341 lines
21 KiB
C
341 lines
21 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 BETA CODE. *********/
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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 <ft2build.h>
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#include FT_GLYPH_H
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FT_BEGIN_HEADER
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#define FT_CACHE_MANAGER_H FT2_PUBLIC_FILE(cache/ftcmanag.h)
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#define FT_CACHE_IMAGE_H FT2_PUBLIC_FILE(cache/ftcimage.h)
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#define FT_CACHE_SMALL_BITMAPS_H FT2_PUBLIC_FILE(cache/ftcsbits.h)
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#define FT_CACHE_INTERNAL_LRU_H FT2_PUBLIC_FILE(cache/ftlru.h)
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#define FT_CACHE_INTERNAL_GLYPH_H FT2_PUBLIC_FILE(cache/ftcglyph.h)
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#define FT_CACHE_INTERNAL_CHUNK_H FT2_PUBLIC_FILE(cache/ftcchunk.h)
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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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/* <Note> */
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/* The face requester should not perform funny things on the returned */
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/* face object, like creating a new FT_Size for it, or setting a */
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/* transformation through FT_Set_Transform()! */
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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( 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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/* <InOut> */
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/* manager :: A handle to the manager. */
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/* */
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FT_EXPORT( 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( 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( 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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/* <Output> */
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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( 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( 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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FT_END_HEADER
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#endif /* __FTCACHE_H__ */
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/* END */
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