[idd] driver: use the frameSize instead of the resource size

As the resource size can be larger then the actual frame data, we
need to track this seperately so that we don't waste cycles copying
data the client will never use.

idd/LGIdd/CSwapChainProcessor.cpp

@@ -217,7 +217,8 @@ void CSwapChainProcessor::SwapChainNewFrame(ComPtr<IDXGIResource> acquiredBuffer
   m_dx12Device->GetCopyQueue().Reset();
 
   if (m_dx12Device->IsIndirectCopy())
-    m_devContext->WriteFrameBuffer(fbRes->GetMap(), 0, fbRes->GetSize(), true);
+    m_devContext->WriteFrameBuffer(
+      fbRes->GetMap(), 0, fbRes->GetFrameSize(), true);
   else
     m_devContext->FinalizeFrameBuffer();
 }