/// <summary>
/// Adds the specified graphics state to this resource dictionary
/// and returns its local resource name.
/// </summary>
public string AddExtGState(PDFExtGState extGState)
{
if (!_resources.TryGetValue(extGState, out string name))
{
name = NextExtGStateName;
_resources[extGState] = name;
if (extGState.Reference == null)
{
Owner.IrefTable.Add(extGState);
}
ExtGStates.Elements[name] = extGState.Reference;
}
return(name);
}
/// <summary>
/// Gets a PDFExtGState with the key 'CA' set to the specified alpha value.
/// </summary>
public PDFExtGState GetExtGStateStroke(double alpha, bool overprint)
{
string key = PDFExtGState.MakeKey(alpha, overprint);
if (!_strokeAlphaValues.TryGetValue(key, out PDFExtGState extGState))
{
extGState = new PDFExtGState(Owner)
{
//extGState.Elements[PDFExtGState.Keys.CA] = new PDFReal(alpha);
StrokeAlpha = alpha
};
if (overprint)
{
extGState.StrokeOverprint = true;
extGState.Elements.SetInteger(PDFExtGState.Keys.OPM, 1);
}
_strokeAlphaValues[key] = extGState;
}
return(extGState);
}