public int RenderPageToDeviceContext(IUnknown *pdfPage, ID2D1DeviceContext *pD2DDeviceContext, PDF_RENDER_PARAMS *pRenderParams)
 {
     return(((delegate * unmanaged <IPdfRendererNative *, IUnknown *, ID2D1DeviceContext *, PDF_RENDER_PARAMS *, int>)(lpVtbl[4]))((IPdfRendererNative *)Unsafe.AsPointer(ref this), pdfPage, pD2DDeviceContext, pRenderParams));
 }
 public int RenderPageToSurface(IUnknown *pdfPage, IDXGISurface *pSurface, POINT offset, PDF_RENDER_PARAMS *pRenderParams)
 {
     return(((delegate * unmanaged <IPdfRendererNative *, IUnknown *, IDXGISurface *, POINT, PDF_RENDER_PARAMS *, int>)(lpVtbl[3]))((IPdfRendererNative *)Unsafe.AsPointer(ref this), pdfPage, pSurface, offset, pRenderParams));
 }