/// <summary>
/// Prepends a new content stream and returns it.
/// </summary>
public PdfContent PrependContent()
{
Debug.Assert(Owner != null);
SetModified();
PdfContent content = new PdfContent(Owner);
Owner._irefTable.Add(content);
Debug.Assert(content.Reference != null);
Elements.Insert(0, content.Reference);
return(content);
}
/// <summary>
/// Replaces the current content of the page with the specified bytes.
/// </summary>
PdfContent ReplaceContent(byte[] contentBytes)
{
Debug.Assert(Owner != null);
PdfContent content = new PdfContent(Owner);
content.CreateStream(contentBytes);
Owner._irefTable.Add(content);
Elements.Clear();
Elements.Add(content.Reference);
return(content);
}
void SetModified()
{
if (!_modified)
{
_modified = true;
int count = Elements.Count;
if (count == 1)
{
PdfContent content = (PdfContent)((PdfReference)Elements[0]).Value;
content.PreserveGraphicsState();
}
else if (count > 1)
{
// Surround content streams with q/Q operations
byte[] value;
int length;
PdfContent content = (PdfContent)((PdfReference)Elements[0]).Value;
if (content != null && content.Stream != null)
{
length = content.Stream.Length;
value = new byte[length + 2];
value[0] = (byte)'q';
value[1] = (byte)'\n';
Array.Copy(content.Stream.Value, 0, value, 2, length);
content.Stream.Value = value;
content.Elements.SetInteger("/Length", length + 2);
}
content = (PdfContent)((PdfReference)Elements[count - 1]).Value;
if (content != null && content.Stream != null)
{
length = content.Stream.Length;
value = new byte[length + 3];
Array.Copy(content.Stream.Value, 0, value, 0, length);
value[length] = (byte)' ';
value[length + 1] = (byte)'Q';
value[length + 2] = (byte)'\n';
content.Stream.Value = value;
content.Elements.SetInteger("/Length", length + 3);
}
}
}
}
/// <summary>
/// Creates a single content stream with the bytes from the array of the content streams.
/// This operation does not modify any of the content streams in this array.
/// </summary>
public PdfContent CreateSingleContent()
{
byte[] bytes = new byte[0];
byte[] bytes1;
byte[] bytes2;
foreach (PdfItem iref in Elements)
{
PdfDictionary cont = (PdfDictionary)((PdfReference)iref).Value;
bytes1 = bytes;
bytes2 = cont.Stream.UnfilteredValue;
bytes = new byte[bytes1.Length + bytes2.Length + 1];
bytes1.CopyTo(bytes, 0);
bytes[bytes1.Length] = (byte)'\n';
bytes2.CopyTo(bytes, bytes1.Length + 1);
}
PdfContent content = new PdfContent(Owner);
content.Stream = new PdfDictionary.PdfStream(bytes, content);
return(content);
}
internal PdfFormXObject(PdfDocument thisDocument, PdfImportedObjectTable importedObjectTable, XPdfForm form)
: base(thisDocument)
{
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;
}
Debug.Assert(importedObjectTable != null);
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;
if (res is PdfReference)
{
root = ((PdfReference)res).Value;
}
else
{
root = (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 ealier 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.Keys.MediaBox);
int rotate = importPage.Elements.GetInteger(PdfPage.Keys.Rotate);
//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 (height > width)
{
matrix.TranslatePrepend(offset, offset);
}
else
{
matrix.TranslatePrepend(-offset, -offset);
}
//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);
}