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nsGraphicsStatePh.h
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00001 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
00002 /* ***** BEGIN LICENSE BLOCK *****
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00010  * Software distributed under the License is distributed on an "AS IS" basis,
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00014  *
00015  * The Original Code is mozilla.org code.
00016  *
00017  * The Initial Developer of the Original Code is
00018  * Netscape Communications Corporation.
00019  * Portions created by the Initial Developer are Copyright (C) 1998
00020  * the Initial Developer. All Rights Reserved.
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00022  * Contributor(s):
00023  *
00024  * Alternatively, the contents of this file may be used under the terms of
00025  * either of the GNU General Public License Version 2 or later (the "GPL"),
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00037 
00038 #ifndef nsGraphicsStatePh_h___
00039 #define nsGraphicsStatePh_h___
00040 
00041 #include "nsIRenderingContext.h"
00042 #include "nsIFontMetrics.h"
00043 #include "nsTransform2D.h"
00044 #include "nsRegionPh.h"
00045 #include "nsCOMPtr.h"
00046 
00047 class nsGraphicsState
00048 {
00049 public:
00050 
00051   nsTransform2D  *mMatrix;
00052   nsCOMPtr<nsIRegion> mClipRegion;
00053   nscolor         mColor;
00054        nsLineStyle     mLineStyle;
00055   nsIFontMetrics *mFontMetrics;
00056 
00057   nsGraphicsState *mNext; // link into free list of graphics states.
00058 
00059   friend class nsGraphicsStatePool;
00060 
00061 #ifndef USE_GS_POOL
00062   friend class nsRenderingContextPh;
00063 #endif
00064 
00065 private:
00066   inline nsGraphicsState()
00067               {
00068               mMatrix = nsnull;
00069               mClipRegion = nsnull;
00070               mColor = NS_RGB(0, 0, 0);
00071               mLineStyle = nsLineStyle_kSolid;
00072               mFontMetrics = nsnull;
00073               }
00074 
00075        inline
00076   ~nsGraphicsState()
00077               {
00078               NS_IF_RELEASE(mFontMetrics);
00079               }
00080 };
00081 
00082 class nsGraphicsStatePool
00083 {
00084 public:
00085 
00086   static
00087        inline nsGraphicsState * GetNewGS()
00088               {
00089        nsGraphicsStatePool * thePool = PrivateGetPool();
00090        return thePool->PrivateGetNewGS();
00091               }
00092 
00093   static inline void ReleaseGS(nsGraphicsState* aGS)
00094               {
00095        nsGraphicsStatePool * thePool = PrivateGetPool();
00096        thePool->PrivateReleaseGS(aGS);
00097               }
00098   
00099   
00100        inline
00101   nsGraphicsStatePool() { mFreeList = nsnull; }
00102 
00103   inline ~nsGraphicsStatePool()
00104               {
00105        nsGraphicsState* gs = mFreeList;
00106        while (gs != nsnull) {
00107        nsGraphicsState* next = gs->mNext;
00108        delete gs;
00109        gs = next;
00110               }
00111               }
00112   
00113 private:
00114   nsGraphicsState*   mFreeList;
00115   
00116   inline static nsGraphicsStatePool * PrivateGetPool();
00117   inline nsGraphicsState *            PrivateGetNewGS();
00118   inline void                                      PrivateReleaseGS(nsGraphicsState* aGS);
00119   
00120   static nsGraphicsStatePool * gsThePool;
00121 };
00122 
00123 #endif /* nsGraphicsStatePh_h___ */