ref: 80b96f350c8ea73f7da0dd76fc5c075dcbfdfaa9
dir: /include/freetype/ftcache.h/
/***************************************************************************/
/* */
/* ftcache.h */
/* */
/* FreeType Cache subsystem. */
/* */
/* Copyright 1996-2000 by */
/* David Turner, Robert Wilhelm, and Werner Lemberg. */
/* */
/* This file is part of the FreeType project, and may only be used, */
/* modified, and distributed under the terms of the FreeType project */
/* license, LICENSE.TXT. By continuing to use, modify, or distribute */
/* this file you indicate that you have read the license and */
/* understand and accept it fully. */
/* */
/***************************************************************************/
#ifndef FTCACHE_H
#define FTCACHE_H
#include <freetype/ftglyph.h>
#ifdef __cplusplus
extern "C" {
#endif
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/***** *****/
/***** 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. */
/* */
typedef FT_Error (*FTC_Face_Requester)( FTC_FaceID face_id,
FT_Library library,
FT_Pointer request_data,
FT_Face* aface );
/*************************************************************************/
/* */
/* <Struct> */
/* FTC_SizeRec */
/* */
/* <Description> */
/* A simple structure used to describe a given `font size' to the */
/* cache manager. */
/* */
/* <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_SizeRec_
{
FTC_FaceID face_id;
FT_UShort pix_width;
FT_UShort pix_height;
} FTC_SizeRec;
/*************************************************************************/
/* */
/* <Type> */
/* FTC_SizeID */
/* */
/* <Description> */
/* A simple handle to a FTC_SizeRec structure. */
/* */
typedef FTC_SizeRec* FTC_SizeID;
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/***** *****/
/***** 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;
/*************************************************************************/
/* */
/* <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. */
/* */
/* 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_DEF( FT_Error ) FTC_Manager_New( FT_Library library,
FT_UInt max_faces,
FT_UInt max_sizes,
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. */
/* */
/* <Input> */
/* manager :: A handle to the manager. */
/* */
FT_EXPORT_DEF( 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_DEF( 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_DEF( 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. */
/* */
/* <InOut> */
/* 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_DEF( FT_Error ) FTC_Manager_Lookup_Size( FTC_Manager manager,
FTC_SizeID size_id,
FT_Face* aface,
FT_Size* asize );
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/***** *****/
/***** IMAGE CACHE OBJECT *****/
/***** *****/
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/* */
/* <Enum> */
/* FTC_Image_Type */
/* */
/* <Description> */
/* An enumeration used to list the types of glyph images found in a */
/* glyph image cache. */
/* */
/* <Fields> */
/* ftc_image_mono :: Monochrome bitmap glyphs. */
/* */
/* ftc_image_grays :: Anti-aliased bitmap glyphs. */
/* */
/* ftc_image_outline :: Scaled (and hinted) outline glyphs. */
/* */
/* ftc_master_outline :: Unscaled original outline glyphs. */
/* */
/* <Note> */
/* Other types may be defined in the future. */
/* */
#define FTC_IMAGE_FORMAT(x) ((x) & 7)
typedef enum FTC_Image_Type_
{
ftc_image_format_bitmap = 0,
ftc_image_format_outline = 1,
ftc_image_flag_monochrome = 16,
ftc_image_flag_unhinted = 32,
ftc_image_flag_autohinted = 64,
ftc_image_flag_unscaled = 128,
ftc_image_flag_no_sbits = 256,
ftc_image_mono = ftc_image_format_bitmap |
ftc_image_flag_monochrome, /* monochrome bitmap */
ftc_image_grays = ftc_image_format_bitmap, /* anti-aliased bitmap */
ftc_image_outline = ftc_image_format_outline /* scaled outline */
} FTC_Image_Type;
/*************************************************************************/
/* */
/* <Struct> */
/* FTC_Image_Desc */
/* */
/* <Description> */
/* A simple structure used to describe a given glyph image category. */
/* */
/* <Fields> */
/* size :: An FTC_SizeRec used to describe the glyph's face & */
/* size. */
/* */
/* image_type :: The glyph image's type. */
/* */
typedef struct FTC_Image_Desc_
{
FTC_SizeRec size;
FT_UInt image_type;
} FTC_Image_Desc;
/*************************************************************************/
/* */
/* <Type> */
/* FTC_Image_Cache */
/* */
/* <Description> */
/* A handle to an glyph image cache object. They are designed to */
/* hold many distinct glyph images, while not exceeding a certain */
/* memory threshold. */
/* */
typedef struct FTC_Image_CacheRec_* FTC_Image_Cache;
/*************************************************************************/
/* */
/* <Function> */
/* FTC_Image_Cache_New */
/* */
/* <Description> */
/* Creates a new glyph image cache. */
/* */
/* <Input> */
/* manager :: The parent manager for the image cache. */
/* */
/* max_bytes :: The maximum amount of memory that will be used to */
/* store glyph images. */
/* */
/* <Output> */
/* acache :: A handle to the new glyph image cache object. */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
FT_EXPORT_DEF( FT_Error ) FTC_Image_Cache_New( FTC_Manager manager,
FT_ULong max_bytes,
FTC_Image_Cache* acache );
/*************************************************************************/
/* */
/* <Function> */
/* FTC_Image_Cache_Done */
/* */
/* <Description> */
/* Destroys a given glyph image cache (and all glyphs within it). */
/* */
/* <Input> */
/* manager :: The parent manager for the image cache. */
/* */
FT_EXPORT_DEF( void ) FTC_Image_Cache_Done( FTC_Image_Cache cache );
/*************************************************************************/
/* */
/* <Function> */
/* FTC_Image_Cache_Lookup */
/* */
/* <Description> */
/* Retrieves a given glyph image from a glyph image cache. */
/* */
/* <Input> */
/* cache :: A handle to the source glyph image cache. */
/* */
/* desc :: A pointer to a glyph image descriptor. */
/* */
/* gindex :: The glyph index to retrieve. */
/* */
/* <Output> */
/* aglyph :: The corresponding FT_Glyph object. 0 in case of */
/* failure. */
/* */
/* <Return> */
/* FreType error code. 0 means success. */
/* */
/* <Note> */
/* the returned glyph is owned and manager by the glyph image cache. */
/* Never try to transform or discard it manually! You can however */
/* create a copy with FT_Glyph_Copy() and modify the new one. */
/* */
/* Because the glyph image cache limits the total amount of memory */
/* taken by the glyphs it holds, the returned glyph might disappear */
/* on a later invocation of this function! It's a cache after all ;-) */
/* */
FT_EXPORT_DEF( FT_Error ) FTC_Image_Cache_Lookup(
FTC_Image_Cache cache,
FTC_Image_Desc* desc,
FT_UInt gindex,
FT_Glyph* aglyph );
#ifdef __cplusplus
}
#endif
#endif /* FTCACHE_H */
/* END */