+++ /dev/null
-/***************************************************************************/
-/* */
-/* ftextend.h */
-/* */
-/* FreeType extensions implementation (specification). */
-/* */
-/* Copyright 1996-2001 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. */
-/* */
-/***************************************************************************/
-
-
-#ifndef __FTEXTEND_H__
-#define __FTEXTEND_H__
-
-
-#include <ft2build.h>
-#include FT_INTERNAL_OBJECTS_H
-
-
-FT_BEGIN_HEADER
-
-
- /*************************************************************************/
- /* */
- /* The extensions don't need to be integrated at compile time into the */
- /* engine, only at link time. */
- /* */
- /*************************************************************************/
-
-
- /*************************************************************************/
- /* */
- /* <FuncType> */
- /* FT_Extension_Initializer */
- /* */
- /* <Description> */
- /* Each new face object can have several extensions associated with */
- /* it at creation time. This function is used to initialize given */
- /* extension data for a given face. */
- /* */
- /* <InOut> */
- /* ext :: A typeless pointer to the extension data. */
- /* */
- /* face :: A handle to the source face object the extension is */
- /* associated with. */
- /* */
- /* <Return> */
- /* FreeType error code. 0 means success. */
- /* */
- /* <Note> */
- /* In case of error, the initializer should not destroy the extension */
- /* data, as the finalizer will get called later by the function's */
- /* caller. */
- /* */
- typedef FT_Error
- (*FT_Extension_Initializer)( void* ext,
- FT_Face face );
-
-
- /*************************************************************************/
- /* */
- /* <FuncType> */
- /* FT_Extension_Finalizer */
- /* */
- /* <Description> */
- /* Each new face object can have several extensions associated with */
- /* it at creation time. This function is used to finalize given */
- /* extension data for a given face; it occurs before the face object */
- /* itself is finalized. */
- /* */
- /* <InOut> */
- /* ext :: A typeless pointer to the extension data. */
- /* */
- /* face :: A handle to the source face object the extension is */
- /* associated with. */
- /* */
- typedef void
- (*FT_Extension_Finalizer)( void* ext,
- FT_Face face );
-
-
- /*************************************************************************/
- /* */
- /* <Struct> */
- /* FT_Extension_Class */
- /* */
- /* <Description> */
- /* A simple structure used to describe a given extension to the */
- /* FreeType base layer. An FT_Extension_Class is used as a parameter */
- /* for FT_Register_Extension(). */
- /* */
- /* <Fields> */
- /* id :: The extension's ID. This is a normal C string that */
- /* is used to uniquely reference the extension's */
- /* interface. */
- /* */
- /* size :: The size in bytes of the extension data that must be */
- /* associated with each face object. */
- /* */
- /* init :: A pointer to the extension data's initializer. */
- /* */
- /* finalize :: A pointer to the extension data's finalizer. */
- /* */
- /* interface :: This pointer can be anything, but should usually */
- /* point to a table of function pointers which implement */
- /* the extension's interface. */
- /* */
- /* offset :: This field is set and used within the base layer and */
- /* should be set to 0 when registering an extension */
- /* through FT_Register_Extension(). It contains an */
- /* offset within the face's extension block for the */
- /* current extension's data. */
- /* */
- typedef struct FT_Extension_Class_
- {
- const char* id;
- FT_ULong size;
- FT_Extension_Initializer init;
- FT_Extension_Finalizer finalize;
- void* interface;
-
- FT_ULong offset;
-
- } FT_Extension_Class;
-
-
- /*************************************************************************/
- /* */
- /* <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. */
- /* */
- FT_EXPORT( FT_Error )
- FT_Register_Extension( FT_Driver driver,
- FT_Extension_Class* clazz );
-
-
-#ifdef FT_CONFIG_OPTION_EXTEND_ENGINE
-
-
- /* Initialize the extension component */
- FT_LOCAL FT_Error
- FT_Init_Extensions( FT_Library library );
-
- /* Finalize the extension component */
- FT_LOCAL FT_Error
- FT_Done_Extensions( FT_Library library );
-
- /* Create an extension within a face object. Called by the */
- /* face object constructor. */
- FT_LOCAL FT_Error
- FT_Create_Extensions( FT_Face face );
-
- /* Destroy all extensions within a face object. Called by the */
- /* face object destructor. */
- FT_LOCAL FT_Error
- FT_Destroy_Extensions( FT_Face face );
-
-
-#endif
-
-
- /*************************************************************************/
- /* */
- /* <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 generic pointer to the extension block. */
- /* */
- FT_EXPORT( void* )
- FT_Get_Extension( FT_Face face,
- const char* extension_id,
- void** extension_interface );
-
-
-FT_END_HEADER
-
-#endif /* __FTEXTEND_H__ */
-
-
-/* END */
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