412 lines
26 KiB
C
412 lines
26 KiB
C
/***************************************************************************/
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/* */
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/* ftcache.h */
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/* */
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/* FreeType Cache subsystem (specification). */
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/* */
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/* Copyright 1996-2001 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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/*************************************************************************/
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/* */
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/* <Section> */
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/* cache_subsystem */
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/* */
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/* <Title> */
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/* Cache Sub-System */
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/* */
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/* <Abstract> */
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/* How to cache face, size, and glyph data with FreeType 2. */
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/* */
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/* <Description> */
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/* This section describes the FreeType 2 cache sub-system which is */
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/* stile in beta. */
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/* */
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/* <Order> */
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/* FTC_Manager */
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/* FTC_FaceID */
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/* FTC_Face_Requester */
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/* */
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/* FTC_Manager_New */
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/* FTC_Manager_Lookup_Face */
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/* FTC_Manager_Lookup_Size */
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/* */
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/* FTC_Node */
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/* FTC_Node_Ref */
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/* FTC_Node_Unref */
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/* */
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/* FTC_Font */
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/* FTC_ImageDesc */
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/* FTC_ImageCache */
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/* FTC_ImageCache_New */
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/* FTC_ImageCache_Lookup */
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/* */
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/* FTC_SBit */
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/* FTC_SBitCache */
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/* FTC_SBitCache_New */
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/* FTC_SBitCache_Lookup */
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/* */
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/* */
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/* FTC_Image_Desc */
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/* FTC_Image_Cache */
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/* FTC_Image_Cache_Lookup */
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/* */
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/* FTC_SBit_Cache */
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/* FTC_SBit_Cache_Lookup */
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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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/***** 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
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(*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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#define FTC_FONT_COMPARE( f1, f2 ) \
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( (f1)->face_id == (f2)->face_id && \
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(f1)->pix_width == (f2)->pix_width && \
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(f1)->pix_height == (f2)->pix_height )
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#define FTC_FACE_ID_HASH( i ) ((FT_UInt32)(FT_Pointer)( i ))
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#define FTC_FONT_HASH( f ) \
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(FT_UInt32)( FTC_FACE_ID_HASH((f)->face_id) ^ \
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((f)->pix_width << 8) ^ \
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((f)->pix_height) )
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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 an @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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/* <Type> */
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/* FTC_Node */
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/* */
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/* <Description> */
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/* An opaque handle to a cache node object. Each cache node is */
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/* reference-counted. A node with a count of 0 might be flushed */
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/* out of a full cache whenever a lookup request is performed. */
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/* */
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/* If you lookup nodes, you have the ability to "acquire" them, i.e., */
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/* to increment their reference count. This will prevent the node */
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/* from being flushed out of the cache until you explicitly "release" */
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/* it (see @FTC_Node_Release). */
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/* */
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/* See also @FTC_BitsetCache_Lookup and @FTC_ImageCache_Lookup. */
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/* */
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typedef struct FTC_NodeRec_* FTC_Node;
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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 )
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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 and @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 )
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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 )
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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 )
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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 and @FT_Size objects that correspond to a */
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/* given @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 )
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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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FT_END_HEADER
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#endif /* __FTCACHE_H__ */
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/* END */
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