/**************************************************************************** * * ftmodapi.h * * FreeType modules public interface (specification). * * Copyright (C) 1996-2023 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 <freetype/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. * Internal and external modules can be added, upgraded, and removed at * runtime. For example, an alternative renderer or proprietary font * driver can be registered and prioritized. Additionally, some module * properties can also be controlled. * * Here is a list of existing 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 * 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_FACE_DRIVER_NAME * 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 … #define FT_MODULE_RENDERER … #define FT_MODULE_HINTER … #define FT_MODULE_STYLER … #define FT_MODULE_DRIVER_SCALABLE … /* scalable fonts */ #define FT_MODULE_DRIVER_NO_OUTLINES … /* support vector outlines */ #define FT_MODULE_DRIVER_HAS_HINTER … /* own hinter */ #define FT_MODULE_DRIVER_HINTS_LIGHTLY … /* produces LIGHT hints */ /* deprecated values */ #define ft_module_font_driver … #define ft_module_renderer … #define ft_module_hinter … #define ft_module_styler … #define ft_module_driver_scalable … #define ft_module_driver_no_outlines … #define ft_module_driver_has_hinter … #define ft_module_driver_hints_lightly … 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. */ FT_Module_Constructor; /************************************************************************** * * @functype: * FT_Module_Destructor * * @description: * A function used to finalize (not destroy) a given module object. * * @input: * module :: * The module to finalize. */ FT_Module_Destructor; /************************************************************************** * * @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. */ FT_Module_Requester; /************************************************************************** * * @struct: * FT_Module_Class * * @description: * The module class descriptor. While being a public structure necessary * for FreeType's module bookkeeping, most of the fields are essentially * internal, not to be used directly by an application. * * @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_interface :: * A typeless pointer to a structure (which varies between different * modules) that holds the module's interface functions. This is * essentially what `get_interface` returns. * * module_init :: * The initializing function. * * module_done :: * The finalizing function. * * get_interface :: * The interface requesting function. */ 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 ); /************************************************************************** * * @macro: * FT_FACE_DRIVER_NAME * * @description: * A macro that retrieves the name of a font driver from a face object. * * @note: * The font driver name is a valid `module_name` for @FT_Property_Set * and @FT_Property_Get. This is not the same as @FT_Get_Font_Format. * * @since: * 2.11 * */ #define FT_FACE_DRIVER_NAME( face ) … /************************************************************************** * * @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=0 * ``` * * @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 ); /************************************************************************** * * @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`. */ FT_DebugHook_Func; /************************************************************************** * * @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 … /************************************************************************** * * @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 * */ 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 */
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