internal PdfObject[] AddSimpleExtGState(PdfDictionary gstate)
{
if (!documentExtGState.ContainsKey(gstate)) {
PdfWriter.CheckPdfIsoConformance(this, PdfIsoKeys.PDFISOKEY_GSTATE, gstate);
documentExtGState[gstate] = new PdfObject[]{new PdfName("GS" + (documentExtGState.Count + 1)), PdfIndirectReference};
}
return documentExtGState[gstate];
}