LImageViewerCell::EnableLowMemoryUsageCallBack

#ifdef LImageViewerChild  
class LImageViewerChild :public LImageViewerCell 
{ 
   virtual L_INT FramesRequestedCallBack (L_INT    nCellIndex, 
                                          L_UINT * puFramesRequested, 
                                          L_UINT   uLength); 
}; 
#endif 
 
L_INT LImageViewerChild::FramesRequestedCallBack (L_INT    nCellIndex, 
                               L_UINT * puFramesRequested, 
                               L_UINT   uLength) 
{ 
   UNREFERENCED_PARAMETER(nCellIndex); 
   L_INT nI; 
   LOADFILEOPTION LoadOption; 
   BITMAPHANDLE * pBitmap; 
   LBitmap        BitmapHandles; 
   pBITMAPHANDLE  pBitmapHandle; 
 
   if (uLength == 0) 
      return 0; 
 
   LBaseFile::GetDefaultLoadFileOption(&LoadOption, sizeof(LOADFILEOPTION)); 
 
   pBitmap = (pBITMAPHANDLE)malloc(sizeof(BITMAPHANDLE) * uLength); 
 
   for (nI = 0; nI < (L_INT)uLength; nI++) 
   { 
      LoadOption.PageNumber = puFramesRequested[nI]; 
      BitmapHandles.Load(MAKE_IMAGE_PATH(TEXT("image1.dcm")), 0, ORDER_BGRORGRAY, &LoadOption, NULL); 
 
      pBitmapHandle = BitmapHandles.GetHandle(); 
 
      memcpy(&pBitmap[nI], pBitmapHandle, sizeof(BITMAPHANDLE)); 
      BitmapHandles.SetHandle(NULL, FALSE); 
   } 
 
   SetRequestedImage(pBitmap, (L_INT *) puFramesRequested, uLength, 0); 
   return SUCCESS; 
} 
 
L_INT LImageViewer_EnableCellLowMemoryUsageExample(LImageViewer& ImageViewer) 
{ 
   FILEINFO                 FileInfo; 
   pDISPCONTAINERBITMAPINFO pBitmapInfo; 
   L_INT                    nI, nRet; 
   LBitmapBase             LeadBitmap; 
   LFile                  LeadFile; 
 
   LeadFile.SetBitmap(&LeadBitmap) ; 
   LeadFile.SetFileName(MAKE_IMAGE_PATH(TEXT("image1.dcm"))); 
 
   nRet = LeadFile.GetInfo(&FileInfo, sizeof(FILEINFO)) ; 
   if(nRet != SUCCESS) 
      return nRet; 
 
   pBitmapInfo = (DISPCONTAINERBITMAPINFO *)malloc(sizeof(DISPCONTAINERBITMAPINFO) * FileInfo.TotalPages); 
 
   for (nI = 0; nI < FileInfo.TotalPages; nI++) 
   { 
      pBitmapInfo[nI].uHeight = FileInfo.Height; 
      pBitmapInfo[nI].uWidth = FileInfo.Width; 
      pBitmapInfo[nI].uXResolution = FileInfo.XResolution; 
      pBitmapInfo[nI].uYResolution = FileInfo.YResolution; 
   } 
 
   LImageViewerCell * ImageViewerCell = new LImageViewerCell(); 
 
   ImageViewerCell->Create(ImageViewer.GetWindowHandle(0), 0); 
 
   ImageViewer.InsertCell(ImageViewerCell->GetWindowHandle(0), 0, 0); 
 
   ImageViewerCell->EnableLowMemoryUsageCallBack(TRUE); 
 
   ImageViewerCell->EnableCellLowMemoryUsage(0, 
                                             FileInfo.TotalPages, 
                                             pBitmapInfo, 
                                             0); 
 
   // invert all the frames in the cell. 
 
   for (nI = 0; nI < FileInfo.TotalPages; nI ++) 
   { 
      ImageViewerCell->InvertBitmap(nI, 0); 
   } 
 
   return SUCCESS; 
}