private PDFCosDictionary CopyResources(PDFCosDictionary resourcesDict)
{
PDFCosDictionary copy = new PDFCosDictionary();
copy[PDFNames.XObject] = Copy(resourcesDict[PDFNames.XObject] as PDFCosDictionary);
copy[PDFNames.Font] = Copy(resourcesDict[PDFNames.Font] as PDFCosDictionary);
copy[PDFNames.ColorSpace] = Copy(resourcesDict[PDFNames.ColorSpace] as PDFCosDictionary);
copy[PDFNames.Pattern] = Copy(resourcesDict[PDFNames.Pattern] as PDFCosDictionary);
copy[PDFNames.Shading] = resourcesDict[PDFNames.Shading] as PDFCosDictionary;
copy[PDFNames.Properties] = resourcesDict[PDFNames.Properties] as PDFCosDictionary;
copy[PDFNames.ProcSet] = resourcesDict[PDFNames.ProcSet] as PDFCosArray;
return(copy);
}
protected override void CleanUp()
{
base.CleanUp();
PDFCosDictionary resourcesDict = this.Context.ContentStreamContainer[PDFNames.Resources] as PDFCosDictionary;
if (resourcesDict != null)
{
resourcesDict = CopyResources(resourcesDict);
CleanUpResources(resourcesDict[PDFNames.ColorSpace] as PDFCosDictionary, colorspaces);
CleanUpResources(resourcesDict[PDFNames.XObject] as PDFCosDictionary, xObjects);
CleanUpResources(resourcesDict[PDFNames.Font] as PDFCosDictionary, fonts);
CleanUpResources(resourcesDict[PDFNames.Pattern] as PDFCosDictionary, patterns);
this.Context.ContentStreamContainer[PDFNames.Resources] = resourcesDict;
}
}
private PDFCosDictionary Copy(PDFCosDictionary dict)
{
if (dict == null)
{
return(null);
}
PDFCosDictionary copy = new PDFCosDictionary();
string[] keys = dict.Keys;
foreach (string key in keys)
{
copy[key] = dict[key];
}
return(copy);
}
private void CleanUpResources(PDFCosDictionary resourcesDict, HashSet <string> usedResources)
{
if (resourcesDict == null)
{
return;
}
string[] keys = resourcesDict.Keys;
foreach (string key in keys)
{
// The resources dictionary contains a key that is not used, remove it.
if (!usedResources.Contains(key))
{
resourcesDict[key] = null;
}
}
}
