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/***************************************************************************/
/* */
/* ftmodapi.h */
/* */
/* FreeType modules public interface (specification). */
/* */
/* Copyright 1996-2017 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 FTMODAPI_H_
#define FTMODAPI_H_
#include <ft2build.h>
#include FT_FREETYPE_H
#ifdef FREETYPE_H
#error "freetype.h of FreeType 1 has been loaded!"
#error "Please fix the directory search order for header files"
#error "so that freetype.h of FreeType 2 is found first."
#endif
FT_BEGIN_HEADER
/*************************************************************************/
/* */
/* <Section> */
/* module_management */
/* */
/* <Title> */
/* Module Management */
/* */
/* <Abstract> */
/* How to add, upgrade, remove, and control modules from FreeType. */
/* */
/* <Description> */
/* The definitions below are used to manage modules within FreeType. */
/* Modules can be added, upgraded, and removed at runtime. */
/* Additionally, some module properties can be controlled also. */
/* */
/* Here is a list of possible values of the `module_name' field in */
/* the @FT_Module_Class structure. */
/* */
/* { */
/* autofitter */
/* bdf */
/* cff */
/* gxvalid */
/* otvalid */
/* pcf */
/* pfr */
/* psaux */
/* pshinter */
/* psnames */
/* raster1 */
/* sfnt */
/* smooth, smooth-lcd, smooth-lcdv */
/* truetype */
/* type1 */
/* type42 */
/* t1cid */
/* winfonts */
/* } */
/* */
/* Note that the FreeType Cache sub-system is not a FreeType module. */
/* */
/* <Order> */
/* FT_Module */
/* FT_Module_Constructor */
/* FT_Module_Destructor */
/* FT_Module_Requester */
/* FT_Module_Class */
/* */
/* FT_Add_Module */
/* FT_Get_Module */
/* FT_Remove_Module */
/* FT_Add_Default_Modules */
/* */
/* FT_Property_Set */
/* FT_Property_Get */
/* FT_Set_Default_Properties */
/* */
/* FT_New_Library */
/* FT_Done_Library */
/* FT_Reference_Library */
/* */
/* FT_Renderer */
/* FT_Renderer_Class */
/* */
/* FT_Get_Renderer */
/* FT_Set_Renderer */
/* */
/* FT_Set_Debug_Hook */
/* */
/*************************************************************************/
/* module bit flags */
#define FT_MODULE_FONT_DRIVER 1 /* this module is a font driver */
#define FT_MODULE_RENDERER 2 /* this module is a renderer */
#define FT_MODULE_HINTER 4 /* this module is a glyph hinter */
#define FT_MODULE_STYLER 8 /* this module is a styler */
#define FT_MODULE_DRIVER_SCALABLE 0x100 /* the driver supports */
/* scalable fonts */
#define FT_MODULE_DRIVER_NO_OUTLINES 0x200 /* the driver does not */
/* support vector outlines */
#define FT_MODULE_DRIVER_HAS_HINTER 0x400 /* the driver provides its */
/* own hinter */
#define FT_MODULE_DRIVER_HINTS_LIGHTLY 0x800 /* the driver's hinter */
/* produces LIGHT hints */
/* deprecated values */
#define ft_module_font_driver FT_MODULE_FONT_DRIVER
#define ft_module_renderer FT_MODULE_RENDERER
#define ft_module_hinter FT_MODULE_HINTER
#define ft_module_styler FT_MODULE_STYLER
#define ft_module_driver_scalable FT_MODULE_DRIVER_SCALABLE
#define ft_module_driver_no_outlines FT_MODULE_DRIVER_NO_OUTLINES
#define ft_module_driver_has_hinter FT_MODULE_DRIVER_HAS_HINTER
#define ft_module_driver_hints_lightly FT_MODULE_DRIVER_HINTS_LIGHTLY
typedef FT_Pointer FT_Module_Interface;
/*************************************************************************/
/* */
/* <FuncType> */
/* FT_Module_Constructor */
/* */
/* <Description> */
/* A function used to initialize (not create) a new module object. */
/* */
/* <Input> */
/* module :: The module to initialize. */
/* */
typedef FT_Error
(*FT_Module_Constructor)( FT_Module module );
/*************************************************************************/
/* */
/* <FuncType> */
/* FT_Module_Destructor */
/* */
/* <Description> */
/* A function used to finalize (not destroy) a given module object. */
/* */
/* <Input> */
/* module :: The module to finalize. */
/* */
typedef void
(*FT_Module_Destructor)( FT_Module module );
/*************************************************************************/
/* */
/* <FuncType> */
/* FT_Module_Requester */
/* */
/* <Description> */
/* A function used to query a given module for a specific interface. */
/* */
/* <Input> */
/* module :: The module to be searched. */
/* */
/* name :: The name of the interface in the 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 :: The size of one module object/instance in */
/* bytes. */
/* */
/* module_name :: The name of the module. */
/* */
/* module_version :: The version, as a 16.16 fixed number */
/* (major.minor). */
/* */
/* module_requires :: The version of FreeType this module requires, */
/* as a 16.16 fixed number (major.minor). Starts */
/* at version 2.0, i.e., 0x20000. */
/* */
/* module_init :: The initializing function. */
/* */
/* module_done :: The finalizing function. */
/* */
/* get_interface :: The interface requesting function. */
/* */
typedef struct FT_Module_Class_
{
FT_ULong module_flags;
FT_Long 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. */
/* */
/* <InOut> */
/* library :: A handle to the library object. */
/* */
/* <Input> */
/* clazz :: A pointer to class descriptor for the module. */
/* */
/* <Return> */
/* FreeType 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( 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 :: A handle to the library object. */
/* */
/* module_name :: The module's name (as an ASCII string). */
/* */
/* <Return> */
/* A module handle. 0~if none was found. */
/* */
/* <Note> */
/* FreeType's internal modules aren't documented very well, and you */
/* should look up the source code for details. */
/* */
FT_EXPORT( FT_Module )
FT_Get_Module( FT_Library library,
const char* module_name );
/*************************************************************************/
/* */
/* <Function> */
/* FT_Remove_Module */
/* */
/* <Description> */
/* Remove a given module from a library instance. */
/* */
/* <InOut> */
/* library :: A handle to a library object. */
/* */
/* <Input> */
/* module :: A handle to a module object. */
/* */
/* <Return> */
/* FreeType error code. 0~means success. */
/* */
/* <Note> */
/* The module object is destroyed by the function in case of success. */
/* */
FT_EXPORT( FT_Error )
FT_Remove_Module( FT_Library library,
FT_Module module );
/**********************************************************************
*
* @function:
* FT_Property_Set
*
* @description:
* Set a property for a given module.
*
* @input:
* library ::
* A handle to the library the module is part of.
*
* module_name ::
* The module name.
*
* property_name ::
* The property name. Properties are described in the `Synopsis'
* subsection of the module's documentation.
*
* Note that only a few modules have properties.
*
* value ::
* A generic pointer to a variable or structure that gives the new
* value of the property. The exact definition of `value' is
* dependent on the property; see the `Synopsis' subsection of the
* module's documentation.
*
* @return:
* FreeType error code. 0~means success.
*
* @note:
* If `module_name' isn't a valid module name, or `property_name'
* doesn't specify a valid property, or if `value' doesn't represent a
* valid value for the given property, an error is returned.
*
* The following example sets property `bar' (a simple integer) in
* module `foo' to value~1.
*
* {
* FT_UInt bar;
*
*
* bar = 1;
* FT_Property_Set( library, "foo", "bar", &bar );
* }
*
* Note that the FreeType Cache sub-system doesn't recognize module
* property changes. To avoid glyph lookup confusion within the cache
* you should call @FTC_Manager_Reset to completely flush the cache if
* a module property gets changed after @FTC_Manager_New has been
* called.
*
* It is not possible to set properties of the FreeType Cache
* sub-system itself with FT_Property_Set; use @FTC_Property_Set
* instead.
*
* @since:
* 2.4.11
*
*/
FT_EXPORT( FT_Error )
FT_Property_Set( FT_Library library,
const FT_String* module_name,
const FT_String* property_name,
const void* value );
/**********************************************************************
*
* @function:
* FT_Property_Get
*
* @description:
* Get a module's property value.
*
* @input:
* library ::
* A handle to the library the module is part of.
*
* module_name ::
* The module name.
*
* property_name ::
* The property name. Properties are described in the `Synopsis'
* subsection of the module's documentation.
*
* @inout:
* value ::
* A generic pointer to a variable or structure that gives the
* value of the property. The exact definition of `value' is
* dependent on the property; see the `Synopsis' subsection of the
* module's documentation.
*
* @return:
* FreeType error code. 0~means success.
*
* @note:
* If `module_name' isn't a valid module name, or `property_name'
* doesn't specify a valid property, or if `value' doesn't represent a
* valid value for the given property, an error is returned.
*
* The following example gets property `baz' (a range) in module `foo'.
*
* {
* typedef range_
* {
* FT_Int32 min;
* FT_Int32 max;
*
* } range;
*
* range baz;
*
*
* FT_Property_Get( library, "foo", "baz", &baz );
* }
*
* It is not possible to retrieve properties of the FreeType Cache
* sub-system with FT_Property_Get; use @FTC_Property_Get instead.
*
* @since:
* 2.4.11
*
*/
FT_EXPORT( FT_Error )
FT_Property_Get( FT_Library library,
const FT_String* module_name,
const FT_String* property_name,
void* value );
/*************************************************************************/
/* */
/* <Function> */
/* FT_Set_Default_Properties */
/* */
/* <Description> */
/* If compilation option FT_CONFIG_OPTION_ENVIRONMENT_PROPERTIES is */
/* set, this function reads the `FREETYPE_PROPERTIES' environment */
/* variable to control driver properties. See sections @auto_hinter, */
/* @cff_driver, @pcf_driver, and @tt_driver for more. */
/* */
/* If the compilation option is not set, this function does nothing. */
/* */
/* `FREETYPE_PROPERTIES' has the following syntax form (broken here */
/* into multiple lines for better readability). */
/* */
/* { */
/* <optional whitespace> */
/* <module-name1> ':' */
/* <property-name1> '=' <property-value1> */
/* <whitespace> */
/* <module-name2> ':' */
/* <property-name2> '=' <property-value2> */
/* ... */
/* } */
/* */
/* Example: */
/* */
/* { */
/* FREETYPE_PROPERTIES=truetype:interpreter-version=35 \ */
/* cff:no-stem-darkening=1 \ */
/* autofitter:warping=1 */
/* } */
/* */
/* <InOut> */
/* library :: A handle to a new library object. */
/* */
FT_EXPORT( void )
FT_Set_Default_Properties( FT_Library library );
/*************************************************************************/
/* */
/* <Function> */
/* FT_Reference_Library */
/* */
/* <Description> */
/* A counter gets initialized to~1 at the time an @FT_Library */
/* structure is created. This function increments the counter. */
/* @FT_Done_Library then only destroys a library if the counter is~1, */
/* otherwise it simply decrements the counter. */
/* */
/* This function helps in managing life-cycles of structures that */
/* reference @FT_Library objects. */
/* */
/* <Input> */
/* library :: A handle to a target library object. */
/* */
/* <Return> */
/* FreeType error code. 0~means success. */
/* */
/* <Since> */
/* 2.4.2 */
/* */
FT_EXPORT( FT_Error )
FT_Reference_Library( FT_Library library );
/*************************************************************************/
/* */
/* <Function> */
/* FT_New_Library */
/* */
/* <Description> */
/* This function is used to create a new FreeType library instance */
/* from a given memory object. It is thus possible to use libraries */
/* with distinct memory allocators within the same program. Note, */
/* however, that the used @FT_Memory structure is expected to remain */
/* valid for the life of the @FT_Library object. */
/* */
/* Normally, you would call this function (followed by a call to */
/* @FT_Add_Default_Modules or a series of calls to @FT_Add_Module, */
/* and a call to @FT_Set_Default_Properties) instead of */
/* @FT_Init_FreeType to initialize the FreeType library. */
/* */
/* Don't use @FT_Done_FreeType but @FT_Done_Library to destroy a */
/* library instance. */
/* */
/* <Input> */
/* memory :: A handle to the original memory object. */
/* */
/* <Output> */
/* alibrary :: A pointer to handle of a new library object. */
/* */
/* <Return> */
/* FreeType error code. 0~means success. */
/* */
/* <Note> */
/* See the discussion of reference counters in the description of */
/* @FT_Reference_Library. */
/* */
FT_EXPORT( FT_Error )
FT_New_Library( FT_Memory memory,
FT_Library *alibrary );
/*************************************************************************/
/* */
/* <Function> */
/* FT_Done_Library */
/* */
/* <Description> */
/* Discard a given library object. This closes all drivers and */
/* discards all resource objects. */
/* */
/* <Input> */
/* library :: A handle to the target library. */
/* */
/* <Return> */
/* FreeType error code. 0~means success. */
/* */
/* <Note> */
/* See the discussion of reference counters in the description of */
/* @FT_Reference_Library. */
/* */
FT_EXPORT( FT_Error )
FT_Done_Library( FT_Library library );
/* */
typedef void
(*FT_DebugHook_Func)( void* arg );
/*************************************************************************/
/* */
/* <Function> */
/* FT_Set_Debug_Hook */
/* */
/* <Description> */
/* Set a debug hook function for debugging the interpreter of a font */
/* format. */
/* */
/* <InOut> */
/* library :: A handle to the library object. */
/* */
/* <Input> */
/* hook_index :: The index of the debug hook. You should use the */
/* values defined in `ftobjs.h', e.g., */
/* `FT_DEBUG_HOOK_TRUETYPE'. */
/* */
/* debug_hook :: The function used to debug the interpreter. */
/* */
/* <Note> */
/* Currently, four debug hook slots are available, but only two (for */
/* the TrueType and the Type~1 interpreter) are defined. */
/* */
/* Since the internal headers of FreeType are no longer installed, */
/* the symbol `FT_DEBUG_HOOK_TRUETYPE' isn't available publicly. */
/* This is a bug and will be fixed in a forthcoming release. */
/* */
FT_EXPORT( void )
FT_Set_Debug_Hook( FT_Library library,
FT_UInt hook_index,
FT_DebugHook_Func debug_hook );
/*************************************************************************/
/* */
/* <Function> */
/* FT_Add_Default_Modules */
/* */
/* <Description> */
/* Add the set of default drivers 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). */
/* */
/* <InOut> */
/* library :: A handle to a new library object. */
/* */
FT_EXPORT( void )
FT_Add_Default_Modules( FT_Library library );
/**************************************************************************
*
* @section:
* truetype_engine
*
* @title:
* The TrueType Engine
*
* @abstract:
* TrueType bytecode support.
*
* @description:
* This section contains a function used to query the level of TrueType
* bytecode support compiled in this version of the library.
*
*/
/**************************************************************************
*
* @enum:
* FT_TrueTypeEngineType
*
* @description:
* A list of values describing which kind of TrueType bytecode
* engine is implemented in a given FT_Library instance. It is used
* by the @FT_Get_TrueType_Engine_Type function.
*
* @values:
* FT_TRUETYPE_ENGINE_TYPE_NONE ::
* The library doesn't implement any kind of bytecode interpreter.
*
* FT_TRUETYPE_ENGINE_TYPE_UNPATENTED ::
* Deprecated and removed.
*
* FT_TRUETYPE_ENGINE_TYPE_PATENTED ::
* The library implements a bytecode interpreter that covers
* the full instruction set of the TrueType virtual machine (this
* was governed by patents until May 2010, hence the name).
*
* @since:
* 2.2
*
*/
typedef enum FT_TrueTypeEngineType_
{
FT_TRUETYPE_ENGINE_TYPE_NONE = 0,
FT_TRUETYPE_ENGINE_TYPE_UNPATENTED,
FT_TRUETYPE_ENGINE_TYPE_PATENTED
} FT_TrueTypeEngineType;
/**************************************************************************
*
* @func:
* FT_Get_TrueType_Engine_Type
*
* @description:
* Return an @FT_TrueTypeEngineType value to indicate which level of
* the TrueType virtual machine a given library instance supports.
*
* @input:
* library ::
* A library instance.
*
* @return:
* A value indicating which level is supported.
*
* @since:
* 2.2
*
*/
FT_EXPORT( FT_TrueTypeEngineType )
FT_Get_TrueType_Engine_Type( FT_Library library );
/* */
FT_END_HEADER
#endif /* FTMODAPI_H_ */
/* END */