/* Copyright (C) 2001-2006 Artifex Software, Inc.
   All Rights Reserved.
  
   This software is provided AS-IS with no warranty, either express or
   implied.

   This software is distributed under license and may not be copied, modified
   or distributed except as expressly authorized under the terms of that
   license.  Refer to licensing information at http://www.artifex.com/
   or contact Artifex Software, Inc.,  7 Mt. Lassen Drive - Suite A-134,
   San Rafael, CA  94903, U.S.A., +1(415)492-9861, for further information.
*/

/* $Id: gxpcache.h,v 1.2 2010/07/10 22:02:22 Arabidopsis Exp $ */
/* Definition of Pattern cache */

#ifndef gxpcache_INCLUDED
#  define gxpcache_INCLUDED

/*
 * Define a cache for rendered Patterns.  This is currently an open
 * hash table with single probing (no reprobing) and round-robin
 * replacement.  Obviously, we can do better in both areas.
 */
#ifndef gx_pattern_cache_DEFINED
#  define gx_pattern_cache_DEFINED
typedef struct gx_pattern_cache_s gx_pattern_cache;

#endif
#ifndef gx_color_tile_DEFINED
#  define gx_color_tile_DEFINED
typedef struct gx_color_tile_s gx_color_tile;

#endif
struct gx_pattern_cache_s {
    gs_memory_t *memory;
    gx_color_tile *tiles;
    uint num_tiles;
    uint tiles_used;
    uint next;			/* round-robin index */
    ulong bits_used;
    ulong max_bits;
    void (*free_all) (gx_pattern_cache *);
};

#define private_st_pattern_cache() /* in gxpcmap.c */\
  gs_private_st_ptrs1(st_pattern_cache, gx_pattern_cache,\
    "gx_pattern_cache", pattern_cache_enum, pattern_cache_reloc, tiles)

#endif /* gxpcache_INCLUDED */
