /* Called by the face object constructor. */ /* */ LOCAL_FUNC FT_Error FT_Create_Extensions( FT_Face face ) { FT_Extension_Registry* registry; FT_Memory memory; FT_Error error; face->extensions = 0; /* load extensions registry, exit successfully if none is there */ registry = (FT_Extension_Registry*)face->driver->extensions; if ( !registry ) return FT_Err_Ok; memory = face->driver->memory; if ( ALLOC( face->extensions, registry->cur_offset ) ) return error; { FT_Extension_Class* cur = registry->classes; FT_Extension_Class* limit = cur + registry->num_extensions; for ( ; cur < limit; cur++ ) { char* ext = (char*)face->extensions + cur->offset; if ( cur->init ) { error = cur->init( ext, face ); if ( error ) break; } } } return error; } /* END */