public void renderToHDC(IndigoObject obj, IntPtr hdc, bool printing)
{
_indigo.setSessionID();
int hdch = _indigo.checkResult(_renderer_lib.indigoRenderWriteHDC((void *)hdc, printing ? 1 : 0));
_indigo.checkResult(_renderer_lib.indigoRender(obj.self, hdch));
}