Re: [1/5] windowscodecs: Implement IWICStream::InitializeFromIStream.

[Vincent Povirk]

> +static HRESULT WINAPI StreamOnStream_Seek(IStream *iface,
> - LARGE_INTEGER dlibMove, DWORD dwOrigin, ULARGE_INTEGER *plibNewPosition)
>
> +{
> - StreamOnStream *This = StreamOnStream_from_IStream(iface);
> - HRESULT hr=S_OK;
> - TRACE("(%p)\n", This);
> -
> - EnterCriticalSection(&This->lock);
> - hr = IStream_Seek(This->stream, dlibMove, dwOrigin, plibNewPosition);
> - LeaveCriticalSection(&This->lock);
> -
> - return hr;
>
> +}

The IWICStream needs to have an independent position from the underlying stream.

Also, why not just forward to InitializeFromIStreamRegion?