ref: bce2986d0d884886ae76e024b55199996cf6b52c
dir: /include/freetype/ftcache.h/
/***************************************************************************/
/* */
/* ftcache.h */
/* */
/* FreeType Cache subsystem. */
/* */
/* Copyright 1996-2001 by */
/* David Turner, Robert Wilhelm, and Werner Lemberg. */
/* */
/* This file is part of the FreeType project, and may only be used, */
/* modified, and distributed under the terms of the FreeType project */
/* license, LICENSE.TXT. By continuing to use, modify, or distribute */
/* this file you indicate that you have read the license and */
/* understand and accept it fully. */
/* */
/***************************************************************************/
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/********* *********/
/********* WARNING, THIS IS BETA CODE. *********/
/********* *********/
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
#ifndef __FTCACHE_H__
#define __FTCACHE_H__
#include <ft2build.h>
#include FT_GLYPH_H
FT_BEGIN_HEADER
/*************************************************************************/
/* */
/* <Section> */
/* cache_subsystem */
/* */
/* <Title> */
/* Cache Sub-System */
/* */
/* <Abstract> */
/* How to cache face, size, and glyph data with FreeType 2. */
/* */
/* <Description> */
/* This section describes the FreeType 2 cache sub-system which is */
/* stile in beta. */
/* */
/* <Order> */
/* FTC_Manager */
/* FTC_FaceID */
/* FTC_Face_Requester */
/* */
/* FTC_Manager_New */
/* FTC_Manager_Lookup_Face */
/* FTC_Manager_Lookup_Size */
/* */
/* FTC_Node */
/* FTC_Node_Unref */
/* */
/* FTC_Font */
/* FTC_ImageDesc */
/* FTC_ImageCache */
/* FTC_ImageCache_New */
/* FTC_ImageCache_Lookup */
/* */
/* FTC_SBit */
/* FTC_SBitCache */
/* FTC_SBitCache_New */
/* FTC_SBitCache_Lookup */
/* */
/* */
/* FTC_Image_Desc */
/* FTC_Image_Cache */
/* FTC_Image_Cache_Lookup */
/* */
/* FTC_SBit_Cache */
/* FTC_Sbit_Cache_Lookup */
/* */
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/***** *****/
/***** BASIC TYPE DEFINITIONS *****/
/***** *****/
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/* */
/* <Type> */
/* FTC_FaceID */
/* */
/* <Description> */
/* A generic pointer type that is used to identity face objects. The */
/* contents of such objects is application-dependent. */
/* */
typedef FT_Pointer FTC_FaceID;
/*************************************************************************/
/* */
/* <FuncType> */
/* FTC_Face_Requester */
/* */
/* <Description> */
/* A callback function provided by client applications. It is used */
/* to translate a given FTC_FaceID into a new valid FT_Face object. */
/* */
/* <Input> */
/* face_id :: The face ID to resolve. */
/* */
/* library :: A handle to a FreeType library object. */
/* */
/* data :: Application-provided request data. */
/* */
/* <Output> */
/* aface :: A new FT_Face handle. */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
/* <Note> */
/* The face requester should not perform funny things on the returned */
/* face object, like creating a new FT_Size for it, or setting a */
/* transformation through FT_Set_Transform()! */
/* */
typedef FT_Error
(*FTC_Face_Requester)( FTC_FaceID face_id,
FT_Library library,
FT_Pointer request_data,
FT_Face* aface );
/*************************************************************************/
/* */
/* <Struct> */
/* FTC_FontRec */
/* */
/* <Description> */
/* A simple structure used to describe a given `font' to the cache */
/* manager. Note that a `font' is the combination of a given face */
/* with a given character size. */
/* */
/* <Fields> */
/* face_id :: The ID of the face to use. */
/* */
/* pix_width :: The character width in integer pixels. */
/* */
/* pix_height :: The character height in integer pixels. */
/* */
typedef struct FTC_FontRec_
{
FTC_FaceID face_id;
FT_UShort pix_width;
FT_UShort pix_height;
} FTC_FontRec;
/* */
#define FTC_FONT_COMPARE( f1, f2 ) \
( (f1)->face_id == (f2)->face_id && \
(f1)->pix_width == (f2)->pix_width && \
(f1)->pix_height == (f2)->pix_height )
#define FTC_FACE_ID_HASH( i ) ((FT_UInt32)(FT_Pointer)( i ))
#define FTC_FONT_HASH( f ) \
(FT_UInt32)( FTC_FACE_ID_HASH((f)->face_id) ^ \
((f)->pix_width << 8) ^ \
((f)->pix_height) )
/*************************************************************************/
/* */
/* <Type> */
/* FTC_Font */
/* */
/* <Description> */
/* A simple handle to a FTC_FontRec structure. */
/* */
typedef FTC_FontRec* FTC_Font;
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/***** *****/
/***** CACHE MANAGER OBJECT *****/
/***** *****/
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/* */
/* <Type> */
/* FTC_Manager */
/* */
/* <Description> */
/* This object is used to cache one or more FT_Face objects, along */
/* with corresponding FT_Size objects. */
/* */
typedef struct FTC_ManagerRec_* FTC_Manager;
/*************************************************************************/
/* */
/* <Type> */
/* FTC_Node */
/* */
/* <Description> */
/* an opaque handle to a cache node object. Each cache node is */
/* reference-counted. A node with a count of 0 might be flushed */
/* out of a full cache whenever a lookup request is performed */
/* */
/* when you lookup nodes, you have the ability to "acquire" them, */
/* i.e. increment their reference count. This will prevent the node */
/* from being flushed out of the cache until you explicitely */
/* "release" it (see @FTC_Node_Release) */
/* */
/* see @FTC_BitsetCache_Lookup and @FTC_ImageCache_Lookup */
/* */
typedef struct FTC_NodeRec_* FTC_Node;
/*************************************************************************/
/* */
/* <Function> */
/* FTC_Manager_New */
/* */
/* <Description> */
/* Creates a new cache manager. */
/* */
/* <Input> */
/* library :: The parent FreeType library handle to use. */
/* */
/* max_faces :: Maximum number of faces to keep alive in manager. */
/* Use 0 for defaults. */
/* */
/* max_sizes :: Maximum number of sizes to keep alive in manager. */
/* Use 0 for defaults. */
/* */
/* max_bytes :: Maximum number of bytes to use for cached data. */
/* Use 0 for defaults. */
/* */
/* requester :: An application-provided callback used to translate */
/* face IDs into real FT_Face objects. */
/* */
/* req_data :: A generic pointer that is passed to the requester */
/* each time it is called (see FTC_Face_Requester) */
/* */
/* <Output> */
/* amanager :: A handle to a new manager object. 0 in case of */
/* failure. */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
FT_EXPORT( FT_Error )
FTC_Manager_New( FT_Library library,
FT_UInt max_faces,
FT_UInt max_sizes,
FT_ULong max_bytes,
FTC_Face_Requester requester,
FT_Pointer req_data,
FTC_Manager *amanager );
/*************************************************************************/
/* */
/* <Function> */
/* FTC_Manager_Reset */
/* */
/* <Description> */
/* Empties a given cache manager. This simply gets rid of all the */
/* currently cached FT_Face & FT_Size objects within the manager. */
/* */
/* <InOut> */
/* manager :: A handle to the manager. */
/* */
FT_EXPORT( void )
FTC_Manager_Reset( FTC_Manager manager );
/*************************************************************************/
/* */
/* <Function> */
/* FTC_Manager_Done */
/* */
/* <Description> */
/* Destroys a given manager after emptying it. */
/* */
/* <Input> */
/* manager :: A handle to the target cache manager object. */
/* */
FT_EXPORT( void )
FTC_Manager_Done( FTC_Manager manager );
/*************************************************************************/
/* */
/* <Function> */
/* FTC_Manager_Lookup_Face */
/* */
/* <Description> */
/* Retrieves the FT_Face object that corresponds to a given face ID */
/* through a cache manager. */
/* */
/* <Input> */
/* manager :: A handle to the cache manager. */
/* */
/* face_id :: The ID of the face object. */
/* */
/* <Output> */
/* aface :: A handle to the face object. */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
/* <Note> */
/* The returned FT_Face object is always owned by the manager. You */
/* should never try to discard it yourself. */
/* */
/* The FT_Face object doesn't necessarily have a current size object */
/* (i.e., face->size can be 0). If you need a specific `font size', */
/* use FTC_Manager_Lookup_Size() instead. */
/* */
/* Never change the face's transformation matrix (i.e., never call */
/* the FT_Set_Transform() function) on a returned face! If you need */
/* to transform glyphs, do it yourself after glyph loading. */
/* */
FT_EXPORT( FT_Error )
FTC_Manager_Lookup_Face( FTC_Manager manager,
FTC_FaceID face_id,
FT_Face *aface );
/*************************************************************************/
/* */
/* <Function> */
/* FTC_Manager_Lookup_Size */
/* */
/* <Description> */
/* Retrieves the FT_Face & FT_Size objects that correspond to a given */
/* FTC_SizeID. */
/* */
/* <Input> */
/* manager :: A handle to the cache manager. */
/* */
/* size_id :: The ID of the `font size' to use. */
/* */
/* <Output> */
/* aface :: A pointer to the handle of the face object. Set it to */
/* zero if you don't need it. */
/* */
/* asize :: A pointer to the handle of the size object. Set it to */
/* zero if you don't need it. */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
/* <Note> */
/* The returned FT_Face object is always owned by the manager. You */
/* should never try to discard it yourself. */
/* */
/* Never change the face's transformation matrix (i.e., never call */
/* the FT_Set_Transform() function) on a returned face! If you need */
/* to transform glyphs, do it yourself after glyph loading. */
/* */
/* Similarly, the returned FT_Size object is always owned by the */
/* manager. You should never try to discard it, and never change its */
/* settings with FT_Set_Pixel_Sizes() or FT_Set_Char_Size()! */
/* */
/* The returned size object is the face's current size, which means */
/* that you can call FT_Load_Glyph() with the face if you need to. */
/* */
FT_EXPORT( FT_Error )
FTC_Manager_Lookup_Size( FTC_Manager manager,
FTC_Font font,
FT_Face *aface,
FT_Size *asize );
/*************************************************************************/
/* */
/* <Function> */
/* FTC_Node_Unref */
/* */
/* <Description> */
/* decrement a cache node's internal reference count. when the count */
/* reaches 0, it is not destroyed but becomes eligible for subsequent */
/* cache flushes.. */
/* */
/* <Input> */
/* node :: cache node handle */
/* manager :: cache manager handle */
/* */
FT_EXPORT( void )
FTC_Node_Unref( FTC_Node node,
FTC_Manager manager );
/* */
FT_END_HEADER
#endif /* __FTCACHE_H__ */
/* END */