BUG: VirtualWriter was propagating an empty region (as the ImageFileWriter before)

Code/IO/otbStreamingImageVirtualWriter.h

@@ -132,6 +132,10 @@ public:
    *   Setting the availableRAM parameter to 0 means that the available RAM
    *   is set from the CMake configuration option */
   void SetAutomaticAdaptativeStreaming(unsigned int availableRAM = 0, double bias = 1.0);
+  
+  /** Override Update() from ProcessObject 
+   *  This filter does not produce an output */
+  virtual void Update();
 
 protected:
   StreamingImageVirtualWriter();

Code/IO/otbStreamingImageVirtualWriter.txx

@@ -146,6 +146,16 @@ StreamingImageVirtualWriter<TInputImage>
   m_StreamingManager = streamingManager;
 }
 
+template <class TInputImage>
+void
+StreamingImageVirtualWriter<TInputImage>
+::Update()
+{
+  InputImagePointer inputPtr = const_cast<InputImageType *>(this->GetInput(0));
+  inputPtr->UpdateOutputInformation();
+  
+  this->GenerateData();
+}
 
 template <class TInputImage>
 void
@@ -231,9 +241,12 @@ StreamingImageVirtualWriter<TInputImage>
     {
     streamRegion = m_StreamingManager->GetSplit(m_CurrentDivision);
     otbMsgDevMacro(<< "Processing region : " << streamRegion )
-    inputPtr->ReleaseData();
+    //inputPtr->ReleaseData();
+    //inputPtr->SetRequestedRegion(streamRegion);
+    //inputPtr->Update();
     inputPtr->SetRequestedRegion(streamRegion);
-    inputPtr->Update();
+    inputPtr->PropagateRequestedRegion();
+    inputPtr->UpdateOutputData();
     }
 
   /**