/// <summary>
/// Helper function for ImportExternalPage.
/// </summary>
void CloneElement(PdfPage page, PdfPage importPage, string key, bool deepcopy)
{
Debug.Assert(page != null);
Debug.Assert(page.Owner == _document);
Debug.Assert(importPage.Owner != null);
Debug.Assert(importPage.Owner != _document);
PdfItem item = importPage.Elements[key];
if (item != null)
{
PdfImportedObjectTable importedObjectTable = null;
if (!deepcopy)
{
importedObjectTable = Owner.FormTable.GetImportedObjectTable(importPage);
}
// The item can be indirect. If so, replace it by its value.
if (item is PdfReference)
{
item = ((PdfReference)item).Value;
}
if (item is PdfObject)
{
PdfObject root = (PdfObject)item;
if (deepcopy)
{
Debug.Assert(root.Owner != null, "See 'else' case for details");
root = DeepCopyClosure(_document, root);
}
else
{
// The owner can be null if the item is not a reference.
if (root.Owner == null)
{
root.Document = importPage.Owner;
}
root = ImportClosure(importedObjectTable, page.Owner, root);
}
if (root.Reference == null)
{
page.Elements[key] = root;
}
else
{
page.Elements[key] = root.Reference;
}
}
else
{
// Simple items are just cloned.
page.Elements[key] = item.Clone();
}
}
}
/// <summary>
/// Inherit values from parent node.
/// </summary>
internal static void InheritValues(PdfDictionary page, InheritedValues values)
{
// HACK: I'M ABSOLUTELY NOT SURE WHETHER THIS CODE COVERS ALL CASES.
if (values.Resources != null)
{
PdfDictionary resources;
PdfItem res = page.Elements[InheritablePageKeys.Resources];
if (res is PdfReference)
{
resources = (PdfDictionary)((PdfReference)res).Value.Clone();
resources.Document = page.Owner;
}
else
{
resources = (PdfDictionary)res;
}
if (resources == null)
{
resources = values.Resources.Clone();
resources.Document = page.Owner;
page.Elements.Add(InheritablePageKeys.Resources, resources);
}
else
{
foreach (PdfName name in values.Resources.Elements.KeyNames)
{
if (!resources.Elements.ContainsKey(name.Value))
{
PdfItem item = values.Resources.Elements[name];
if (item is PdfObject)
{
item = item.Clone();
}
resources.Elements.Add(name.ToString(), item);
}
}
}
}
if (values.MediaBox != null && page.Elements[InheritablePageKeys.MediaBox] == null)
{
page.Elements[InheritablePageKeys.MediaBox] = values.MediaBox;
}
if (values.CropBox != null && page.Elements[InheritablePageKeys.CropBox] == null)
{
page.Elements[InheritablePageKeys.CropBox] = values.CropBox;
}
if (values.Rotate != null && page.Elements[InheritablePageKeys.Rotate] == null)
{
page.Elements[InheritablePageKeys.Rotate] = values.Rotate;
}
}