/****************************************************************************
 *
 * ftcimage.h
 *
 *   FreeType Generic Image cache (specification)
 *
 * Copyright (C) 2000-2019 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.
 *
 */


 /*
  * FTC_ICache is an _abstract_ cache used to store a single FT_Glyph
  * image per cache node.
  *
  * FTC_ICache extends FTC_GCache.  For an implementation example,
  * see FTC_ImageCache in `src/cache/ftbasic.c'.
  */


  /**************************************************************************
   *
   * Each image cache really manages FT_Glyph objects.
   *
   */


#ifndef FTCIMAGE_H_
#define FTCIMAGE_H_


#include <ft2build.h>
#include FT_CACHE_H
#include "ftcglyph.h"

FT_BEGIN_HEADER


  /* the FT_Glyph image node type - we store only 1 glyph per node */
  typedef struct  FTC_INodeRec_
  {
    FTC_GNodeRec  gnode;
    FT_Glyph      glyph;

  } FTC_INodeRec, *FTC_INode;

#define FTC_INODE( x )         ( (FTC_INode)( x ) )
#define FTC_INODE_GINDEX( x )  FTC_GNODE(x)->gindex
#define FTC_INODE_FAMILY( x )  FTC_GNODE(x)->family

  typedef FT_Error
  (*FTC_IFamily_LoadGlyphFunc)( FTC_Family  family,
                                FT_UInt     gindex,
                                FTC_Cache   cache,
                                FT_Glyph   *aglyph );

  typedef struct  FTC_IFamilyClassRec_
  {
    FTC_MruListClassRec        clazz;
    FTC_IFamily_LoadGlyphFunc  family_load_glyph;

  } FTC_IFamilyClassRec;

  typedef const FTC_IFamilyClassRec*  FTC_IFamilyClass;

#define FTC_IFAMILY_CLASS( x )  ((FTC_IFamilyClass)(x))

#define FTC_CACHE_IFAMILY_CLASS( x ) \
          FTC_IFAMILY_CLASS( FTC_CACHE_GCACHE_CLASS(x)->family_class )


  /* can be used as a @FTC_Node_FreeFunc */
  FT_LOCAL( void )
  FTC_INode_Free( FTC_INode  inode,
                  FTC_Cache  cache );

  /* Can be used as @FTC_Node_NewFunc.  `gquery.index' and `gquery.family'
   * must be set correctly.  This function will call the `family_load_glyph'
   * method to load the FT_Glyph into the cache node.
   */
  FT_LOCAL( FT_Error )
  FTC_INode_New( FTC_INode   *pinode,
                 FTC_GQuery   gquery,
                 FTC_Cache    cache );

#if 0
  /* can be used as @FTC_Node_WeightFunc */
  FT_LOCAL( FT_ULong )
  FTC_INode_Weight( FTC_INode  inode );
#endif


 /* */

FT_END_HEADER

#endif /* FTCIMAGE_H_ */


/* END */
