public void DetachDocument(PDFDocument.DocumentHandle handle)
{
if (handle.IsAlive)
{
foreach (Selector selector in _forms.Keys)
{
PDFImportedObjectTable table = _forms[selector];
if (table.ExternalDocument != null && table.ExternalDocument.Handle == handle)
{
_forms.Remove(selector);
break;
}
}
}
// Clean table
bool itemRemoved = true;
while (itemRemoved)
{
itemRemoved = false;
foreach (Selector selector in _forms.Keys)
{
PDFImportedObjectTable table = _forms[selector];
if (table.ExternalDocument == null)
{
_forms.Remove(selector);
itemRemoved = true;
break;
}
}
}
}
/// <summary>
/// Gets the imported object table.
/// </summary>
public PDFImportedObjectTable GetImportedObjectTable(PDFPage page)
{
// Is the external PDF file from which is imported already known for the current document?
Selector selector = new Selector(page);
if (!_forms.TryGetValue(selector, out PDFImportedObjectTable importedObjectTable))
{
importedObjectTable = new PDFImportedObjectTable(Owner, page.Owner);
_forms[selector] = importedObjectTable;
}
return(importedObjectTable);
}
/// <summary>
/// Gets the imported object table.
/// </summary>
public PDFImportedObjectTable GetImportedObjectTable(PDFDocument document)
{
if (document == null)
{
throw new ArgumentNullException("document");
}
// Is the external PDF file from which is imported already known for the current document?
Selector selector = new Selector(document);
if (!_forms.TryGetValue(selector, out PDFImportedObjectTable importedObjectTable))
{
// Create new table for document.
importedObjectTable = new PDFImportedObjectTable(Owner, document);
_forms[selector] = importedObjectTable;
}
return(importedObjectTable);
}
/// <summary>
/// Gets a PDFFormXObject from an XPDFForm. Because the returned objects must be unique, always
/// a new instance of PDFFormXObject is created if none exists for the specified form.
/// </summary>
public PDFFormXObject GetForm(XForm form)
{
// If the form already has a PDFFormXObject, return it.
if (form._pdfForm != null)
{
Debug.Assert(form.IsTemplate, "An XPDFForm must not have a PDFFormXObject.");
if (ReferenceEquals(form._pdfForm.Owner, Owner))
{
return(form._pdfForm);
}
//throw new InvalidOperationException("Because of a current limitation of PDFSharp an XPDFForm object can be used only within one single PDFDocument.");
// Dispose PDFFromXObject when document has changed
form._pdfForm = null;
}
if (form is XPDFForm pdfForm)
{
// Is the external PDF file from which is imported already known for the current document?
Selector selector = new Selector(form);
if (!_forms.TryGetValue(selector, out PDFImportedObjectTable importedObjectTable))
{
// No: Get the external document from the form and create ImportedObjectTable.
PDFDocument doc = pdfForm.ExternalDocument;
importedObjectTable = new PDFImportedObjectTable(Owner, doc);
_forms[selector] = importedObjectTable;
}
PDFFormXObject xObject = importedObjectTable.GetXObject(pdfForm.PageNumber);
if (xObject == null)
{
xObject = new PDFFormXObject(Owner, importedObjectTable, pdfForm);
importedObjectTable.SetXObject(pdfForm.PageNumber, xObject);
}
return(xObject);
}
Debug.Assert(form.GetType() == typeof(XForm));
form._pdfForm = new PDFFormXObject(Owner, form);
return(form._pdfForm);
}
internal PDFFormXObject(PDFDocument thisDocument, PDFImportedObjectTable importedObjectTable, XPDFForm form)
: base(thisDocument)
{
Debug.Assert(importedObjectTable != null);
Debug.Assert(ReferenceEquals(thisDocument, importedObjectTable.Owner));
Elements.SetName(Keys.Type, "/XObject");
Elements.SetName(Keys.Subtype, "/Form");
if (form.IsTemplate)
{
Debug.Assert(importedObjectTable == null);
// TODO more initialization here???
return;
}
XPDFForm pdfForm = form;
// Get import page
PDFPages importPages = importedObjectTable.ExternalDocument.Pages;
if (pdfForm.PageNumber < 1 || pdfForm.PageNumber > importPages.Count)
{
PSSR.ImportPageNumberOutOfRange(pdfForm.PageNumber, importPages.Count, form._path);
}
PDFPage importPage = importPages[pdfForm.PageNumber - 1];
// Import resources
PDFItem res = importPage.Elements["/Resources"];
if (res != null) // unlikely but possible
{
#if true
// Get root object
PDFObject root = res is PDFReference ? ((PDFReference)res).Value : (PDFDictionary)res;
root = ImportClosure(importedObjectTable, thisDocument, root);
// If the root was a direct object, make it indirect.
if (root.Reference == null)
{
thisDocument.IrefTable.Add(root);
}
Debug.Assert(root.Reference != null);
Elements["/Resources"] = root.Reference;
#else
// Get transitive closure
PDFObject[] resources = importPage.Owner.Internals.GetClosure(resourcesRoot);
int count = resources.Length;
#if DEBUG_
for (int idx = 0; idx < count; idx++)
{
Debug.Assert(resources[idx].XRef != null);
Debug.Assert(resources[idx].XRef.Document != null);
Debug.Assert(resources[idx].Document != null);
if (resources[idx].ObjectID.ObjectNumber == 12)
{
GetType();
}
}
#endif
// 1st step. Already imported objects are reused and new ones are cloned.
for (int idx = 0; idx < count; idx++)
{
PDFObject obj = resources[idx];
if (importedObjectTable.Contains(obj.ObjectID))
{
// external object was already imported
PDFReference iref = importedObjectTable[obj.ObjectID];
Debug.Assert(iref != null);
Debug.Assert(iref.Value != null);
Debug.Assert(iref.Document == Owner);
// replace external object by the already clone counterpart
resources[idx] = iref.Value;
}
else
{
// External object was not imported earlier and must be cloned
PDFObject clone = obj.Clone();
Debug.Assert(clone.Reference == null);
clone.Document = Owner;
if (obj.Reference != null)
{
// add it to this (the importer) document
Owner.irefTable.Add(clone);
Debug.Assert(clone.Reference != null);
// save old object identifier
importedObjectTable.Add(obj.ObjectID, clone.Reference);
//Debug.WriteLine("Cloned: " + obj.ObjectID.ToString());
}
else
{
// The root object (the /Resources value) is not an indirect object
Debug.Assert(idx == 0);
// add it to this (the importer) document
Owner.irefTable.Add(clone);
Debug.Assert(clone.Reference != null);
}
// replace external object by its clone
resources[idx] = clone;
}
}
#if DEBUG_
for (int idx = 0; idx < count; idx++)
{
Debug.Assert(resources[idx].XRef != null);
Debug.Assert(resources[idx].XRef.Document != null);
Debug.Assert(resources[idx].Document != null);
if (resources[idx].ObjectID.ObjectNumber == 12)
{
GetType();
}
}
#endif
// 2nd step. Fix up indirect references that still refers to the import document.
for (int idx = 0; idx < count; idx++)
{
PDFObject obj = resources[idx];
Debug.Assert(obj.Owner != null);
FixUpObject(importedObjectTable, importedObjectTable.Owner, obj);
}
// Set resources key to the root of the clones
Elements["/Resources"] = resources[0].Reference;
#endif
}
// Take /Rotate into account.
PDFRectangle rect = importPage.Elements.GetRectangle(PDFPage.InheritablePageKeys.MediaBox);
// Reduce rotation to 0, 90, 180, or 270.
int rotate = (importPage.Elements.GetInteger(PDFPage.InheritablePageKeys.Rotate) % 360 + 360) % 360;
//rotate = 0;
if (rotate == 0)
{
// Set bounding box to media box.
Elements["/BBox"] = rect;
}
else
{
// TODO: Have to adjust bounding box? (I think not, but I'm not sure -> wait for problem)
Elements["/BBox"] = rect;
// Rotate the image such that it is upright.
XMatrix matrix = new XMatrix();
double width = rect.Width;
double height = rect.Height;
matrix.RotateAtPrepend(-rotate, new XPoint(width / 2, height / 2));
// Translate the image such that its center lies on the center of the rotated bounding box.
double offset = (height - width) / 2;
if (rotate == 90)
{
// TODO It seems we can simplify this as the sign of offset changes too.
if (height > width)
{
matrix.TranslatePrepend(offset, offset); // Tested.
}
else
{
matrix.TranslatePrepend(offset, offset); // TODO Test case.
}
}
else if (rotate == 270)
{
// TODO It seems we can simplify this as the sign of offset changes too.
if (height > width)
{
matrix.TranslatePrepend(-offset, -offset); // Tested.
}
else
{
matrix.TranslatePrepend(-offset, -offset); // Tested.
}
}
//string item = "[" + PDFEncoders.ToString(matrix) + "]";
//Elements[Keys.Matrix] = new PDFLiteral(item);
Elements.SetMatrix(Keys.Matrix, matrix);
}
// Preserve filter because the content keeps unmodified.
PDFContent content = importPage.Contents.CreateSingleContent();
#if !DEBUG
content.Compressed = true;
#endif
PDFItem filter = content.Elements["/Filter"];
if (filter != null)
{
Elements["/Filter"] = filter.Clone();
}
// (no cloning needed because the bytes keep untouched)
Stream = content.Stream; // new PDFStream(bytes, this);
Elements.SetInteger("/Length", content.Stream.Value.Length);
}
/// <summary>
/// Replace all indirect references to external objects by their cloned counterparts
/// owned by the importer document.
/// </summary>
void FixUpObject_old(PDFImportedObjectTable iot, PDFObject value)
{
// TODO: merge with PDFXObject.FixUpObject
PDFDictionary dict;
PDFArray array;
if ((dict = value as PDFDictionary) != null)
{
// Set document for cloned direct objects
if (dict.Owner == null)
{
dict.Document = Owner;
}
else
{
Debug.Assert(dict.Owner == Owner);
}
// Search for indirect references in all keys
PDFName[] names = dict.Elements.KeyNames;
foreach (PDFName name in names)
{
PDFItem item = dict.Elements[name];
// Is item an iref?
PDFReference iref = item as PDFReference;
if (iref != null)
{
// Does the iref already belong to this document?
if (iref.Document == Owner)
{
// Yes: fine
continue;
}
else
{
Debug.Assert(iref.Document == iot.ExternalDocument);
// No: replace with iref of cloned object
PDFReference newXRef = iot[iref.ObjectID];
Debug.Assert(newXRef != null);
Debug.Assert(newXRef.Document == Owner);
dict.Elements[name] = newXRef;
}
}
else if (item is PDFObject)
{
// Fix up inner objects
FixUpObject_old(iot, (PDFObject)item);
}
}
}
else if ((array = value as PDFArray) != null)
{
// Set document for cloned direct objects
if (array.Owner == null)
{
array.Document = Owner;
}
else
{
Debug.Assert(array.Owner == Owner);
}
// Search for indirect references in all array elements
int count = array.Elements.Count;
for (int idx = 0; idx < count; idx++)
{
PDFItem item = array.Elements[idx];
// Is item an iref?
PDFReference iref = item as PDFReference;
if (iref != null)
{
// Does the iref belongs to this document?
if (iref.Document == Owner)
{
// Yes: fine
continue;
}
else
{
Debug.Assert(iref.Document == iot.ExternalDocument);
// No: replace with iref of cloned object
PDFReference newXRef = iot[iref.ObjectID];
Debug.Assert(newXRef != null);
Debug.Assert(newXRef.Document == Owner);
array.Elements[idx] = newXRef;
}
}
else if (item is PDFObject)
{
// Fix up inner objects
FixUpObject_old(iot, (PDFObject)item);
}
}
}
}