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/***************************************************************************/
/* */
/* ftcglyph.h */
/* */
/* FreeType abstract glyph cache (specification). */
/* */
/* Copyright 2000-2001 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. */
/* */
/***************************************************************************/
/*************************************************************************/
/* */
/* Important: The functions defined in this file are only used to */
/* implement an abstract glyph cache class. You need to */
/* provide additional logic to implement a complete cache. */
/* For example, see `ftcimage.h' and `ftcimage.c' which */
/* implement a FT_Glyph cache based on this code. */
/* */
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/********* *********/
/********* WARNING, THIS IS BETA CODE. *********/
/********* *********/
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
#ifndef __FTCGLYPH_H__
#define __FTCGLYPH_H__
#include <ft2build.h>
#include FT_CACHE_H
#include FT_CACHE_MANAGER_H
#include <stddef.h>
FT_BEGIN_HEADER
/* each glyph set is characterized by a "glyph set type" which must be */
/* defined by sub-classes */
typedef struct FTC_GlyphFamilyRec_* FTC_GlyphFamily;
/* handle to a glyph cache node */
typedef struct FTC_GlyphNodeRec_* FTC_GlyphNode;
/* size should be 24 + chunk size on 32-bit machines; */
/* note that the node's hash is ((gfam->hash << 16) | glyph_index) -- */
/* this _must_ be set properly by the glyph node initializer */
/* */
typedef struct FTC_GlyphNodeRec_
{
FTC_NodeRec node;
FT_UShort item_count;
FT_UShort item_start;
} FTC_GlyphNodeRec;
#define FTC_GLYPH_NODE( x ) ( (FTC_GlyphNode)(x) )
#define FTC_GLYPH_NODE_P( x ) ( (FTC_GlyphNode*)(x) )
typedef struct FTC_GlyphQueryRec_
{
FTC_QueryRec query;
FT_UInt gindex;
} FTC_GlyphQueryRec, *FTC_GlyphQuery;
#define FTC_GLYPH_QUERY( x ) ( (FTC_GlyphQuery)(x) )
/* a glyph set is used to categorize glyphs of a given type */
typedef struct FTC_GlyphFamilyRec_
{
FTC_FamilyRec family;
FT_UInt32 hash;
FT_UInt item_total; /* total number of glyphs in family */
FT_UInt item_count; /* number of glyph items per node */
} FTC_GlyphFamilyRec;
#define FTC_GLYPH_FAMILY( x ) ( (FTC_GlyphFamily)(x) )
#define FTC_GLYPH_FAMILY_P( x ) ( (FTC_GlyphFamily*)(x) )
#define FTC_GLYPH_FAMILY_MEMORY( x ) FTC_FAMILY(x)->cache->memory
/* each glyph node contains a 'chunk' of glyph items; */
/* translate a glyph index into a chunk index */
#define FTC_GLYPH_FAMILY_CHUNK( gfam, gindex ) \
( ( gindex ) / FTC_GLYPH_FAMILY( gfam )->item_count )
/* find a glyph index's chunk, and return its start index */
#define FTC_GLYPH_FAMILY_START( gfam, gindex ) \
( FTC_GLYPH_FAMILY_CHUNK( gfam, gindex ) * \
FTC_GLYPH_FAMILY( gfam )->item_count )
/* compute a glyph request's hash value */
#define FTC_GLYPH_FAMILY_HASH( gfam, gindex ) \
( (FT_UFast)( \
( FTC_GLYPH_FAMILY( gfam )->hash << 16 ) | \
( FTC_GLYPH_FAMILY_CHUNK( gfam, gindex ) & 0xFFFF ) ) )
/* must be called in an FTC_Family_CompareFunc to update the query */
/* whenever a glyph set is matched in the lookup, or when it */
/* is created */
#define FTC_GLYPH_FAMILY_FOUND( gfam, gquery ) \
do \
{ \
FTC_QUERY( gquery )->family = FTC_FAMILY( gfam ); \
FTC_QUERY( gquery )->hash = \
FTC_GLYPH_FAMILY_HASH( gfam, \
FTC_GLYPH_QUERY( gquery )->gindex ); \
} while ( 0 )
/* retrieve glyph index of glyph node */
#define FTC_GLYPH_NODE_GINDEX( x ) \
( (FT_UInt)( FTC_GLYPH_NODE( x )->node.hash & 0xFFFF ) )
/*************************************************************************/
/* */
/* These functions are exported so that they can be called from */
/* user-provided cache classes; otherwise, they are really part of the */
/* cache sub-system internals. */
/* */
/* must be called by derived FTC_Node_InitFunc routines */
FT_EXPORT( void )
ftc_glyph_node_init( FTC_GlyphNode node,
FT_UInt gindex, /* glyph index for node */
FTC_GlyphFamily gfam );
/* returns TRUE iff the query's glyph index correspond to the node; */
/* this assumes that the "family" and "hash" fields of the query are */
/* already correctly set */
FT_EXPORT( FT_Bool )
ftc_glyph_node_compare( FTC_GlyphNode gnode,
FTC_GlyphQuery gquery );
/* must be called by derived FTC_Node_DoneFunc routines */
FT_EXPORT( void )
ftc_glyph_node_done( FTC_GlyphNode node,
FTC_Cache cache );
/* must be called by derived FTC_Family_InitFunc; */
/* calls "ftc_family_init" */
FT_EXPORT( FT_Error )
ftc_glyph_family_init( FTC_GlyphFamily gfam,
FT_UInt32 hash,
FT_UInt item_count,
FT_UInt item_total,
FTC_GlyphQuery gquery,
FTC_Cache cache );
FT_EXPORT( void )
ftc_glyph_family_done( FTC_GlyphFamily gfam );
/* */
FT_END_HEADER
#endif /* __FTCGLYPH_H__ */
/* END */
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