670 lines
34 KiB
C
670 lines
34 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 1996-2015 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. */
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/* Additionally, 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 */
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/* the @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, raster5 */
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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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/* */
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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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/* 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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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 :: 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 :: 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 :: The module to be searched. */
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/* */
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/* name :: 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. */
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/* */
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/* <Fields> */
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/* module_flags :: Bit flags describing the module. */
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/* */
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/* module_size :: The size of one module object/instance in */
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/* bytes. */
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/* */
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/* module_name :: The name of the module. */
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/* */
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/* module_version :: The version, as a 16.16 fixed number */
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/* (major.minor). */
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/* */
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/* module_requires :: The version of FreeType this module requires, */
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/* as a 16.16 fixed number (major.minor). Starts */
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/* at version 2.0, i.e., 0x20000. */
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/* */
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/* module_init :: The initializing function. */
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/* */
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/* module_done :: The finalizing function. */
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/* */
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/* get_interface :: 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 :: A handle to the library object. */
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/* */
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/* <Input> */
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/* clazz :: 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, */
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/* or 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 :: A handle to the library object. */
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/* */
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/* module_name :: 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 :: A handle to a library object. */
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/* */
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/* <Input> */
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/* module :: 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 the `Synopsis'
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* subsection of the module's documentation.
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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 the `Synopsis' subsection of the
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* module's documentation.
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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
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* a module property gets changed after @FTC_Manager_New has been
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* called.
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*
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* It is not possible to set properties of the FreeType Cache
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* sub-system itself with FT_Property_Set; use @FTC_Property_Set
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* 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 the `Synopsis'
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* subsection of the module's documentation.
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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
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* value of the property. The exact definition of `value' is
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* dependent on the property; see the `Synopsis' subsection of the
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* module's documentation.
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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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/* <Function> */
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/* FT_Reference_Library */
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/* */
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/* <Description> */
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/* A counter gets initialized to~1 at the time an @FT_Library */
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/* structure is created. This function increments the counter. */
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/* @FT_Done_Library then only destroys a library if the counter is~1, */
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/* otherwise it simply decrements the counter. */
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/* */
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/* This function helps in managing life-cycles of structures that */
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/* reference @FT_Library objects. */
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/* */
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/* <Input> */
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/* library :: A handle to a target library 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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/* <Since> */
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/* 2.4.2 */
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/* */
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FT_EXPORT( FT_Error )
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FT_Reference_Library( FT_Library library );
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/*************************************************************************/
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/* */
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/* <Function> */
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/* FT_New_Library */
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/* */
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/* <Description> */
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/* This function is used to create a new FreeType library instance */
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/* from a given memory object. It is thus possible to use libraries */
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/* with distinct memory allocators within the same program. Note, */
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/* however, that the used @FT_Memory structure is expected to remain */
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/* valid for the life of the @FT_Library object. */
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/* */
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/* Normally, you would call this function (followed by a call to */
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/* @FT_Add_Default_Modules or a series of calls to @FT_Add_Module) */
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/* instead of @FT_Init_FreeType to initialize the FreeType library. */
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/* */
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/* Don't use @FT_Done_FreeType but @FT_Done_Library to destroy a */
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/* library instance. */
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/* */
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/* <Input> */
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/* memory :: A handle to the original memory object. */
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/* */
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/* <Output> */
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/* alibrary :: A pointer to handle of a new library 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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/* See the discussion of reference counters in the description of */
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/* @FT_Reference_Library. */
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/* */
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FT_EXPORT( FT_Error )
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FT_New_Library( FT_Memory memory,
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FT_Library *alibrary );
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/*************************************************************************/
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/* */
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/* <Function> */
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/* FT_Done_Library */
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/* */
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/* <Description> */
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/* Discard a given library object. This closes all drivers and */
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/* discards all resource objects. */
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/* */
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/* <Input> */
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/* library :: A handle to the target library. */
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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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/* See the discussion of reference counters in the description of */
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/* @FT_Reference_Library. */
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/* */
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FT_EXPORT( FT_Error )
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FT_Done_Library( FT_Library library );
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/* */
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typedef void
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(*FT_DebugHook_Func)( void* arg );
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/*************************************************************************/
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/* */
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/* <Function> */
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/* FT_Set_Debug_Hook */
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/* */
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/* <Description> */
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/* Set a debug hook function for debugging the interpreter of a font */
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/* format. */
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/* */
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/* <InOut> */
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/* library :: A handle to the library object. */
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/* */
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/* <Input> */
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/* hook_index :: The index of the debug hook. You should use the */
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/* values defined in `ftobjs.h', e.g., */
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/* `FT_DEBUG_HOOK_TRUETYPE'. */
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/* */
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/* debug_hook :: The function used to debug the interpreter. */
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/* */
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/* <Note> */
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/* Currently, four debug hook slots are available, but only two (for */
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/* the TrueType and the Type~1 interpreter) are defined. */
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/* */
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/* Since the internal headers of FreeType are no longer installed, */
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/* the symbol `FT_DEBUG_HOOK_TRUETYPE' isn't available publicly. */
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/* This is a bug and will be fixed in a forthcoming release. */
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/* */
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FT_EXPORT( void )
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FT_Set_Debug_Hook( FT_Library library,
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FT_UInt hook_index,
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FT_DebugHook_Func debug_hook );
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/*************************************************************************/
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/* */
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/* <Function> */
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/* FT_Add_Default_Modules */
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/* */
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/* <Description> */
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/* Add the set of default drivers to a given library object. */
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/* This is only useful when you create a library object with */
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/* @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 ::
|
|
* The library implements a bytecode interpreter that doesn't
|
|
* support the patented operations of the TrueType virtual machine.
|
|
*
|
|
* Its main use is to load certain Asian fonts that position and
|
|
* scale glyph components with bytecode instructions. It produces
|
|
* bad output for most other fonts.
|
|
*
|
|
* 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 */
|