CS代考计算机代写 cache scheme /***************************************************************************/

程序代写 CS代考 / Scheme代写代考

/***************************************************************************/
/* */
/* ftcache.h */
/* */
/* FreeType Cache subsystem (specification). */
/* */
/* Copyright 1996-2015 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
#include FT_GLYPH_H

FT_BEGIN_HEADER

/*************************************************************************
*
*


* cache_subsystem
*
* <br /> * Cache Sub-System<br /> *<br /> * <Abstract><br /> * How to cache face, size, and glyph data with FreeType~2.<br /> *<br /> * <Description><br /> * This section describes the FreeType~2 cache sub-system, which is used<br /> * to limit the number of concurrently opened @FT_Face and @FT_Size<br /> * objects, as well as caching information like character maps and glyph<br /> * images while limiting their maximum memory usage.<br /> *<br /> * Note that all types and functions begin with the `FTC_’ prefix.<br /> *<br /> * The cache is highly portable and thus doesn’t know anything about the<br /> * fonts installed on your system, or how to access them. This implies<br /> * the following scheme:<br /> *<br /> * First, available or installed font faces are uniquely identified by<br /> * @FTC_FaceID values, provided to the cache by the client. Note that<br /> * the cache only stores and compares these values, and doesn’t try to<br /> * interpret them in any way.<br /> *<br /> * Second, the cache calls, only when needed, a client-provided function<br /> * to convert an @FTC_FaceID into a new @FT_Face object. The latter is<br /> * then completely managed by the cache, including its termination<br /> * through @FT_Done_Face. To monitor termination of face objects, the<br /> * finalizer callback in the `generic’ field of the @FT_Face object can<br /> * be used, which might also be used to store the @FTC_FaceID of the<br /> * face.<br /> *<br /> * Clients are free to map face IDs to anything else. The most simple<br /> * usage is to associate them to a (pathname,face_index) pair that is<br /> * used to call @FT_New_Face. However, more complex schemes are also<br /> * possible.<br /> *<br /> * Note that for the cache to work correctly, the face ID values must be<br /> * *persistent*, which means that the contents they point to should not<br /> * change at runtime, or that their value should not become invalid.<br /> *<br /> * If this is unavoidable (e.g., when a font is uninstalled at runtime),<br /> * you should call @FTC_Manager_RemoveFaceID as soon as possible, to let<br /> * the cache get rid of any references to the old @FTC_FaceID it may<br /> * keep internally. Failure to do so will lead to incorrect behaviour<br /> * or even crashes.<br /> *<br /> * To use the cache, start with calling @FTC_Manager_New to create a new<br /> * @FTC_Manager object, which models a single cache instance. You can<br /> * then look up @FT_Face and @FT_Size objects with<br /> * @FTC_Manager_LookupFace and @FTC_Manager_LookupSize, respectively.<br /> *<br /> * If you want to use the charmap caching, call @FTC_CMapCache_New, then<br /> * later use @FTC_CMapCache_Lookup to perform the equivalent of<br /> * @FT_Get_Char_Index, only much faster.<br /> *<br /> * If you want to use the @FT_Glyph caching, call @FTC_ImageCache, then<br /> * later use @FTC_ImageCache_Lookup to retrieve the corresponding<br /> * @FT_Glyph objects from the cache.<br /> *<br /> * If you need lots of small bitmaps, it is much more memory efficient<br /> * to call @FTC_SBitCache_New followed by @FTC_SBitCache_Lookup. This<br /> * returns @FTC_SBitRec structures, which are used to store small<br /> * bitmaps directly. (A small bitmap is one whose metrics and<br /> * dimensions all fit into 8-bit integers).<br /> *<br /> * We hope to also provide a kerning cache in the near future.<br /> *<br /> *<br /> * <Order><br /> * FTC_Manager<br /> * FTC_FaceID<br /> * FTC_Face_Requester<br /> *<br /> * FTC_Manager_New<br /> * FTC_Manager_Reset<br /> * FTC_Manager_Done<br /> * FTC_Manager_LookupFace<br /> * FTC_Manager_LookupSize<br /> * FTC_Manager_RemoveFaceID<br /> *<br /> * FTC_Node<br /> * FTC_Node_Unref<br /> *<br /> * FTC_ImageCache<br /> * FTC_ImageCache_New<br /> * FTC_ImageCache_Lookup<br /> *<br /> * FTC_SBit<br /> * FTC_SBitCache<br /> * FTC_SBitCache_New<br /> * FTC_SBitCache_Lookup<br /> *<br /> * FTC_CMapCache<br /> * FTC_CMapCache_New<br /> * FTC_CMapCache_Lookup<br /> *<br /> *************************************************************************/</p> <p> /*************************************************************************/<br /> /*************************************************************************/<br /> /*************************************************************************/<br /> /***** *****/<br /> /***** BASIC TYPE DEFINITIONS *****/<br /> /***** *****/<br /> /*************************************************************************/<br /> /*************************************************************************/<br /> /*************************************************************************/</p> <p> /*************************************************************************<br /> *<br /> * @type: FTC_FaceID<br /> *<br /> * @description:<br /> * An opaque pointer type that is used to identity face objects. The<br /> * contents of such objects is application-dependent.<br /> *<br /> * These pointers are typically used to point to a user-defined<br /> * structure containing a font file path, and face index.<br /> *<br /> * @note:<br /> * Never use NULL as a valid @FTC_FaceID.<br /> *<br /> * Face IDs are passed by the client to the cache manager that calls,<br /> * when needed, the @FTC_Face_Requester to translate them into new<br /> * @FT_Face objects.<br /> *<br /> * If the content of a given face ID changes at runtime, or if the value<br /> * becomes invalid (e.g., when uninstalling a font), you should<br /> * immediately call @FTC_Manager_RemoveFaceID before any other cache<br /> * function.<br /> *<br /> * Failure to do so will result in incorrect behaviour or even<br /> * memory leaks and crashes.<br /> */<br /> typedef FT_Pointer FTC_FaceID;</p> <p> /************************************************************************<br /> *<br /> * @functype:<br /> * FTC_Face_Requester<br /> *<br /> * @description:<br /> * A callback function provided by client applications. It is used by<br /> * the cache manager to translate a given @FTC_FaceID into a new valid<br /> * @FT_Face object, on demand.<br /> *<br /> * <Input><br /> * face_id ::<br /> * The face ID to resolve.<br /> *<br /> * library ::<br /> * A handle to a FreeType library object.<br /> *<br /> * req_data ::<br /> * Application-provided request data (see note below).<br /> *<br /> * <Output><br /> * aface ::<br /> * A new @FT_Face handle.<br /> *<br /> * <Return><br /> * FreeType error code. 0~means success.<br /> *<br /> * <Note><br /> * The third parameter `req_data’ is the same as the one passed by the<br /> * client when @FTC_Manager_New is called.<br /> *<br /> * The face requester should not perform funny things on the returned<br /> * face object, like creating a new @FT_Size for it, or setting a<br /> * transformation through @FT_Set_Transform!<br /> */<br /> typedef FT_Error<br /> (*FTC_Face_Requester)( FTC_FaceID face_id,<br /> FT_Library library,<br /> FT_Pointer req_data,<br /> FT_Face* aface );</p> <p> /* */</p> <p> /*************************************************************************/<br /> /*************************************************************************/<br /> /*************************************************************************/<br /> /***** *****/<br /> /***** CACHE MANAGER OBJECT *****/<br /> /***** *****/<br /> /*************************************************************************/<br /> /*************************************************************************/<br /> /*************************************************************************/</p> <p> /*************************************************************************/<br /> /* */<br /> /* <Type> */<br /> /* FTC_Manager */<br /> /* */<br /> /* <Description> */<br /> /* This object corresponds to one instance of the cache-subsystem. */<br /> /* It is used to cache one or more @FT_Face objects, along with */<br /> /* corresponding @FT_Size objects. */<br /> /* */<br /> /* The manager intentionally limits the total number of opened */<br /> /* @FT_Face and @FT_Size objects to control memory usage. See the */<br /> /* `max_faces’ and `max_sizes’ parameters of @FTC_Manager_New. */<br /> /* */<br /> /* The manager is also used to cache `nodes’ of various types while */<br /> /* limiting their total memory usage. */<br /> /* */<br /> /* All limitations are enforced by keeping lists of managed objects */<br /> /* in most-recently-used order, and flushing old nodes to make room */<br /> /* for new ones. */<br /> /* */<br /> typedef struct FTC_ManagerRec_* FTC_Manager;</p> <p> /*************************************************************************/<br /> /* */<br /> /* <Type> */<br /> /* FTC_Node */<br /> /* */<br /> /* <Description> */<br /> /* An opaque handle to a cache node object. Each cache node is */<br /> /* reference-counted. A node with a count of~0 might be flushed */<br /> /* out of a full cache whenever a lookup request is performed. */<br /> /* */<br /> /* If you look up nodes, you have the ability to `acquire’ them, */<br /> /* i.e., to increment their reference count. This will prevent the */<br /> /* node from being flushed out of the cache until you explicitly */<br /> /* `release’ it (see @FTC_Node_Unref). */<br /> /* */<br /> /* See also @FTC_SBitCache_Lookup and @FTC_ImageCache_Lookup. */<br /> /* */<br /> typedef struct FTC_NodeRec_* FTC_Node;</p> <p> /*************************************************************************/<br /> /* */<br /> /* <Function> */<br /> /* FTC_Manager_New */<br /> /* */<br /> /* <Description> */<br /> /* Create a new cache manager. */<br /> /* */<br /> /* <Input> */<br /> /* library :: The parent FreeType library handle to use. */<br /> /* */<br /> /* max_faces :: Maximum number of opened @FT_Face objects managed by */<br /> /* this cache instance. Use~0 for defaults. */<br /> /* */<br /> /* max_sizes :: Maximum number of opened @FT_Size objects managed by */<br /> /* this cache instance. Use~0 for defaults. */<br /> /* */<br /> /* max_bytes :: Maximum number of bytes to use for cached data nodes. */<br /> /* Use~0 for defaults. Note that this value does not */<br /> /* account for managed @FT_Face and @FT_Size objects. */<br /> /* */<br /> /* requester :: An application-provided callback used to translate */<br /> /* face IDs into real @FT_Face objects. */<br /> /* */<br /> /* req_data :: A generic pointer that is passed to the requester */<br /> /* each time it is called (see @FTC_Face_Requester). */<br /> /* */<br /> /* <Output> */<br /> /* amanager :: A handle to a new manager object. 0~in case of */<br /> /* failure. */<br /> /* */<br /> /* <Return> */<br /> /* FreeType error code. 0~means success. */<br /> /* */<br /> FT_EXPORT( FT_Error )<br /> FTC_Manager_New( FT_Library library,<br /> FT_UInt max_faces,<br /> FT_UInt max_sizes,<br /> FT_ULong max_bytes,<br /> FTC_Face_Requester requester,<br /> FT_Pointer req_data,<br /> FTC_Manager *amanager );</p> <p> /*************************************************************************/<br /> /* */<br /> /* <Function> */<br /> /* FTC_Manager_Reset */<br /> /* */<br /> /* <Description> */<br /> /* Empty a given cache manager. This simply gets rid of all the */<br /> /* currently cached @FT_Face and @FT_Size objects within the manager. */<br /> /* */<br /> /* <InOut> */<br /> /* manager :: A handle to the manager. */<br /> /* */<br /> FT_EXPORT( void )<br /> FTC_Manager_Reset( FTC_Manager manager );</p> <p> /*************************************************************************/<br /> /* */<br /> /* <Function> */<br /> /* FTC_Manager_Done */<br /> /* */<br /> /* <Description> */<br /> /* Destroy a given manager after emptying it. */<br /> /* */<br /> /* <Input> */<br /> /* manager :: A handle to the target cache manager object. */<br /> /* */<br /> FT_EXPORT( void )<br /> FTC_Manager_Done( FTC_Manager manager );</p> <p> /*************************************************************************/<br /> /* */<br /> /* <Function> */<br /> /* FTC_Manager_LookupFace */<br /> /* */<br /> /* <Description> */<br /> /* Retrieve the @FT_Face object that corresponds to a given face ID */<br /> /* through a cache manager. */<br /> /* */<br /> /* <Input> */<br /> /* manager :: A handle to the cache manager. */<br /> /* */<br /> /* face_id :: The ID of the face object. */<br /> /* */<br /> /* <Output> */<br /> /* aface :: A handle to the face object. */<br /> /* */<br /> /* <Return> */<br /> /* FreeType error code. 0~means success. */<br /> /* */<br /> /* <Note> */<br /> /* The returned @FT_Face object is always owned by the manager. You */<br /> /* should never try to discard it yourself. */<br /> /* */<br /> /* The @FT_Face object doesn’t necessarily have a current size object */<br /> /* (i.e., face->size can be~0). If you need a specific `font size’, */<br /> /* use @FTC_Manager_LookupSize instead. */<br /> /* */<br /> /* Never change the face’s transformation matrix (i.e., never call */<br /> /* the @FT_Set_Transform function) on a returned face! If you need */<br /> /* to transform glyphs, do it yourself after glyph loading. */<br /> /* */<br /> /* When you perform a lookup, out-of-memory errors are detected */<br /> /* _within_ the lookup and force incremental flushes of the cache */<br /> /* until enough memory is released for the lookup to succeed. */<br /> /* */<br /> /* If a lookup fails with `FT_Err_Out_Of_Memory’ the cache has */<br /> /* already been completely flushed, and still no memory was available */<br /> /* for the operation. */<br /> /* */<br /> FT_EXPORT( FT_Error )<br /> FTC_Manager_LookupFace( FTC_Manager manager,<br /> FTC_FaceID face_id,<br /> FT_Face *aface );</p> <p> /*************************************************************************/<br /> /* */<br /> /* <Struct> */<br /> /* FTC_ScalerRec */<br /> /* */<br /> /* <Description> */<br /> /* A structure used to describe a given character size in either */<br /> /* pixels or points to the cache manager. See */<br /> /* @FTC_Manager_LookupSize. */<br /> /* */<br /> /* <Fields> */<br /> /* face_id :: The source face ID. */<br /> /* */<br /> /* width :: The character width. */<br /> /* */<br /> /* height :: The character height. */<br /> /* */<br /> /* pixel :: A Boolean. If 1, the `width’ and `height’ fields are */<br /> /* interpreted as integer pixel character sizes. */<br /> /* Otherwise, they are expressed as 1/64th of points. */<br /> /* */<br /> /* x_res :: Only used when `pixel’ is value~0 to indicate the */<br /> /* horizontal resolution in dpi. */<br /> /* */<br /> /* y_res :: Only used when `pixel’ is value~0 to indicate the */<br /> /* vertical resolution in dpi. */<br /> /* */<br /> /* <Note> */<br /> /* This type is mainly used to retrieve @FT_Size objects through the */<br /> /* cache manager. */<br /> /* */<br /> typedef struct FTC_ScalerRec_<br /> {<br /> FTC_FaceID face_id;<br /> FT_UInt width;<br /> FT_UInt height;<br /> FT_Int pixel;<br /> FT_UInt x_res;<br /> FT_UInt y_res;</p> <p> } FTC_ScalerRec;</p> <p> /*************************************************************************/<br /> /* */<br /> /* <Struct> */<br /> /* FTC_Scaler */<br /> /* */<br /> /* <Description> */<br /> /* A handle to an @FTC_ScalerRec structure. */<br /> /* */<br /> typedef struct FTC_ScalerRec_* FTC_Scaler;</p> <p> /*************************************************************************/<br /> /* */<br /> /* <Function> */<br /> /* FTC_Manager_LookupSize */<br /> /* */<br /> /* <Description> */<br /> /* Retrieve the @FT_Size object that corresponds to a given */<br /> /* @FTC_ScalerRec pointer through a cache manager. */<br /> /* */<br /> /* <Input> */<br /> /* manager :: A handle to the cache manager. */<br /> /* */<br /> /* scaler :: A scaler handle. */<br /> /* */<br /> /* <Output> */<br /> /* asize :: A handle to the size object. */<br /> /* */<br /> /* <Return> */<br /> /* FreeType error code. 0~means success. */<br /> /* */<br /> /* <Note> */<br /> /* The returned @FT_Size object is always owned by the manager. You */<br /> /* should never try to discard it by yourself. */<br /> /* */<br /> /* You can access the parent @FT_Face object simply as `size->face’ */<br /> /* if you need it. Note that this object is also owned by the */<br /> /* manager. */<br /> /* */<br /> /* <Note> */<br /> /* When you perform a lookup, out-of-memory errors are detected */<br /> /* _within_ the lookup and force incremental flushes of the cache */<br /> /* until enough memory is released for the lookup to succeed. */<br /> /* */<br /> /* If a lookup fails with `FT_Err_Out_Of_Memory’ the cache has */<br /> /* already been completely flushed, and still no memory is available */<br /> /* for the operation. */<br /> /* */<br /> FT_EXPORT( FT_Error )<br /> FTC_Manager_LookupSize( FTC_Manager manager,<br /> FTC_Scaler scaler,<br /> FT_Size *asize );</p> <p> /*************************************************************************/<br /> /* */<br /> /* <Function> */<br /> /* FTC_Node_Unref */<br /> /* */<br /> /* <Description> */<br /> /* Decrement a cache node’s internal reference count. When the count */<br /> /* reaches 0, it is not destroyed but becomes eligible for subsequent */<br /> /* cache flushes. */<br /> /* */<br /> /* <Input> */<br /> /* node :: The cache node handle. */<br /> /* */<br /> /* manager :: The cache manager handle. */<br /> /* */<br /> FT_EXPORT( void )<br /> FTC_Node_Unref( FTC_Node node,<br /> FTC_Manager manager );</p> <p> /*************************************************************************<br /> *<br /> * @function:<br /> * FTC_Manager_RemoveFaceID<br /> *<br /> * @description:<br /> * A special function used to indicate to the cache manager that<br /> * a given @FTC_FaceID is no longer valid, either because its<br /> * content changed, or because it was deallocated or uninstalled.<br /> *<br /> * @input:<br /> * manager ::<br /> * The cache manager handle.<br /> *<br /> * face_id ::<br /> * The @FTC_FaceID to be removed.<br /> *<br /> * @note:<br /> * This function flushes all nodes from the cache corresponding to this<br /> * `face_id’, with the exception of nodes with a non-null reference<br /> * count.<br /> *<br /> * Such nodes are however modified internally so as to never appear<br /> * in later lookups with the same `face_id’ value, and to be immediately<br /> * destroyed when released by all their users.<br /> *<br /> */<br /> FT_EXPORT( void )<br /> FTC_Manager_RemoveFaceID( FTC_Manager manager,<br /> FTC_FaceID face_id );</p> <p> /*************************************************************************/<br /> /* */<br /> /* <Section> */<br /> /* cache_subsystem */<br /> /* */<br /> /*************************************************************************/</p> <p> /*************************************************************************<br /> *<br /> * @type:<br /> * FTC_CMapCache<br /> *<br /> * @description:<br /> * An opaque handle used to model a charmap cache. This cache is to<br /> * hold character codes -> glyph indices mappings.<br /> *<br /> */<br /> typedef struct FTC_CMapCacheRec_* FTC_CMapCache;</p> <p> /*************************************************************************<br /> *<br /> * @function:<br /> * FTC_CMapCache_New<br /> *<br /> * @description:<br /> * Create a new charmap cache.<br /> *<br /> * @input:<br /> * manager ::<br /> * A handle to the cache manager.<br /> *<br /> * @output:<br /> * acache ::<br /> * A new cache handle. NULL in case of error.<br /> *<br /> * @return:<br /> * FreeType error code. 0~means success.<br /> *<br /> * @note:<br /> * Like all other caches, this one will be destroyed with the cache<br /> * manager.<br /> *<br /> */<br /> FT_EXPORT( FT_Error )<br /> FTC_CMapCache_New( FTC_Manager manager,<br /> FTC_CMapCache *acache );</p> <p> /************************************************************************<br /> *<br /> * @function:<br /> * FTC_CMapCache_Lookup<br /> *<br /> * @description:<br /> * Translate a character code into a glyph index, using the charmap<br /> * cache.<br /> *<br /> * @input:<br /> * cache ::<br /> * A charmap cache handle.<br /> *<br /> * face_id ::<br /> * The source face ID.<br /> *<br /> * cmap_index ::<br /> * The index of the charmap in the source face. Any negative value<br /> * means to use the cache @FT_Face’s default charmap.<br /> *<br /> * char_code ::<br /> * The character code (in the corresponding charmap).<br /> *<br /> * @return:<br /> * Glyph index. 0~means `no glyph’.<br /> *<br /> */<br /> FT_EXPORT( FT_UInt )<br /> FTC_CMapCache_Lookup( FTC_CMapCache cache,<br /> FTC_FaceID face_id,<br /> FT_Int cmap_index,<br /> FT_UInt32 char_code );</p> <p> /*************************************************************************/<br /> /* */<br /> /* <Section> */<br /> /* cache_subsystem */<br /> /* */<br /> /*************************************************************************/</p> <p> /*************************************************************************/<br /> /*************************************************************************/<br /> /*************************************************************************/<br /> /***** *****/<br /> /***** IMAGE CACHE OBJECT *****/<br /> /***** *****/<br /> /*************************************************************************/<br /> /*************************************************************************/<br /> /*************************************************************************/</p> <p> /*************************************************************************<br /> *<br /> * @struct:<br /> * FTC_ImageTypeRec<br /> *<br /> * @description:<br /> * A structure used to model the type of images in a glyph cache.<br /> *<br /> * @fields:<br /> * face_id ::<br /> * The face ID.<br /> *<br /> * width ::<br /> * The width in pixels.<br /> *<br /> * height ::<br /> * The height in pixels.<br /> *<br /> * flags ::<br /> * The load flags, as in @FT_Load_Glyph.<br /> *<br /> */<br /> typedef struct FTC_ImageTypeRec_<br /> {<br /> FTC_FaceID face_id;<br /> FT_UInt width;<br /> FT_UInt height;<br /> FT_Int32 flags;</p> <p> } FTC_ImageTypeRec;</p> <p> /*************************************************************************<br /> *<br /> * @type:<br /> * FTC_ImageType<br /> *<br /> * @description:<br /> * A handle to an @FTC_ImageTypeRec structure.<br /> *<br /> */<br /> typedef struct FTC_ImageTypeRec_* FTC_ImageType;</p> <p> /* */</p> <p>#define FTC_IMAGE_TYPE_COMPARE( d1, d2 ) \<br /> ( (d1)->face_id == (d2)->face_id && \<br /> (d1)->width == (d2)->width && \<br /> (d1)->flags == (d2)->flags )</p> <p> /*************************************************************************/<br /> /* */<br /> /* <Type> */<br /> /* FTC_ImageCache */<br /> /* */<br /> /* <Description> */<br /> /* A handle to a glyph image cache object. They are designed to */<br /> /* hold many distinct glyph images while not exceeding a certain */<br /> /* memory threshold. */<br /> /* */<br /> typedef struct FTC_ImageCacheRec_* FTC_ImageCache;</p> <p> /*************************************************************************/<br /> /* */<br /> /* <Function> */<br /> /* FTC_ImageCache_New */<br /> /* */<br /> /* <Description> */<br /> /* Create a new glyph image cache. */<br /> /* */<br /> /* <Input> */<br /> /* manager :: The parent manager for the image cache. */<br /> /* */<br /> /* <Output> */<br /> /* acache :: A handle to the new glyph image cache object. */<br /> /* */<br /> /* <Return> */<br /> /* FreeType error code. 0~means success. */<br /> /* */<br /> FT_EXPORT( FT_Error )<br /> FTC_ImageCache_New( FTC_Manager manager,<br /> FTC_ImageCache *acache );</p> <p> /*************************************************************************/<br /> /* */<br /> /* <Function> */<br /> /* FTC_ImageCache_Lookup */<br /> /* */<br /> /* <Description> */<br /> /* Retrieve a given glyph image from a glyph image cache. */<br /> /* */<br /> /* <Input> */<br /> /* cache :: A handle to the source glyph image cache. */<br /> /* */<br /> /* type :: A pointer to a glyph image type descriptor. */<br /> /* */<br /> /* gindex :: The glyph index to retrieve. */<br /> /* */<br /> /* <Output> */<br /> /* aglyph :: The corresponding @FT_Glyph object. 0~in case of */<br /> /* failure. */<br /> /* */<br /> /* anode :: Used to return the address of of the corresponding cache */<br /> /* node after incrementing its reference count (see note */<br /> /* below). */<br /> /* */<br /> /* <Return> */<br /> /* FreeType error code. 0~means success. */<br /> /* */<br /> /* <Note> */<br /> /* The returned glyph is owned and managed by the glyph image cache. */<br /> /* Never try to transform or discard it manually! You can however */<br /> /* create a copy with @FT_Glyph_Copy and modify the new one. */<br /> /* */<br /> /* If `anode’ is _not_ NULL, it receives the address of the cache */<br /> /* node containing the glyph image, after increasing its reference */<br /> /* count. This ensures that the node (as well as the @FT_Glyph) will */<br /> /* always be kept in the cache until you call @FTC_Node_Unref to */<br /> /* `release’ it. */<br /> /* */<br /> /* If `anode’ is NULL, the cache node is left unchanged, which means */<br /> /* that the @FT_Glyph could be flushed out of the cache on the next */<br /> /* call to one of the caching sub-system APIs. Don’t assume that it */<br /> /* is persistent! */<br /> /* */<br /> FT_EXPORT( FT_Error )<br /> FTC_ImageCache_Lookup( FTC_ImageCache cache,<br /> FTC_ImageType type,<br /> FT_UInt gindex,<br /> FT_Glyph *aglyph,<br /> FTC_Node *anode );</p> <p> /*************************************************************************/<br /> /* */<br /> /* <Function> */<br /> /* FTC_ImageCache_LookupScaler */<br /> /* */<br /> /* <Description> */<br /> /* A variant of @FTC_ImageCache_Lookup that uses an @FTC_ScalerRec */<br /> /* to specify the face ID and its size. */<br /> /* */<br /> /* <Input> */<br /> /* cache :: A handle to the source glyph image cache. */<br /> /* */<br /> /* scaler :: A pointer to a scaler descriptor. */<br /> /* */<br /> /* load_flags :: The corresponding load flags. */<br /> /* */<br /> /* gindex :: The glyph index to retrieve. */<br /> /* */<br /> /* <Output> */<br /> /* aglyph :: The corresponding @FT_Glyph object. 0~in case of */<br /> /* failure. */<br /> /* */<br /> /* anode :: Used to return the address of of the corresponding */<br /> /* cache node after incrementing its reference count */<br /> /* (see note below). */<br /> /* */<br /> /* <Return> */<br /> /* FreeType error code. 0~means success. */<br /> /* */<br /> /* <Note> */<br /> /* The returned glyph is owned and managed by the glyph image cache. */<br /> /* Never try to transform or discard it manually! You can however */<br /> /* create a copy with @FT_Glyph_Copy and modify the new one. */<br /> /* */<br /> /* If `anode’ is _not_ NULL, it receives the address of the cache */<br /> /* node containing the glyph image, after increasing its reference */<br /> /* count. This ensures that the node (as well as the @FT_Glyph) will */<br /> /* always be kept in the cache until you call @FTC_Node_Unref to */<br /> /* `release’ it. */<br /> /* */<br /> /* If `anode’ is NULL, the cache node is left unchanged, which means */<br /> /* that the @FT_Glyph could be flushed out of the cache on the next */<br /> /* call to one of the caching sub-system APIs. Don’t assume that it */<br /> /* is persistent! */<br /> /* */<br /> /* Calls to @FT_Set_Char_Size and friends have no effect on cached */<br /> /* glyphs; you should always use the FreeType cache API instead. */<br /> /* */<br /> FT_EXPORT( FT_Error )<br /> FTC_ImageCache_LookupScaler( FTC_ImageCache cache,<br /> FTC_Scaler scaler,<br /> FT_ULong load_flags,<br /> FT_UInt gindex,<br /> FT_Glyph *aglyph,<br /> FTC_Node *anode );</p> <p> /*************************************************************************/<br /> /* */<br /> /* <Type> */<br /> /* FTC_SBit */<br /> /* */<br /> /* <Description> */<br /> /* A handle to a small bitmap descriptor. See the @FTC_SBitRec */<br /> /* structure for details. */<br /> /* */<br /> typedef struct FTC_SBitRec_* FTC_SBit;</p> <p> /*************************************************************************/<br /> /* */<br /> /* <Struct> */<br /> /* FTC_SBitRec */<br /> /* */<br /> /* <Description> */<br /> /* A very compact structure used to describe a small glyph bitmap. */<br /> /* */<br /> /* <Fields> */<br /> /* width :: The bitmap width in pixels. */<br /> /* */<br /> /* height :: The bitmap height in pixels. */<br /> /* */<br /> /* left :: The horizontal distance from the pen position to the */<br /> /* left bitmap border (a.k.a. `left side bearing’, or */<br /> /* `lsb’). */<br /> /* */<br /> /* top :: The vertical distance from the pen position (on the */<br /> /* baseline) to the upper bitmap border (a.k.a. `top */<br /> /* side bearing’). The distance is positive for upwards */<br /> /* y~coordinates. */<br /> /* */<br /> /* format :: The format of the glyph bitmap (monochrome or gray). */<br /> /* */<br /> /* max_grays :: Maximum gray level value (in the range 1 to~255). */<br /> /* */<br /> /* pitch :: The number of bytes per bitmap line. May be positive */<br /> /* or negative. */<br /> /* */<br /> /* xadvance :: The horizontal advance width in pixels. */<br /> /* */<br /> /* yadvance :: The vertical advance height in pixels. */<br /> /* */<br /> /* buffer :: A pointer to the bitmap pixels. */<br /> /* */<br /> typedef struct FTC_SBitRec_<br /> {<br /> FT_Byte width;<br /> FT_Byte height;<br /> FT_Char left;<br /> FT_Char top;</p> <p> FT_Byte format;<br /> FT_Byte max_grays;<br /> FT_Short pitch;<br /> FT_Char xadvance;<br /> FT_Char yadvance;</p> <p> FT_Byte* buffer;</p> <p> } FTC_SBitRec;</p> <p> /*************************************************************************/<br /> /* */<br /> /* <Type> */<br /> /* FTC_SBitCache */<br /> /* */<br /> /* <Description> */<br /> /* A handle to a small bitmap cache. These are special cache objects */<br /> /* used to store small glyph bitmaps (and anti-aliased pixmaps) in a */<br /> /* much more efficient way than the traditional glyph image cache */<br /> /* implemented by @FTC_ImageCache. */<br /> /* */<br /> typedef struct FTC_SBitCacheRec_* FTC_SBitCache;</p> <p> /*************************************************************************/<br /> /* */<br /> /* <Function> */<br /> /* FTC_SBitCache_New */<br /> /* */<br /> /* <Description> */<br /> /* Create a new cache to store small glyph bitmaps. */<br /> /* */<br /> /* <Input> */<br /> /* manager :: A handle to the source cache manager. */<br /> /* */<br /> /* <Output> */<br /> /* acache :: A handle to the new sbit cache. NULL in case of error. */<br /> /* */<br /> /* <Return> */<br /> /* FreeType error code. 0~means success. */<br /> /* */<br /> FT_EXPORT( FT_Error )<br /> FTC_SBitCache_New( FTC_Manager manager,<br /> FTC_SBitCache *acache );</p> <p> /*************************************************************************/<br /> /* */<br /> /* <Function> */<br /> /* FTC_SBitCache_Lookup */<br /> /* */<br /> /* <Description> */<br /> /* Look up a given small glyph bitmap in a given sbit cache and */<br /> /* `lock’ it to prevent its flushing from the cache until needed. */<br /> /* */<br /> /* <Input> */<br /> /* cache :: A handle to the source sbit cache. */<br /> /* */<br /> /* type :: A pointer to the glyph image type descriptor. */<br /> /* */<br /> /* gindex :: The glyph index. */<br /> /* */<br /> /* <Output> */<br /> /* sbit :: A handle to a small bitmap descriptor. */<br /> /* */<br /> /* anode :: Used to return the address of of the corresponding cache */<br /> /* node after incrementing its reference count (see note */<br /> /* below). */<br /> /* */<br /> /* <Return> */<br /> /* FreeType error code. 0~means success. */<br /> /* */<br /> /* <Note> */<br /> /* The small bitmap descriptor and its bit buffer are owned by the */<br /> /* cache and should never be freed by the application. They might */<br /> /* as well disappear from memory on the next cache lookup, so don’t */<br /> /* treat them as persistent data. */<br /> /* */<br /> /* The descriptor’s `buffer’ field is set to~0 to indicate a missing */<br /> /* glyph bitmap. */<br /> /* */<br /> /* If `anode’ is _not_ NULL, it receives the address of the cache */<br /> /* node containing the bitmap, after increasing its reference count. */<br /> /* This ensures that the node (as well as the image) will always be */<br /> /* kept in the cache until you call @FTC_Node_Unref to `release’ it. */<br /> /* */<br /> /* If `anode’ is NULL, the cache node is left unchanged, which means */<br /> /* that the bitmap could be flushed out of the cache on the next */<br /> /* call to one of the caching sub-system APIs. Don’t assume that it */<br /> /* is persistent! */<br /> /* */<br /> FT_EXPORT( FT_Error )<br /> FTC_SBitCache_Lookup( FTC_SBitCache cache,<br /> FTC_ImageType type,<br /> FT_UInt gindex,<br /> FTC_SBit *sbit,<br /> FTC_Node *anode );</p> <p> /*************************************************************************/<br /> /* */<br /> /* <Function> */<br /> /* FTC_SBitCache_LookupScaler */<br /> /* */<br /> /* <Description> */<br /> /* A variant of @FTC_SBitCache_Lookup that uses an @FTC_ScalerRec */<br /> /* to specify the face ID and its size. */<br /> /* */<br /> /* <Input> */<br /> /* cache :: A handle to the source sbit cache. */<br /> /* */<br /> /* scaler :: A pointer to the scaler descriptor. */<br /> /* */<br /> /* load_flags :: The corresponding load flags. */<br /> /* */<br /> /* gindex :: The glyph index. */<br /> /* */<br /> /* <Output> */<br /> /* sbit :: A handle to a small bitmap descriptor. */<br /> /* */<br /> /* anode :: Used to return the address of of the corresponding */<br /> /* cache node after incrementing its reference count */<br /> /* (see note below). */<br /> /* */<br /> /* <Return> */<br /> /* FreeType error code. 0~means success. */<br /> /* */<br /> /* <Note> */<br /> /* The small bitmap descriptor and its bit buffer are owned by the */<br /> /* cache and should never be freed by the application. They might */<br /> /* as well disappear from memory on the next cache lookup, so don’t */<br /> /* treat them as persistent data. */<br /> /* */<br /> /* The descriptor’s `buffer’ field is set to~0 to indicate a missing */<br /> /* glyph bitmap. */<br /> /* */<br /> /* If `anode’ is _not_ NULL, it receives the address of the cache */<br /> /* node containing the bitmap, after increasing its reference count. */<br /> /* This ensures that the node (as well as the image) will always be */<br /> /* kept in the cache until you call @FTC_Node_Unref to `release’ it. */<br /> /* */<br /> /* If `anode’ is NULL, the cache node is left unchanged, which means */<br /> /* that the bitmap could be flushed out of the cache on the next */<br /> /* call to one of the caching sub-system APIs. Don’t assume that it */<br /> /* is persistent! */<br /> /* */<br /> FT_EXPORT( FT_Error )<br /> FTC_SBitCache_LookupScaler( FTC_SBitCache cache,<br /> FTC_Scaler scaler,<br /> FT_ULong load_flags,<br /> FT_UInt gindex,<br /> FTC_SBit *sbit,<br /> FTC_Node *anode );</p> <p> /* */</p> <p>FT_END_HEADER</p> <p>#endif /* __FTCACHE_H__ */</p> <p>/* END */</p> </div><!-- .entry-content .clear --> </div> </article><!-- #post-## --> <nav class="navigation post-navigation" aria-label="Posts"> <div class="nav-links"><div class="nav-previous"><a title="CS代考计算机代写 /***************************************************************************/" href="https://powcoder.com/2021/02/13/cs%e4%bb%a3%e8%80%83%e8%ae%a1%e7%ae%97%e6%9c%ba%e4%bb%a3%e5%86%99-66/" rel="prev"><span class="ast-left-arrow" aria-hidden="true">←</span> Previous Post</a></div><div class="nav-next"><a title="CS代考计算机代写 # Max2Obj Version 4.0 Mar 10th, 2001" 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