/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
 *
 * The contents of this file are subject to the Mozilla Public
 * License Version 1.1 (the "License"); you may not use this file
 * except in compliance with the License. You may obtain a copy of
 * the License at http://www.mozilla.org/MPL/
 * 
 * Software distributed under the License is distributed on an "AS
 * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
 * implied. See the License for the specific language governing
 * rights and limitations under the License.
 * 
 * The Original Code is the Mozilla browser.
 * 
 * The Initial Developer of the Original Code is Netscape
 * Communications Corporation. Portions created by Netscape are
 * Copyright (C) 1999 Netscape Communications Corporation. All
 * Rights Reserved.
 * 
 * Contributor(s): 
 *   Stuart Parmenter <pavlov@netscape.com>
 *   Mike Shaver <shaver@zeroknowledge.com>
 */

#include <gdk/gdk.h>
#include <string.h>
#include "prclist.h"

#ifndef nsGCCache_h___
#define nsGCCache_h___

#define countof(x) ((int)(sizeof(x) / sizeof (*x)))
#define GC_CACHE_SIZE 10

#ifdef DEBUG
#define DEBUG_METER(x) x
#else
#define DEBUG_METER(x)
#endif

struct GCCacheEntry
{
  PRCList clist;
  GdkGCValuesMask flags;
  GdkGCValues gcv;
  GdkRegion *clipRegion;
  GdkGC *gc;
};

class nsGCCache
{
 public:
  nsGCCache();
  virtual ~nsGCCache();

  static void Shutdown();

  void Flush(unsigned long flags);

  GdkGC *GetGC(GdkWindow *window, GdkGCValues *gcv, GdkGCValuesMask flags, GdkRegion *clipRegion);
  
private:
  void ReuseGC(GCCacheEntry *entry, GdkGCValues *gcv, GdkGCValuesMask flags);
  PRCList GCCache;
  PRCList GCFreeList;
  void free_cache_entry(PRCList *clist);
  void move_cache_entry(PRCList *clist);
#ifdef MOZ_WIDGET_GTK
  static GdkRegion * gdk_region_copy(GdkRegion *region);
#endif
  static GdkRegion *copyRegion;
  void ReportStats();

  DEBUG_METER(
              struct {
                int hits[GC_CACHE_SIZE];
                int misses;
                int reclaim;
              } GCCacheStats;
              )

};

#endif