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framedataholder.h
Go to the documentation of this file.00001 /* 00002 Copyright (C) 2004 by Jorrit Tyberghein 00003 (C) 2004 by Frank Richter 00004 00005 This library is free software; you can redistribute it and/or 00006 modify it under the terms of the GNU Library General Public 00007 License as published by the Free Software Foundation; either 00008 version 2 of the License, or (at your option) any later version. 00009 00010 This library is distributed in the hope that it will be useful, 00011 but WITHOUT ANY WARRANTY; without even the implied warranty of 00012 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 00013 Library General Public License for more details. 00014 00015 You should have received a copy of the GNU Library General Public 00016 License along with this library; if not, write to the Free 00017 Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 00018 */ 00019 00020 #ifndef __CS_CSTOOL_FRAMEDATAHOLDER_H__ 00021 #define __CS_CSTOOL_FRAMEDATAHOLDER_H__ 00022 00028 #include "csutil/array.h" 00029 00036 template <class T> 00037 class csFrameDataHolder 00038 { 00039 struct FrameData 00040 { 00041 uint lastFrame; 00042 T data; 00043 }; 00044 csArray<FrameData> data; 00045 size_t lastData; 00046 uint nextShrink; 00047 public: 00048 csFrameDataHolder () 00049 { 00050 lastData = 0; 00051 nextShrink = 0; 00052 } 00053 ~csFrameDataHolder () 00054 { 00055 } 00056 00064 T& GetUnusedData (bool& created, uint frameNumber) 00065 { 00066 created = false; 00067 if ((data.Length() == 0) || (data[lastData].lastFrame == frameNumber)) 00068 { 00069 lastData = (size_t)-1; 00070 //check the list 00071 size_t i; 00072 for(i = 0; i < data.Length (); i++) 00073 { 00074 if (data[i].lastFrame != frameNumber) 00075 { 00076 lastData = i; 00077 break; 00078 } 00079 } 00080 if (lastData == (size_t)-1) 00081 { 00082 data.SetLength ((lastData = data.Length ()) + 1); 00083 created = true; 00084 nextShrink = frameNumber + 1; 00085 } 00086 } 00087 00088 // Conserve some memory 00089 if (!created && (frameNumber <= nextShrink)) 00090 { 00091 data.ShrinkBestFit (); 00092 } 00093 00094 FrameData& frameData = data[lastData]; 00095 frameData.lastFrame = frameNumber; 00096 return frameData.data; 00097 } 00098 00104 void Clear () 00105 { 00106 data.DeleteAll(); 00107 } 00108 }; 00109 00110 #endif // __CS_CSTOOL_FRAMEDATAHOLDER_H__
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