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nsGCCache.h
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00001 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
00002  *
00003  * ***** BEGIN LICENSE BLOCK *****
00004  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
00005  *
00006  * The contents of this file are subject to the Mozilla Public License Version
00007  * 1.1 (the "License"); you may not use this file except in compliance with
00008  * the License. You may obtain a copy of the License at
00009  * http://www.mozilla.org/MPL/
00010  *
00011  * Software distributed under the License is distributed on an "AS IS" basis,
00012  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
00013  * for the specific language governing rights and limitations under the
00014  * License.
00015  *
00016  * The Original Code is the Mozilla browser.
00017  *
00018  * The Initial Developer of the Original Code is
00019  * Netscape Communications Corporation.
00020  * Portions created by the Initial Developer are Copyright (C) 1999
00021  * the Initial Developer. All Rights Reserved.
00022  *
00023  * Contributor(s):
00024  *   Stuart Parmenter <pavlov@netscape.com>
00025  *   Mike Shaver <shaver@zeroknowledge.com>
00026  *
00027  * Alternatively, the contents of this file may be used under the terms of
00028  * either of the GNU General Public License Version 2 or later (the "GPL"),
00029  * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
00030  * in which case the provisions of the GPL or the LGPL are applicable instead
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00038  *
00039  * ***** END LICENSE BLOCK ***** */
00040 
00041 #include <gdk/gdk.h>
00042 #include <string.h>
00043 #include "prclist.h"
00044 
00045 #ifndef nsGCCache_h___
00046 #define nsGCCache_h___
00047 
00048 #define countof(x) ((int)(sizeof(x) / sizeof (*x)))
00049 #define GC_CACHE_SIZE 10
00050 
00051 #ifdef DEBUG
00052 #define DEBUG_METER(x) x
00053 #else
00054 #define DEBUG_METER(x)
00055 #endif
00056 
00057 struct GCCacheEntry
00058 {
00059   PRCList clist;
00060   GdkGCValuesMask flags;
00061   GdkGCValues gcv;
00062   GdkRegion *clipRegion;
00063   GdkGC *gc;
00064 };
00065 
00066 class nsGCCache
00067 {
00068  public:
00069   nsGCCache();
00070   virtual ~nsGCCache();
00071 
00072   static void Shutdown();
00073 
00074   void Flush(unsigned long flags);
00075 
00076   GdkGC *GetGC(GdkWindow *window, GdkGCValues *gcv, GdkGCValuesMask flags, GdkRegion *clipRegion);
00077   
00078 private:
00079   void ReuseGC(GCCacheEntry *entry, GdkGCValues *gcv, GdkGCValuesMask flags);
00080   PRCList GCCache;
00081   PRCList GCFreeList;
00082   void free_cache_entry(PRCList *clist);
00083   void move_cache_entry(PRCList *clist);
00084 #ifdef MOZ_WIDGET_GTK
00085   static GdkRegion * gdk_region_copy(GdkRegion *region);
00086 #endif
00087   static GdkRegion *copyRegion;
00088   void ReportStats();
00089 
00090   DEBUG_METER(
00091               struct {
00092                 int hits[GC_CACHE_SIZE];
00093                 int misses;
00094                 int reclaim;
00095               } GCCacheStats;
00096               )
00097 
00098 };
00099 
00100 #endif