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usr/include/freetype2/freetype/ftmodapi.h 0000644 00000112171 14720554535 0014521 0 ustar 00 /***************************************************************************/ /* */ /* ftmodapi.h */ /* */ /* FreeType modules public interface (specification). */ /* */ /* Copyright 1996-2018 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 section * @properties. * * 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 section @properties. * * @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 section * @properties. * * @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 section @properties. * * @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 section @properties */ /* 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. */ /* */ /* <Since> */ /* 2.8 */ /* */ 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 */
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