http://www.ousob.com --- Legacy Redefined OuSob - File: /wwwroot/clipx/usr/include/freetype2/freetype/ftcache.h

/***************************************************************************/ /* */ /* ftcache.h */ /* */ /* FreeType Cache subsystem (specification). */ /* */ /* Copyright 1996-2001, 2002, 2003, 2004 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 */ /* still in beta. */ /* */ /* <Order> */ /* FTC_Manager */ /* FTC_FaceID */ /* FTC_Face_Requester */ /* */ /* FTC_Manager_New */ /* FTC_Manager_Reset */ /* FTC_Manager_Done */ /* FTC_Manager_LookupFace */ /* FTC_Manager_LookupSize */ /* FTC_Manager_RemoveFaceID */ /* */ /* FTC_Node */ /* FTC_Node_Unref */ /* */ /* FTC_Font */ /* FTC_ImageCache */ /* FTC_ImageCache_New */ /* FTC_ImageCache_Lookup */ /* */ /* FTC_SBit */ /* FTC_SBitCache */ /* FTC_SBitCache_New */ /* FTC_SBitCache_Lookup */ /* */ /* FTC_CMapCache */ /* FTC_CMapCache_New */ /* FTC_CMapCache_Lookup */ /* */ /*************************************************************************/ /*************************************************************************/ /*************************************************************************/ /*************************************************************************/ /***** *****/ /***** BASIC TYPE DEFINITIONS *****/ /***** *****/ /*************************************************************************/ /*************************************************************************/ /*************************************************************************/ /*************************************************************************/ /* */ /* <Type> */ /* FTC_FaceID */ /* */ /* <Description> */ /* An opaque pointer type that is used to identity face objects. The */ /* contents of such objects is application-dependent. */ /* */ typedef struct FTC_FaceIDRec_* 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 FT_POINTER_TO_ULONG( p ) ((FT_ULong)(FT_Pointer)(p)) #define FTC_FACE_ID_HASH( i ) \ ((FT_UInt32)(( FT_POINTER_TO_ULONG( i ) >> 3 ) ^ \ ( FT_POINTER_TO_ULONG( i ) << 7 ) ) ) #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 an @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. */ /* */ /* If you lookup nodes, you have the ability to "acquire" them, i.e., */ /* to increment their reference count. This will prevent the node */ /* from being flushed out of the cache until you explicitly "release" */ /* it (see @FTC_Node_Unref). */ /* */ /* See also @FTC_SBitCache_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_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 and @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_LookupFace */ /* */ /* <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_LookupSize 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_LookupFace( FTC_Manager manager, FTC_FaceID face_id, FT_Face *aface ); /*************************************************************************/ /* */ /* <Struct> */ /* FTC_ScalerRec */ /* */ /* <Description> */ /* A structure used to describe a given character size in either */ /* pixels or points to the cache manager. See */ /* @FTC_Manager_LookupSize. */ /* */ /* <Fields> */ /* face_id :: The source face ID. */ /* */ /* width :: The character width. */ /* */ /* height :: The character height. */ /* */ /* pixel :: A Boolean. If TRUE, the `width' and `height' fields */ /* are interpreted as integer pixel character sizes. */ /* Otherwise, they are expressed as 1/64th of points. */ /* */ /* x_res :: Only used when `pixel' is FALSE to indicate the */ /* horizontal resolution in dpi. */ /* */ /* y_res :: Only used when `pixel' is FALSE to indicate the */ /* vertical resolution in dpi. */ /* */ /* <Note> */ /* This type is mainly used to retrieve @FT_Size objects through the */ /* cache manager. */ /* */ typedef struct FTC_ScalerRec_ { FTC_FaceID face_id; FT_UInt width; FT_UInt height; FT_Int pixel; FT_UInt x_res; FT_UInt y_res; } FTC_ScalerRec, *FTC_Scaler; /*************************************************************************/ /* */ /* <Function> */ /* FTC_Manager_LookupSize */ /* */ /* <Description> */ /* Retrieve the @FT_Size object that corresponds to a given */ /* @FTC_Scaler through a cache manager. */ /* */ /* <Input> */ /* manager :: A handle to the cache manager. */ /* */ /* scaler :: A scaler handle. */ /* */ /* <Output> */ /* asize :: A handle to the size object. */ /* */ /* <Return> */ /* FreeType error code. 0 means success. */ /* */ /* <Note> */ /* The returned @FT_Size object is always owned by the manager. You */ /* should never try to discard it by yourself. */ /* */ /* You can access the parent @FT_Face object simply as `size->face' */ /* if you need it. Note that this object is also owned by the */ /* manager. */ /* */ FT_EXPORT( FT_Error ) FTC_Manager_LookupSize( FTC_Manager manager, FTC_Scaler scaler, 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 :: The cache node handle. */ /* */ /* manager :: The cache manager handle. */ /* */ FT_EXPORT( void ) FTC_Node_Unref( FTC_Node node, FTC_Manager manager ); /* remove all nodes belonging to a given face_id */ FT_EXPORT( void ) FTC_Manager_RemoveFaceID( FTC_Manager manager, FTC_FaceID face_id ); /*************************************************************************/ /* */ /* <Section> */ /* cache_subsystem */ /* */ /*************************************************************************/ /************************************************************************ * * @type: * FTC_CMapCache * * @description: * An opaque handle used to manager a charmap cache. This cache is * to hold character codes -> glyph indices mappings. */ typedef struct FTC_CMapCacheRec_* FTC_CMapCache; /*************************************************************************/ /* */ /* @function: */ /* FTC_CMapCache_New */ /* */ /* @description: */ /* Create a new charmap cache. */ /* */ /* @input: */ /* manager :: A handle to the cache manager. */ /* */ /* @output: */ /* acache :: A new cache handle. NULL in case of error. */ /* */ /* @return: */ /* FreeType error code. 0 means success. */ /* */ /* @note: */ /* Like all other caches, this one will be destroyed with the cache */ /* manager. */ /* */ FT_EXPORT( FT_Error ) FTC_CMapCache_New( FTC_Manager manager, FTC_CMapCache *acache ); /*************************************************************************/ /* */ /* @function: */ /* FTC_CMapCache_Lookup */ /* */ /* @description: */ /* Translate a character code into a glyph index, using the charmap */ /* cache. */ /* */ /* @input: */ /* cache :: A charmap cache handle. */ /* */ /* face_id :: The source face ID. */ /* */ /* cmap_index :: The index of the charmap in the source face. */ /* */ /* char_code :: The character code (in the corresponding charmap). */ /* */ /* @return: */ /* Glyph index. 0 means `no glyph'. */ /* */ FT_EXPORT( FT_UInt ) FTC_CMapCache_Lookup( FTC_CMapCache cache, FTC_FaceID face_id, FT_Int cmap_index, FT_UInt32 char_code ); /*************************************************************************/ /* */ /* <Section> */ /* cache_subsystem */ /* */ /*************************************************************************/ /*************************************************************************/ /*************************************************************************/ /*************************************************************************/ /***** *****/ /***** IMAGE CACHE OBJECT *****/ /***** *****/ /*************************************************************************/ /*************************************************************************/ /*************************************************************************/ typedef struct FTC_ImageTypeRec_ { FTC_FaceID face_id; FT_Int width; FT_Int height; FT_Int32 flags; } FTC_ImageTypeRec; typedef struct FTC_ImageTypeRec_* FTC_ImageType; /* */ #define FTC_IMAGE_TYPE_COMPARE( d1, d2 ) \ ( FTC_FONT_COMPARE( &(d1)->font, &(d2)->font ) && \ (d1)->flags == (d2)->flags ) #define FTC_IMAGE_TYPE_HASH( d ) \ (FT_UFast)( FTC_FONT_HASH( &(d)->font ) ^ \ ( (d)->flags << 4 ) ) /*************************************************************************/ /* */ /* <Type> */ /* FTC_ImageCache */ /* */ /* <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_ImageCacheRec_* FTC_ImageCache; /*************************************************************************/ /* */ /* <Function> */ /* FTC_ImageCache_New */ /* */ /* <Description> */ /* Creates a new glyph image cache. */ /* */ /* <Input> */ /* manager :: The parent manager for the image cache. */ /* */ /* <Output> */ /* acache :: A handle to the new glyph image cache object. */ /* */ /* <Return> */ /* FreeType error code. 0 means success. */ /* */ FT_EXPORT( FT_Error ) FTC_ImageCache_New( FTC_Manager manager, FTC_ImageCache *acache ); /*************************************************************************/ /* */ /* <Function> */ /* FTC_ImageCache_Lookup */ /* */ /* <Description> */ /* Retrieves a given glyph image from a glyph image cache. */ /* */ /* <Input> */ /* cache :: A handle to the source glyph image cache. */ /* */ /* type :: A pointer to a glyph image type descriptor. */ /* */ /* gindex :: The glyph index to retrieve. */ /* */ /* <Output> */ /* aglyph :: The corresponding @FT_Glyph object. 0 in case of */ /* failure. */ /* */ /* anode :: Used to return the address of of the corresponding cache */ /* node after incrementing its reference count (see note */ /* below). */ /* */ /* <Return> */ /* FreeType error code. 0 means success. */ /* */ /* <Note> */ /* The returned glyph is owned and managed 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. */ /* */ /* If `anode' is _not_ NULL, it receives the address of the cache */ /* node containing the glyph image, after increasing its reference */ /* count. This ensures that the node (as well as the FT_Glyph) will */ /* always be kept in the cache until you call @FTC_Node_Unref to */ /* `release' it. */ /* */ /* If `anode' is NULL, the cache node is left unchanged, which means */ /* that the FT_Glyph could be flushed out of the cache on the next */ /* call to one of the caching sub-system APIs. Don't assume that it */ /* is persistent! */ /* */ FT_EXPORT( FT_Error ) FTC_ImageCache_Lookup( FTC_ImageCache cache, FTC_ImageType type, FT_UInt gindex, FT_Glyph *aglyph, FTC_Node *anode ); /*************************************************************************/ /* */ /* <Type> */ /* FTC_SBit */ /* */ /* <Description> */ /* A handle to a small bitmap descriptor. See the @FTC_SBitRec */ /* structure for details. */ /* */ typedef struct FTC_SBitRec_* FTC_SBit; /*************************************************************************/ /* */ /* <Struct> */ /* FTC_SBitRec */ /* */ /* <Description> */ /* A very compact structure used to describe a small glyph bitmap. */ /* */ /* <Fields> */ /* width :: The bitmap width in pixels. */ /* */ /* height :: The bitmap height in pixels. */ /* */ /* left :: The horizontal distance from the pen position to the */ /* left bitmap border (a.k.a. `left side bearing', or */ /* `lsb'). */ /* */ /* top :: The vertical distance from the pen position (on the */ /* baseline) to the upper bitmap border (a.k.a. `top */ /* side bearing'). The distance is positive for upwards */ /* Y coordinates. */ /* */ /* format :: The format of the glyph bitmap (monochrome or gray). */ /* */ /* max_grays :: Maximum gray level value (in the range 1 to 255). */ /* */ /* pitch :: The number of bytes per bitmap line. May be positive */ /* or negative. */ /* */ /* xadvance :: The horizontal advance width in pixels. */ /* */ /* yadvance :: The vertical advance height in pixels. */ /* */ /* buffer :: A pointer to the bitmap pixels. */ /* */ typedef struct FTC_SBitRec_ { FT_Byte width; FT_Byte height; FT_Char left; FT_Char top; FT_Byte format; FT_Byte max_grays; FT_Short pitch; FT_Char xadvance; FT_Char yadvance; FT_Byte* buffer; } FTC_SBitRec; /*************************************************************************/ /* */ /* <Type> */ /* FTC_SBitCache */ /* */ /* <Description> */ /* A handle to a small bitmap cache. These are special cache objects */ /* used to store small glyph bitmaps (and anti-aliased pixmaps) in a */ /* much more efficient way than the traditional glyph image cache */ /* implemented by @FTC_ImageCache. */ /* */ typedef struct FTC_SBitCacheRec_* FTC_SBitCache; /*************************************************************************/ /* */ /* <Function> */ /* FTC_SBitCache_New */ /* */ /* <Description> */ /* Creates a new cache to store small glyph bitmaps. */ /* */ /* <Input> */ /* manager :: A handle to the source cache manager. */ /* */ /* <Output> */ /* acache :: A handle to the new sbit cache. NULL in case of error. */ /* */ /* <Return> */ /* FreeType error code. 0 means success. */ /* */ FT_EXPORT( FT_Error ) FTC_SBitCache_New( FTC_Manager manager, FTC_SBitCache *acache ); /*************************************************************************/ /* */ /* <Function> */ /* FTC_SBitCache_Lookup */ /* */ /* <Description> */ /* Looks up a given small glyph bitmap in a given sbit cache and */ /* `lock' it to prevent its flushing from the cache until needed. */ /* */ /* <Input> */ /* cache :: A handle to the source sbit cache. */ /* */ /* type :: A pointer to the glyph image type descriptor. */ /* */ /* gindex :: The glyph index. */ /* */ /* <Output> */ /* sbit :: A handle to a small bitmap descriptor. */ /* */ /* anode :: Used to return the address of of the corresponding cache */ /* node after incrementing its reference count (see note */ /* below). */ /* */ /* <Return> */ /* FreeType error code. 0 means success. */ /* */ /* <Note> */ /* The small bitmap descriptor and its bit buffer are owned by the */ /* cache and should never be freed by the application. They might */ /* as well disappear from memory on the next cache lookup, so don't */ /* treat them as persistent data. */ /* */ /* The descriptor's `buffer' field is set to 0 to indicate a missing */ /* glyph bitmap. */ /* */ /* If `anode' is _not_ NULL, it receives the address of the cache */ /* node containing the bitmap, after increasing its reference count. */ /* This ensures that the node (as well as the image) will always be */ /* kept in the cache until you call @FTC_Node_Unref to `release' it. */ /* */ /* If `anode' is NULL, the cache node is left unchanged, which means */ /* that the bitmap could be flushed out of the cache on the next */ /* call to one of the caching sub-system APIs. Don't assume that it */ /* is persistent! */ /* */ FT_EXPORT( FT_Error ) FTC_SBitCache_Lookup( FTC_SBitCache cache, FTC_ImageType type, FT_UInt gindex, FTC_SBit *sbit, FTC_Node *anode ); /* */ FT_END_HEADER #endif /* __FTCACHE_H__ */ /* END */