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freetype2/include/freetype/ftmodule.h

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/***************************************************************************/
/* */
/* ftmodule.h */
/* */
/* FreeType modules public interface. */
/* */
/* 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. */
/* */
/***************************************************************************/
#ifndef FTMODULE_H
#define FTMODULE_H
#include <freetype/freetype.h>
/* module bit flags */
typedef enum FT_Module_Flags_
{
ft_module_font_driver = 1, /* this module is a font driver */
ft_module_renderer = 2, /* this module is a renderer */
ft_module_hinter = 4, /* this module is a glyph hinter */
ft_module_styler = 8, /* this module is a styler */
ft_module_driver_scalable = 0x100, /* the driver supports scalable fonts */
ft_module_driver_no_outlines = 0x200, /* the driver does not support vector outlines */
ft_module_driver_has_hinter = 0x400 /* the driver provides its own hinter */
} FT_Module_Flags;
typedef void (*FT_Module_Interface)( void );
typedef FT_Error (*FT_Module_Constructor)( FT_Module module );
typedef void (*FT_Module_Destructor)( FT_Module module );
typedef FT_Module_Interface (*FT_Module_Requester)( FT_Module module,
const char* name );
/*************************************************************************
*
* <Struct>
* FT_Module_Class
*
* <Description>
* The module class descriptor.
*
* <Fields>
* module_flags :: bit flags describing the module
* module_size :: size of one module object/instance in bytes
* module_name :: name of the module
* module_version :: version, as a 16.16 fixed number (major.minor)
* module_requires :: the version of FreeType this module requires
* (starts at 2.0, a.k.a. 0x20000)
*
* module_init :: a function used to initialise (not create) a
* new module object
*
* module_done :: a function used to finalise (not destroy) a
* given module object
*
* get_interface :: queries a given module for a specific interface
* by name..
*
*************************************************************************/
typedef struct FT_Module_Class_
{
FT_ULong module_flags;
FT_Int module_size;
const FT_String* module_name;
FT_Fixed module_version;
FT_Fixed module_requires;
const void* module_interface;
FT_Module_Constructor module_init;
FT_Module_Destructor module_done;
FT_Module_Requester get_interface;
} FT_Module_Class;
/*************************************************************************
*
* <Function>
* FT_Add_Module
*
* <Description>
* Add a new module to a given library instance.
*
* <Input>
* library :: handle to library object
* clazz :: pointer to class descriptor for the module
*
* <Return>
* Error code. 0 means success
*
* <Note>
* An error will be returned if a module already exists by that
* name, or if the module requires a version of freetype that is
* too great
*
*************************************************************************/
FT_EXPORT_DEF(FT_Error) FT_Add_Module( FT_Library library,
const FT_Module_Class* clazz );
/*************************************************************************
*
* <Function>
* FT_Get_Module
*
* <Description>
* Find a module by its name.
*
* <Input>
* library :: handle to library object
* module_name :: the module's ASCII name.
*
* <Return>
* Module handle, 0 if none was found.
*
* <Note>
* You'd better be familiar with FreeType internals to know which
* module to look for :-)
*
*************************************************************************/
FT_EXPORT_DEF(FT_Module) FT_Get_Module( FT_Library library,
const char* module_name );
/*************************************************************************
*
* <Function>
* FT_Get_Module_Interface
*
* <Description>
* Find a module and returns it's specific interface as a void*
*
* <Input>
* library :: handle to library object
* module_name :: the module's ASCII name.
*
* <Return>
* Module specific interface, if any
*
* <Note>
* You'd better be familiar with FreeType internals to know which
* module to look for, and what it's interface is :-)
*
*************************************************************************/
FT_EXPORT_DEF(const void*) FT_Get_Module_Interface( FT_Library library,
const char* mod_name );
/*************************************************************************
*
* <Function>
* FT_Remove_Module
*
* <Description>
* Removes a given module from a library instance.
*
* <Input>
* library :: handle to library object
* module :: handle to module object
*
* <Return>
* Error code (module not listed)
*
* <Note>
* The module object is destroyed by the function in case of success
*
*************************************************************************/
FT_EXPORT_DEF(FT_Error) FT_Remove_Module( FT_Library library,
FT_Module module );
/*************************************************************************
*
* <Function>
* FT_New_Library
*
* <Description>
* Creates a new "virgin" library that uses a custom memory manager.
* The library has no registered driver, those can be added with a
* call to FT_Add_Default_Modules
*
* <Input>
* memory :: handle to custom memory manager
*
* <Output>
* library :: handle to fresh new library object
*
* <Return>
* Error code (module not listed)
*
*************************************************************************/
FT_EXPORT_DEF(FT_Error) FT_New_Library( FT_Memory memory,
FT_Library* library );
/*************************************************************************
*
* <Function>
* FT_Done_Library
*
* <Description>
* Destroys a given library, and all child objects, except the
* memory manager.
*
* <Input>
* library :: handle to target library object
*
* <Return>
* Error code (module not listed)
*
*************************************************************************/
FT_EXPORT_DEF(FT_Error) FT_Done_Library( FT_Library library );
/*************************************************************************
*
* <Function>
* FT_Set_Debug_Hook
*
* <Description>
* Used only by the TrueType debugger. This function is private and
* should never be called by normal applications..
*
* <Input>
* library :: handle to target library object
* hook_index :: hook index
* debug_hook :: debug hook functions
*
*************************************************************************/
typedef void (*FT_DebugHook_Func)( void* arg );
FT_EXPORT_DEF(void) FT_Set_Debug_Hook( FT_Library library,
FT_UInt hook_index,
FT_DebugHook_Func debug_hook );
/*************************************************************************/
/* */
/* <Function> */
/* FT_Add_Default_Modules */
/* */
/* <Description> */
/* Adds the set of default modules to a given library object. */
/* This is only useful when you create a library object with */
/* FT_New_Library (usually to plug a custom memory manager) */
/* */
/* <Input> */
/* library :: A handle to a new library object. */
/* */
FT_EXPORT_DEF(void) FT_Add_Default_Modules( FT_Library library );
#endif /* FTMODULE_H */
/* END */
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