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nsRegionPool.h
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00037 
00038 #ifndef nsRegionPool_h___
00039 #define nsRegionPool_h___
00040 
00041 #include "nscore.h"
00042 #include <Quickdraw.h>
00043 
00044 
00045 class NS_EXPORT nsNativeRegionPool
00046 {
00047 public:
00048        nsNativeRegionPool();
00049        ~nsNativeRegionPool();
00050 
00051        RgnHandle                                 GetNewRegion();
00052        void                                             ReleaseRegion(RgnHandle aRgnHandle);
00053 
00054 private:
00055        struct nsRegionSlot {
00056               RgnHandle                          mRegion;
00057               nsRegionSlot*        mNext;
00058        };
00059 
00060        nsRegionSlot*               mRegionSlots;
00061        nsRegionSlot*               mEmptySlots;
00062 };
00063 
00064 //------------------------------------------------------------------------
00065 
00066 extern NS_EXPORT nsNativeRegionPool sNativeRegionPool;
00067 
00068 //------------------------------------------------------------------------
00069 
00070 class StRegionFromPool 
00071 {
00072 public:
00073        StRegionFromPool()
00074        {
00075               mRegionH = sNativeRegionPool.GetNewRegion();
00076        }
00077        
00078        ~StRegionFromPool()
00079        {
00080               if ( mRegionH )
00081                      sNativeRegionPool.ReleaseRegion(mRegionH);
00082        }
00083 
00084        operator RgnHandle() const
00085        {
00086               return mRegionH;
00087        }
00088 
00089        private:
00090               RgnHandle mRegionH;
00091 };
00092 
00093 
00094 
00095 #endif // nsRegionPool_h___