forked from minhngoc25a/freetype2
480 lines
30 KiB
C
480 lines
30 KiB
C
/***************************************************************************/
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/* */
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/* ftcache.h */
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/* */
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/* FreeType Cache subsystem. */
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/* */
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/* Copyright 1996-2000 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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/*************************************************************************/
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/*************************************************************************/
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/*************************************************************************/
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/*************************************************************************/
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/*************************************************************************/
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/********* *********/
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/********* WARNING, THIS IS ALPHA CODE, THIS API *********/
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/********* IS DUE TO CHANGE UNTIL STRICTLY NOTIFIED BY THE *********/
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/********* FREETYPE DEVELOPMENT TEAM *********/
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/********* *********/
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/*************************************************************************/
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/*************************************************************************/
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/*************************************************************************/
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/*************************************************************************/
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/*************************************************************************/
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#ifndef FTCACHE_H
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#define FTCACHE_H
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#include <freetype/ftglyph.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/*************************************************************************/
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/*************************************************************************/
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/*************************************************************************/
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/***** *****/
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/***** BASIC TYPE DEFINITIONS *****/
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/***** *****/
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/*************************************************************************/
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/*************************************************************************/
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/*************************************************************************/
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/*************************************************************************/
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/* */
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/* <Type> */
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/* FTC_FaceID */
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/* */
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/* <Description> */
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/* A generic pointer type that is used to identity face objects. The */
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/* contents of such objects is application-dependent. */
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/* */
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typedef FT_Pointer FTC_FaceID;
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/*************************************************************************/
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/* */
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/* <FuncType> */
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/* FTC_Face_Requester */
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/* */
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/* <Description> */
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/* A callback function provided by client applications. It is used */
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/* to translate a given FTC_FaceID into a new valid FT_Face object. */
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/* */
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/* <Input> */
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/* face_id :: The face ID to resolve. */
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/* */
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/* library :: A handle to a FreeType library object. */
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/* */
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/* data :: Application-provided request data. */
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/* */
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/* <Output> */
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/* aface :: A new FT_Face handle. */
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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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typedef FT_Error (*FTC_Face_Requester)( FTC_FaceID face_id,
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FT_Library library,
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FT_Pointer request_data,
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FT_Face* aface );
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/*************************************************************************/
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/* */
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/* <Struct> */
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/* FTC_FontRec */
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/* */
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/* <Description> */
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/* A simple structure used to describe a given `font' to the cache */
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/* manager. Note that a `font' is the combination of a given face */
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/* with a given character size. */
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/* */
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/* <Fields> */
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/* face_id :: The ID of the face to use. */
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/* */
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/* pix_width :: The character width in integer pixels. */
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/* */
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/* pix_height :: The character height in integer pixels. */
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/* */
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typedef struct FTC_FontRec_
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{
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FTC_FaceID face_id;
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FT_UShort pix_width;
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FT_UShort pix_height;
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} FTC_FontRec;
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/*************************************************************************/
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/* */
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/* <Type> */
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/* FTC_Font */
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/* */
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/* <Description> */
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/* A simple handle to a FTC_FontRec structure. */
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/* */
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typedef FTC_FontRec* FTC_Font;
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/*************************************************************************/
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/*************************************************************************/
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/*************************************************************************/
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/***** *****/
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/***** CACHE MANAGER OBJECT *****/
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/***** *****/
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/*************************************************************************/
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/*************************************************************************/
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/*************************************************************************/
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/*************************************************************************/
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/* */
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/* <Type> */
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/* FTC_Manager */
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/* */
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/* <Description> */
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/* This object is used to cache one or more FT_Face objects, along */
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/* with corresponding FT_Size objects. */
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/* */
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typedef struct FTC_ManagerRec_* FTC_Manager;
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/*************************************************************************/
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/* */
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/* <Function> */
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/* FTC_Manager_New */
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/* */
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/* <Description> */
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/* Creates a new cache manager. */
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/* */
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/* <Input> */
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/* library :: The parent FreeType library handle to use. */
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/* */
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/* max_faces :: Maximum number of faces to keep alive in manager. */
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/* Use 0 for defaults. */
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/* */
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/* max_sizes :: Maximum number of sizes to keep alive in manager. */
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/* Use 0 for defaults. */
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/* */
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/* max_bytes :: Maximum number of bytes to use for cached data. */
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/* Use 0 for defaults. */
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/* */
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/* requester :: An application-provided callback used to translate */
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/* face IDs into real FT_Face objects. */
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/* */
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/* req_data :: A generic pointer that is passed to the requester */
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/* each time it is called (see FTC_Face_Requester) */
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/* */
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/* <Output> */
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/* amanager :: A handle to a new manager object. 0 in case of */
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/* failure. */
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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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FT_EXPORT_DEF( FT_Error ) FTC_Manager_New( FT_Library library,
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FT_UInt max_faces,
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FT_UInt max_sizes,
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FT_ULong max_bytes,
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FTC_Face_Requester requester,
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FT_Pointer req_data,
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FTC_Manager* amanager );
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/*************************************************************************/
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/* */
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/* <Function> */
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/* FTC_Manager_Reset */
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/* */
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/* <Description> */
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/* Empties a given cache manager. This simply gets rid of all the */
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/* currently cached FT_Face & FT_Size objects within the manager. */
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/* */
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/* <Input> */
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/* manager :: A handle to the manager. */
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/* */
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FT_EXPORT_DEF( void ) FTC_Manager_Reset( FTC_Manager manager );
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/*************************************************************************/
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/* */
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/* <Function> */
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/* FTC_Manager_Done */
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/* */
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/* <Description> */
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/* Destroys a given manager after emptying it. */
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/* */
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/* <Input> */
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/* manager :: A handle to the target cache manager object. */
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/* */
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FT_EXPORT_DEF( void ) FTC_Manager_Done( FTC_Manager manager );
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/*************************************************************************/
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/* */
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/* <Function> */
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/* FTC_Manager_Lookup_Face */
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/* */
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/* <Description> */
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/* Retrieves the FT_Face object that corresponds to a given face ID */
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/* through a cache manager. */
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/* */
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/* <Input> */
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/* manager :: A handle to the cache manager. */
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/* */
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/* face_id :: The ID of the face object. */
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/* */
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/* <Output> */
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/* aface :: A handle to the face 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 returned FT_Face object is always owned by the manager. You */
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/* should never try to discard it yourself. */
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/* */
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/* The FT_Face object doesn't necessarily have a current size object */
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/* (i.e., face->size can be 0). If you need a specific `font size', */
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/* use FTC_Manager_Lookup_Size() instead. */
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/* */
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/* Never change the face's transformation matrix (i.e., never call */
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/* the FT_Set_Transform() function) on a returned face! If you need */
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/* to transform glyphs, do it yourself after glyph loading. */
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/* */
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FT_EXPORT_DEF( FT_Error ) FTC_Manager_Lookup_Face( FTC_Manager manager,
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FTC_FaceID face_id,
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FT_Face* aface );
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/*************************************************************************/
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/* */
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/* <Function> */
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/* FTC_Manager_Lookup_Size */
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/* */
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/* <Description> */
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/* Retrieves the FT_Face & FT_Size objects that correspond to a given */
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/* FTC_SizeID. */
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/* */
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/* <Input> */
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/* manager :: A handle to the cache manager. */
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/* */
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/* size_id :: The ID of the `font size' to use. */
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/* */
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/* <InOut> */
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/* aface :: A pointer to the handle of the face object. Set it to */
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/* zero if you don't need it. */
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/* */
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/* asize :: A pointer to the handle of the size object. Set it to */
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/* zero if you don't need it. */
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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 returned FT_Face object is always owned by the manager. You */
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/* should never try to discard it yourself. */
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/* */
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/* Never change the face's transformation matrix (i.e., never call */
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/* the FT_Set_Transform() function) on a returned face! If you need */
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/* to transform glyphs, do it yourself after glyph loading. */
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/* */
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/* Similarly, the returned FT_Size object is always owned by the */
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/* manager. You should never try to discard it, and never change its */
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/* settings with FT_Set_Pixel_Sizes() or FT_Set_Char_Size()! */
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/* */
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/* The returned size object is the face's current size, which means */
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/* that you can call FT_Load_Glyph() with the face if you need to. */
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/* */
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FT_EXPORT_DEF( FT_Error ) FTC_Manager_Lookup_Size( FTC_Manager manager,
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FTC_Font font,
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FT_Face* aface,
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FT_Size* asize );
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/* a cache class is used to describe a unique cache type to the manager */
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typedef struct FTC_Cache_Class_ FTC_Cache_Class;
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typedef struct FTC_CacheRec_* FTC_Cache;
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/* this must be used internally for the moment */
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FT_EXPORT_DEF( FT_Error ) FTC_Manager_Register_Cache(
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FTC_Manager manager,
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FTC_Cache_Class* clazz,
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FTC_Cache* acache );
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/*************************************************************************/
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/*************************************************************************/
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/*************************************************************************/
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/***** *****/
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/***** IMAGE CACHE OBJECT *****/
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/***** *****/
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/*************************************************************************/
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/*************************************************************************/
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/*************************************************************************/
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#define FTC_IMAGE_FORMAT( x ) ( (x) & 7 )
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/*************************************************************************/
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/* */
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/* <Enum> */
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/* FTC_Image_Type */
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/* */
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/* <Description> */
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/* An enumeration used to list the types of glyph images found in a */
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/* glyph image cache. */
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/* */
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/* <Fields> */
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/* ftc_image_mono :: Monochrome bitmap glyphs. */
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/* */
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/* ftc_image_grays :: Anti-aliased bitmap glyphs. */
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/* */
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/* ftc_image_outline :: Scaled (and hinted) outline glyphs. */
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/* */
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/* ftc_master_outline :: Unscaled original outline glyphs. */
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/* */
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/* <Note> */
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/* Other types may be defined in the future. */
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/* */
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typedef enum FTC_Image_Type_
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{
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ftc_image_format_bitmap = 0,
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ftc_image_format_outline = 1,
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ftc_image_flag_monochrome = 16,
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ftc_image_flag_unhinted = 32,
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ftc_image_flag_autohinted = 64,
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ftc_image_flag_unscaled = 128,
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ftc_image_flag_no_sbits = 256,
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ftc_image_mono = ftc_image_format_bitmap |
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ftc_image_flag_monochrome, /* monochrome bitmap */
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ftc_image_grays = ftc_image_format_bitmap, /* anti-aliased bitmap */
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ftc_image_outline = ftc_image_format_outline /* scaled outline */
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} FTC_Image_Type;
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/*************************************************************************/
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/* */
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/* <Struct> */
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/* FTC_Image_Desc */
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/* */
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/* <Description> */
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/* A simple structure used to describe a given glyph image category. */
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/* */
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/* <Fields> */
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/* size :: An FTC_SizeRec used to describe the glyph's face & */
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/* size. */
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/* */
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/* image_type :: The glyph image's type. */
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/* */
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typedef struct FTC_Image_Desc_
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{
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FTC_FontRec font;
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FT_UInt image_type;
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} FTC_Image_Desc;
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/*************************************************************************/
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/* */
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/* <Type> */
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/* FTC_Image_Cache */
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/* */
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/* <Description> */
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/* A handle to an glyph image cache object. They are designed to */
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/* hold many distinct glyph images, while not exceeding a certain */
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/* memory threshold. */
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/* */
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typedef struct FTC_Image_CacheRec_* FTC_Image_Cache;
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/*************************************************************************/
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/* */
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/* <Function> */
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/* FTC_Image_Cache_New */
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/* */
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/* <Description> */
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/* Creates a new glyph image cache. */
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/* */
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/* <Input> */
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/* manager :: The parent manager for the image cache. */
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/* */
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/* <Output> */
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/* acache :: A handle to the new glyph image cache 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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FT_EXPORT_DEF( FT_Error ) FTC_Image_Cache_New( FTC_Manager manager,
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FTC_Image_Cache* acache );
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/*************************************************************************/
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/* */
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/* <Function> */
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/* FTC_Image_Cache_Lookup */
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/* */
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/* <Description> */
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/* Retrieves a given glyph image from a glyph image cache. */
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/* */
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/* <Input> */
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/* cache :: A handle to the source glyph image cache. */
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/* */
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/* desc :: A pointer to a glyph image descriptor. */
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/* */
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/* gindex :: The glyph index to retrieve. */
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/* */
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/* <Output> */
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/* aglyph :: The corresponding FT_Glyph object. 0 in case of */
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/* failure. */
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/* */
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/* <Return> */
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/* FreType error code. 0 means success. */
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/* */
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/* <Note> */
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/* the returned glyph is owned and manager by the glyph image cache. */
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/* Never try to transform or discard it manually! You can however */
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/* create a copy with FT_Glyph_Copy() and modify the new one. */
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/* */
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/* Because the glyph image cache limits the total amount of memory */
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/* taken by the glyphs it holds, the returned glyph might disappear */
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/* on a later invocation of this function! It's a cache after all... */
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/* */
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FT_EXPORT_DEF( FT_Error ) FTC_Image_Cache_Lookup(
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FTC_Image_Cache cache,
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FTC_Image_Desc* desc,
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FT_UInt gindex,
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FT_Glyph* aglyph );
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#ifdef __cplusplus
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}
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#endif
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#endif /* FTCACHE_H */
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/* END */
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