/// <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;
}
/// <summary>
/// Add all inheritable values from the specified page to the specified values structure.
/// </summary>
internal static void InheritValues(PdfDictionary page, ref InheritedValues values)
{
PdfItem item = page.Elements[InheritablePageKeys.Resources];
if (item != null)
{
PdfReference reference = item as PdfReference;
if (reference != null)
{
values.Resources = (PdfDictionary)(reference.Value);
}
else
{
values.Resources = (PdfDictionary)item;
}
}
item = page.Elements[InheritablePageKeys.MediaBox];
if (item != null)
{
values.MediaBox = new PdfRectangle(item);
}
item = page.Elements[InheritablePageKeys.CropBox];
if (item != null)
{
values.CropBox = new PdfRectangle(item);
}
item = page.Elements[InheritablePageKeys.Rotate];
if (item != null)
{
if (item is PdfReference)
{
item = ((PdfReference)item).Value;
}
values.Rotate = (PdfInteger)item;
}
}
internal override void WriteObject(PdfWriter writer)
{
// HACK: temporarily flip media box if Landscape
PdfRectangle mediaBox = MediaBox;
// TODO: Take /Rotate into account
if (_orientation == PageOrientation.Landscape)
MediaBox = new PdfRectangle(mediaBox.X1, mediaBox.Y1, mediaBox.Y2, mediaBox.X2);
#if true
// Add transparency group to prevent rendering problems of Adobe viewer.
// Update (PDFsharp 1.50 beta 3): Add transparency group only of ColorMode is defined.
// Rgb is the default for the ColorMode, but if user sets it to Undefined then
// we respect this and skip the transparency group.
TransparencyUsed = true; // TODO: check XObjects
if (TransparencyUsed && !Elements.ContainsKey(Keys.Group) &&
_document.Options.ColorMode != PdfColorMode.Undefined)
{
PdfDictionary group = new PdfDictionary();
_elements["/Group"] = group;
if (_document.Options.ColorMode != PdfColorMode.Cmyk)
group.Elements.SetName("/CS", "/DeviceRGB");
else
group.Elements.SetName("/CS", "/DeviceCMYK");
group.Elements.SetName("/S", "/Transparency");
//False is default: group.Elements["/I"] = new PdfBoolean(false);
//False is default: group.Elements["/K"] = new PdfBoolean(false);
}
#endif
#if DEBUG_
PdfItem item = Elements["/MediaBox"];
if (item != null)
item.GetType();
#endif
base.WriteObject(writer);
if (_orientation == PageOrientation.Landscape)
MediaBox = mediaBox;
}
/// <summary>
/// Initializes a new instance of the PdfRectangle class with the specified PdfArray.
/// </summary>
internal PdfRectangle(PdfItem item)
{
if (item == null || item is PdfNull)
{
return;
}
if (item is PdfReference)
{
item = ((PdfReference)item).Value;
}
PdfArray array = item as PdfArray;
if (array == null)
{
throw new InvalidOperationException(PSSR.UnexpectedTokenInPdfFile);
}
_x1 = array.Elements.GetReal(0);
_y1 = array.Elements.GetReal(1);
_x2 = array.Elements.GetReal(2);
_y2 = array.Elements.GetReal(3);
}
/// <summary>
/// Replace all indirect references to external objects by their cloned counterparts
/// owned by the importer document.
/// </summary>
static void FixUpObject(PdfImportedObjectTable iot, PdfDocument owner, PdfObject value)
{
Debug.Assert(ReferenceEquals(iot.Owner, owner));
PdfDictionary dict;
PdfArray array;
if ((dict = value as PdfDictionary) != null)
{
// Case: The object is a dictionary.
// Set document for cloned direct objects.
if (dict.Owner == null)
{
// If the dictionary has not yet an owner set the owner to the importing document.
dict.Document = owner;
}
else
{
// If the dictionary already has an owner it must be the importing document.
Debug.Assert(dict.Owner == owner);
}
// Search for indirect references in all dictionary elements.
PdfName[] names = dict.Elements.KeyNames;
foreach (PdfName name in names)
{
PdfItem item = dict.Elements[name];
Debug.Assert(item != null, "A dictionary element cannot be null.");
// Is item an iref?
PdfReference iref = item as PdfReference;
if (iref != null)
{
// Case: The item is a reference.
// Does the iref already belongs to the new owner?
if (iref.Document == owner)
{
// Yes: fine. Happens when an already cloned object is reused.
continue;
}
//Debug.Assert(iref.Document == iot.Document);
// No: Replace with iref of cloned object.
PdfReference newXRef = iot[iref.ObjectID]; // TODO: Explain this line of code in all details.
Debug.Assert(newXRef != null);
Debug.Assert(newXRef.Document == owner);
dict.Elements[name] = newXRef;
}
else
{
// Case: The item is not a reference.
// If item is an object recursively fix its inner items.
PdfObject pdfObject = item as PdfObject;
if (pdfObject != null)
{
// Fix up inner objects, i.e. recursively walk down the object tree.
FixUpObject(iot, owner, pdfObject);
}
else
{
// The item is something else, e.g. a name.
// Nothing to do.
// ...but let's double check this case in DEBUG build.
DebugCheckNonObjects(item);
}
}
}
}
else if ((array = value as PdfArray) != null)
{
// Case: The object is an array.
// Set document for cloned direct objects.
if (array.Owner == null)
{
// If the array has not yet an owner set the owner to the importing document.
array.Document = owner;
}
else
{
// If the array already has an owner it must be the importing document.
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];
Debug.Assert(item != null, "An array element cannot be null.");
// Is item an iref?
PdfReference iref = item as PdfReference;
if (iref != null)
{
// Case: The item is a reference.
// Does the iref already belongs to the owner?
if (iref.Document == owner)
{
// Yes: fine. Happens when an already cloned object is reused.
continue;
}
// No: replace with iref of cloned object.
Debug.Assert(iref.Document == iot.ExternalDocument);
PdfReference newXRef = iot[iref.ObjectID];
Debug.Assert(newXRef != null);
Debug.Assert(newXRef.Document == owner);
array.Elements[idx] = newXRef;
}
else
{
// Case: The item is not a reference.
// If item is an object recursively fix its inner items.
PdfObject pdfObject = item as PdfObject;
if (pdfObject != null)
{
// Fix up inner objects, i.e. recursively walk down the object tree.
FixUpObject(iot, owner, pdfObject);
}
else
{
// The item is something else, e.g. a name.
// Nothing to do.
// ...but let's double check this case in DEBUG build.
DebugCheckNonObjects(item);
}
}
}
}
else
{
// Case: The item is some other indirect object.
// Indirect integers, booleans, etc. are allowed, but PDFsharp do not create them.
// If such objects occur in imported PDF files from other producers, nothing more is to do.
// The owner was already set, which is double checked by the assertions below.
if (value is PdfNameObject || value is PdfStringObject || value is PdfBooleanObject || value is PdfIntegerObject || value is PdfNumberObject)
{
Debug.Assert(value.IsIndirect);
Debug.Assert(value.Owner == owner);
}
else
{
Debug.Assert(false, "Should not come here. Object is neither a dictionary nor an array.");
}
}
}
/// <summary>
/// Initializes this instance from an exisiting PDF document.
/// </summary>
void Initialize()
{
string title;
if (Elements.TryGetString(Keys.Title, out title))
{
Title = title;
}
PdfReference parentRef = Elements.GetReference(Keys.Parent);
if (parentRef != null)
{
PdfOutline parent = parentRef.Value as PdfOutline;
if (parent != null)
{
Parent = parent;
}
}
Count = Elements.GetInteger(Keys.Count);
PdfArray colors = Elements.GetArray(Keys.C);
if (colors != null && colors.Elements.Count == 3)
{
double r = colors.Elements.GetReal(0);
double g = colors.Elements.GetReal(1);
double b = colors.Elements.GetReal(2);
TextColor = XColor.FromArgb((int)(r * 255), (int)(g * 255), (int)(b * 255));
}
// Style directly works on dictionary element.
PdfItem dest = Elements.GetValue(Keys.Dest);
PdfItem a = Elements.GetValue(Keys.A);
Debug.Assert(dest == null || a == null, "Either destination or goto action.");
if (dest != null)
{
if (dest is PdfArray destArray)
{
SplitDestinationPage(destArray);
}
else
{
Debug.Assert(false, "See what to do when this happened.");
}
}
else if (a != null)
{
// The dictionary should be a GoTo action.
PdfDictionary action = a as PdfDictionary;
if (action != null && action.Elements.GetName(PdfAction.Keys.S) == "/GoTo")
{
dest = action.Elements[PdfGoToAction.Keys.D];
if (dest is PdfArray destArray)
{
// Replace Action with /Dest entry.
Elements.Remove(Keys.A);
Elements.Add(Keys.Dest, destArray);
SplitDestinationPage(destArray);
}
else if (dest is PdfReference detRef)
{
// Replace Action with /Dest entry.
Elements.Remove(Keys.A);
Elements.Add(Keys.Dest, detRef.Value);
SplitDestinationPage((PdfArray)detRef.Value);
}
else
{
throw new Exception("Destination Array expected.");
}
}
else
{
Debug.Assert(false, "See what to do when this happened.");
}
}
else
{
// Neither destination page nor GoTo action.
}
InitializeChildren();
}