thumbnail_handler.h

// Desktop Integration
// Copyright (C) 2017  David Capello
//
// This file is released under the terms of the MIT license.
// Read LICENSE.txt for more information.

#ifndef DESKTOP_THUMBNAIL_HANDLER_H_INCLUDED
#define DESKTOP_THUMBNAIL_HANDLER_H_INCLUDED

#include "base/win/comptr.h"

#include <propsys.h>
#include <thumbcache.h>

namespace desktop {

class ThumbnailHandler : public IInitializeWithStream,
                         public IThumbnailProvider {
public:
  static HRESULT CreateInstance(REFIID riid, void** ppvObject);

  // IUnknown
  IFACEMETHODIMP QueryInterface(REFIID riid, void** ppv);
  IFACEMETHODIMP_(ULONG) AddRef();
  IFACEMETHODIMP_(ULONG) Release();

  // IInitializeWithStream
  IFACEMETHODIMP Initialize(IStream* pStream, DWORD grfMode);

  // IThumbnailProvider
  IFACEMETHODIMP GetThumbnail(UINT cx, HBITMAP* phbmp, WTS_ALPHATYPE* pdwAlpha);

private:
  ThumbnailHandler();
  virtual ~ThumbnailHandler();

  long m_ref;
  base::ComPtr<IStream> m_stream;
};

} // namespace desktop

#endif