786 lines
21 KiB
C
786 lines
21 KiB
C
/****************************************************************************
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*
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* ftmodapi.h
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*
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* FreeType modules public interface (specification).
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*
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* Copyright (C) 1996-2020 by
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* David Turner, Robert Wilhelm, and Werner Lemberg.
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*
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* This file is part of the FreeType project, and may only be used,
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* modified, and distributed under the terms of the FreeType project
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* license, LICENSE.TXT. By continuing to use, modify, or distribute
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* this file you indicate that you have read the license and
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* understand and accept it fully.
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*
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*/
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#ifndef FTMODAPI_H_
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#define FTMODAPI_H_
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#include <ft2build.h>
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#include FT_FREETYPE_H
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#ifdef FREETYPE_H
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#error "freetype.h of FreeType 1 has been loaded!"
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#error "Please fix the directory search order for header files"
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#error "so that freetype.h of FreeType 2 is found first."
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#endif
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FT_BEGIN_HEADER
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/**************************************************************************
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*
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* @section:
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* module_management
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*
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* @title:
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* Module Management
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*
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* @abstract:
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* How to add, upgrade, remove, and control modules from FreeType.
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*
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* @description:
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* The definitions below are used to manage modules within FreeType.
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* Modules can be added, upgraded, and removed at runtime. Additionally,
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* some module properties can be controlled also.
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*
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* Here is a list of possible values of the `module_name` field in the
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* @FT_Module_Class structure.
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*
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* ```
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* autofitter
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* bdf
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* cff
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* gxvalid
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* otvalid
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* pcf
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* pfr
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* psaux
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* pshinter
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* psnames
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* raster1
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* sfnt
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* smooth, smooth-lcd, smooth-lcdv
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* truetype
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* type1
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* type42
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* t1cid
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* winfonts
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* ```
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*
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* Note that the FreeType Cache sub-system is not a FreeType module.
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*
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* @order:
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* FT_Module
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* FT_Module_Constructor
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* FT_Module_Destructor
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* FT_Module_Requester
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* FT_Module_Class
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*
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* FT_Add_Module
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* FT_Get_Module
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* FT_Remove_Module
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* FT_Add_Default_Modules
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*
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* FT_Property_Set
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* FT_Property_Get
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* FT_Set_Default_Properties
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*
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* FT_New_Library
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* FT_Done_Library
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* FT_Reference_Library
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*
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* FT_Renderer
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* FT_Renderer_Class
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*
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* FT_Get_Renderer
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* FT_Set_Renderer
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*
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* FT_Set_Debug_Hook
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*
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*/
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/* module bit flags */
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#define FT_MODULE_FONT_DRIVER 1 /* this module is a font driver */
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#define FT_MODULE_RENDERER 2 /* this module is a renderer */
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#define FT_MODULE_HINTER 4 /* this module is a glyph hinter */
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#define FT_MODULE_STYLER 8 /* this module is a styler */
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#define FT_MODULE_DRIVER_SCALABLE 0x100 /* the driver supports */
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/* scalable fonts */
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#define FT_MODULE_DRIVER_NO_OUTLINES 0x200 /* the driver does not */
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/* support vector outlines */
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#define FT_MODULE_DRIVER_HAS_HINTER 0x400 /* the driver provides its */
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/* own hinter */
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#define FT_MODULE_DRIVER_HINTS_LIGHTLY 0x800 /* the driver's hinter */
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/* produces LIGHT hints */
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/* deprecated values */
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#define ft_module_font_driver FT_MODULE_FONT_DRIVER
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#define ft_module_renderer FT_MODULE_RENDERER
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#define ft_module_hinter FT_MODULE_HINTER
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#define ft_module_styler FT_MODULE_STYLER
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#define ft_module_driver_scalable FT_MODULE_DRIVER_SCALABLE
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#define ft_module_driver_no_outlines FT_MODULE_DRIVER_NO_OUTLINES
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#define ft_module_driver_has_hinter FT_MODULE_DRIVER_HAS_HINTER
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#define ft_module_driver_hints_lightly FT_MODULE_DRIVER_HINTS_LIGHTLY
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typedef FT_Pointer FT_Module_Interface;
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/**************************************************************************
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*
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* @functype:
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* FT_Module_Constructor
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*
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* @description:
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* A function used to initialize (not create) a new module object.
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*
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* @input:
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* module ::
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* The module to initialize.
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*/
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typedef FT_Error
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(*FT_Module_Constructor)( FT_Module module );
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/**************************************************************************
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*
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* @functype:
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* FT_Module_Destructor
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*
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* @description:
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* A function used to finalize (not destroy) a given module object.
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*
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* @input:
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* module ::
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* The module to finalize.
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*/
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typedef void
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(*FT_Module_Destructor)( FT_Module module );
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/**************************************************************************
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*
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* @functype:
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* FT_Module_Requester
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*
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* @description:
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* A function used to query a given module for a specific interface.
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*
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* @input:
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* module ::
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* The module to be searched.
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*
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* name ::
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* The name of the interface in the module.
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*/
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typedef FT_Module_Interface
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(*FT_Module_Requester)( FT_Module module,
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const char* name );
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/**************************************************************************
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*
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* @struct:
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* FT_Module_Class
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*
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* @description:
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* The module class descriptor. While being a public structure necessary
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* for FreeType's module bookkeeping, most of the fields are essentially
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* internal, not to be used directly by an application.
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*
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* @fields:
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* module_flags ::
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* Bit flags describing the module.
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*
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* module_size ::
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* The size of one module object/instance in bytes.
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*
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* module_name ::
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* The name of the module.
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*
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* module_version ::
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* The version, as a 16.16 fixed number (major.minor).
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*
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* module_requires ::
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* The version of FreeType this module requires, as a 16.16 fixed
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* number (major.minor). Starts at version 2.0, i.e., 0x20000.
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*
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* module_interface ::
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* A typeless pointer to a structure (which varies between different
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* modules) that holds the module's interface functions. This is
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* essentially what `get_interface` returns.
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*
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* module_init ::
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* The initializing function.
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*
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* module_done ::
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* The finalizing function.
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*
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* get_interface ::
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* The interface requesting function.
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*/
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typedef struct FT_Module_Class_
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{
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FT_ULong module_flags;
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FT_Long module_size;
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const FT_String* module_name;
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FT_Fixed module_version;
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FT_Fixed module_requires;
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const void* module_interface;
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FT_Module_Constructor module_init;
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FT_Module_Destructor module_done;
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FT_Module_Requester get_interface;
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} FT_Module_Class;
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/**************************************************************************
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*
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* @function:
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* FT_Add_Module
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*
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* @description:
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* Add a new module to a given library instance.
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*
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* @inout:
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* library ::
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* A handle to the library object.
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*
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* @input:
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* clazz ::
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* A pointer to class descriptor for the module.
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*
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* @return:
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* FreeType error code. 0~means success.
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*
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* @note:
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* An error will be returned if a module already exists by that name, or
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* if the module requires a version of FreeType that is too great.
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*/
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FT_EXPORT( FT_Error )
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FT_Add_Module( FT_Library library,
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const FT_Module_Class* clazz );
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/**************************************************************************
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*
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* @function:
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* FT_Get_Module
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*
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* @description:
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* Find a module by its name.
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*
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* @input:
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* library ::
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* A handle to the library object.
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*
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* module_name ::
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* The module's name (as an ASCII string).
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*
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* @return:
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* A module handle. 0~if none was found.
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*
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* @note:
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* FreeType's internal modules aren't documented very well, and you
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* should look up the source code for details.
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*/
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FT_EXPORT( FT_Module )
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FT_Get_Module( FT_Library library,
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const char* module_name );
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/**************************************************************************
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*
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* @function:
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* FT_Remove_Module
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*
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* @description:
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* Remove a given module from a library instance.
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*
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* @inout:
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* library ::
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* A handle to a library object.
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*
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* @input:
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* module ::
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* A handle to a module object.
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*
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* @return:
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* FreeType error code. 0~means success.
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*
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* @note:
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* The module object is destroyed by the function in case of success.
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*/
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FT_EXPORT( FT_Error )
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FT_Remove_Module( FT_Library library,
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FT_Module module );
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/**************************************************************************
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*
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* @function:
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* FT_Property_Set
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*
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* @description:
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* Set a property for a given module.
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*
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* @input:
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* library ::
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* A handle to the library the module is part of.
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*
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* module_name ::
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* The module name.
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*
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* property_name ::
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* The property name. Properties are described in section
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* @properties.
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*
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* Note that only a few modules have properties.
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*
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* value ::
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* A generic pointer to a variable or structure that gives the new
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* value of the property. The exact definition of `value` is
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* dependent on the property; see section @properties.
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*
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* @return:
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* FreeType error code. 0~means success.
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*
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* @note:
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* If `module_name` isn't a valid module name, or `property_name`
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* doesn't specify a valid property, or if `value` doesn't represent a
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* valid value for the given property, an error is returned.
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*
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* The following example sets property 'bar' (a simple integer) in
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* module 'foo' to value~1.
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*
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* ```
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* FT_UInt bar;
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*
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*
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* bar = 1;
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* FT_Property_Set( library, "foo", "bar", &bar );
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* ```
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*
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* Note that the FreeType Cache sub-system doesn't recognize module
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* property changes. To avoid glyph lookup confusion within the cache
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* you should call @FTC_Manager_Reset to completely flush the cache if a
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* module property gets changed after @FTC_Manager_New has been called.
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*
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* It is not possible to set properties of the FreeType Cache sub-system
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* itself with FT_Property_Set; use @FTC_Property_Set instead.
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*
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* @since:
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* 2.4.11
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*
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*/
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FT_EXPORT( FT_Error )
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FT_Property_Set( FT_Library library,
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const FT_String* module_name,
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const FT_String* property_name,
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const void* value );
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/**************************************************************************
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*
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* @function:
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* FT_Property_Get
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*
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* @description:
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* Get a module's property value.
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*
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* @input:
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* library ::
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* A handle to the library the module is part of.
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*
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* module_name ::
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* The module name.
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*
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* property_name ::
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* The property name. Properties are described in section
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* @properties.
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*
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* @inout:
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* value ::
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* A generic pointer to a variable or structure that gives the value
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* of the property. The exact definition of `value` is dependent on
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* the property; see section @properties.
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*
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* @return:
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* FreeType error code. 0~means success.
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*
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* @note:
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* If `module_name` isn't a valid module name, or `property_name`
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* doesn't specify a valid property, or if `value` doesn't represent a
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* valid value for the given property, an error is returned.
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*
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* The following example gets property 'baz' (a range) in module 'foo'.
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*
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* ```
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* typedef range_
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* {
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* FT_Int32 min;
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* FT_Int32 max;
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*
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* } range;
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*
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* range baz;
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*
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*
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* FT_Property_Get( library, "foo", "baz", &baz );
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* ```
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*
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* It is not possible to retrieve properties of the FreeType Cache
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* sub-system with FT_Property_Get; use @FTC_Property_Get instead.
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*
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* @since:
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* 2.4.11
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*
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*/
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FT_EXPORT( FT_Error )
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FT_Property_Get( FT_Library library,
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const FT_String* module_name,
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const FT_String* property_name,
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void* value );
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|
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/**************************************************************************
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*
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* @function:
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* FT_Set_Default_Properties
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*
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* @description:
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* If compilation option `FT_CONFIG_OPTION_ENVIRONMENT_PROPERTIES` is
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* set, this function reads the `FREETYPE_PROPERTIES` environment
|
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* variable to control driver properties. See section @properties for
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* more.
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*
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* If the compilation option is not set, this function does nothing.
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*
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* `FREETYPE_PROPERTIES` has the following syntax form (broken here into
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* multiple lines for better readability).
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*
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* ```
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* <optional whitespace>
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* <module-name1> ':'
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* <property-name1> '=' <property-value1>
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* <whitespace>
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* <module-name2> ':'
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* <property-name2> '=' <property-value2>
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* ...
|
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* ```
|
|
*
|
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* Example:
|
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*
|
|
* ```
|
|
* FREETYPE_PROPERTIES=truetype:interpreter-version=35 \
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* cff:no-stem-darkening=1 \
|
|
* autofitter:warping=1
|
|
* ```
|
|
*
|
|
* @inout:
|
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* library ::
|
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* A handle to a new library object.
|
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*
|
|
* @since:
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* 2.8
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*/
|
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FT_EXPORT( void )
|
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FT_Set_Default_Properties( FT_Library library );
|
|
|
|
|
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/**************************************************************************
|
|
*
|
|
* @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 );
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/**************************************************************************
|
|
*
|
|
* @functype:
|
|
* FT_DebugHook_Func
|
|
*
|
|
* @description:
|
|
* A drop-in replacement (or rather a wrapper) for the bytecode or
|
|
* charstring interpreter's main loop function.
|
|
*
|
|
* Its job is essentially
|
|
*
|
|
* - to activate debug mode to enforce single-stepping,
|
|
*
|
|
* - to call the main loop function to interpret the next opcode, and
|
|
*
|
|
* - to show the changed context to the user.
|
|
*
|
|
* An example for such a main loop function is `TT_RunIns` (declared in
|
|
* FreeType's internal header file `src/truetype/ttinterp.h`).
|
|
*
|
|
* Have a look at the source code of the `ttdebug` FreeType demo program
|
|
* for an example of a drop-in replacement.
|
|
*
|
|
* @inout:
|
|
* arg ::
|
|
* A typeless pointer, to be cast to the main loop function's data
|
|
* structure (which depends on the font module). For TrueType fonts
|
|
* it is bytecode interpreter's execution context, `TT_ExecContext`,
|
|
* which is declared in FreeType's internal header file `tttypes.h`.
|
|
*/
|
|
typedef FT_Error
|
|
(*FT_DebugHook_Func)( void* arg );
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|
|
|
|
|
/**************************************************************************
|
|
*
|
|
* @enum:
|
|
* FT_DEBUG_HOOK_XXX
|
|
*
|
|
* @description:
|
|
* A list of named debug hook indices.
|
|
*
|
|
* @values:
|
|
* FT_DEBUG_HOOK_TRUETYPE::
|
|
* This hook index identifies the TrueType bytecode debugger.
|
|
*/
|
|
#define FT_DEBUG_HOOK_TRUETYPE 0
|
|
|
|
|
|
/**************************************************************************
|
|
*
|
|
* @function:
|
|
* FT_Set_Debug_Hook
|
|
*
|
|
* @description:
|
|
* Set a debug hook function for debugging the interpreter of a font
|
|
* format.
|
|
*
|
|
* While this is a public API function, an application needs access to
|
|
* FreeType's internal header files to do something useful.
|
|
*
|
|
* Have a look at the source code of the `ttdebug` FreeType demo program
|
|
* for an example of its usage.
|
|
*
|
|
* @inout:
|
|
* library ::
|
|
* A handle to the library object.
|
|
*
|
|
* @input:
|
|
* hook_index ::
|
|
* The index of the debug hook. You should use defined enumeration
|
|
* macros like @FT_DEBUG_HOOK_TRUETYPE.
|
|
*
|
|
* debug_hook ::
|
|
* The function used to debug the interpreter.
|
|
*
|
|
* @note:
|
|
* Currently, four debug hook slots are available, but only one (for the
|
|
* TrueType interpreter) is defined.
|
|
*/
|
|
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;
|
|
|
|
|
|
/**************************************************************************
|
|
*
|
|
* @function:
|
|
* 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 */
|