/// <summary>
/// Retrieves the specifed dictionary object as an object encoded with DCTDecode filter (JPEG).
/// </summary>
/// <param name="dictionary">The dictionary to extract the object from.</param>
/// <returns>The image retrieve from the dictionary. If not found or an invalid image, then null is returned.</returns>
private static Image ImageFromDCTDecode(PdfDictionary dictionary)
{
// DCTDecode a lossy filter based on the JPEG standard
// We can just load directly from the stream.
MemoryStream stream = new MemoryStream(dictionary.Stream.Value);
return (Bitmap.FromStream(stream));
}
static bool ExportImage(PdfDictionary image, ref int count)
{
bool ret = false;
try
{
string filter = image.Elements.GetName("/Filter");
switch (filter)
{
case "/DCTDecode":
ret = ExportJpegImage(image, ref count);
break;
/* case "/FlateDecode":
ExportAsPngImage(image, ref count);
break;*/
default:
ret = true;
break;
}
}
catch (Exception)//in case its an object array so we need first to decompress it
{
byte[] stream = image.Stream.Value;
PdfSharp.Pdf.Filters.FlateDecode aug = new PdfSharp.Pdf.Filters.FlateDecode();
stream = aug.Decode(stream);
ret = ExportJpegImage(stream, ref count);
}
return ret;
}
static void ExportJpegImage(PdfDictionary image, ref int count)
{
byte[] stream = image.Stream.Value;
using (FileStream fs = new FileStream(String.Format("Image{0}.jpg", count++), FileMode.Create, FileAccess.Write))
{
fs.Write(stream, 0, stream.Length);
}
}
internal PdfPage(PdfDictionary dict)
: base(dict)
{
// Set Orientation depending on /Rotate.
int rotate = Elements.GetInteger(InheritablePageKeys.Rotate);
if (Math.Abs((rotate / 90)) % 2 == 1)
_orientation = PageOrientation.Landscape;
}
/// <summary>
/// </summary>
public PdfContentWriter(DocumentRenderingContext context, PdfDictionary contentDictionary)
{
if (!(contentDictionary is IContentStream))
throw new ArgumentException("contentDictionary must implement IContentStream.");
this.context = context;
this.contentDictionary = contentDictionary;
this.contentStreamDictionary = (IContentStream)contentDictionary;
this.renderMode = RenderMode.Default;
//this.colorMode = page.document.Options.ColorMode;
//this.options = options;
this.content = new StringBuilder();
this.graphicsState = new PdfGraphicsState(this);
}
static void ExportImage(PdfDictionary image, ref int count)
{
string filter = image.Elements.GetName("/Filter");
switch (filter)
{
case "/DCTDecode":
ExportJpegImage(image, ref count);
break;
case "/FlateDecode":
ExportAsPngImage(image, ref count);
break;
}
}
static void ExportJpegImage(PdfDictionary image, ref int count)
{
// Fortunately JPEG has native support in PDF and exporting an image is just writing the stream to a file.
byte[] stream = image.Stream.Value;
FileStream fs = new FileStream(String.Format("F:\\Image{0}.jpeg", count++), FileMode.Create, FileAccess.Write);
BinaryWriter bw = new BinaryWriter(fs);
bw.Write(stream);
bw.Close();
}
public PdfCIDFont(PdfDocument document, PdfFontDescriptor fontDescriptor, byte[] fontData)
: base(document)
{
Elements.SetName(Keys.Type, "/Font");
Elements.SetName(Keys.Subtype, "/CIDFontType2");
PdfDictionary cid = new PdfDictionary();
cid.Elements.SetString("/Ordering", "Identity");
cid.Elements.SetString("/Registry", "Adobe");
cid.Elements.SetInteger("/Supplement", 0);
Elements.SetValue(Keys.CIDSystemInfo, cid);
this.fontDescriptor = fontDescriptor;
Owner.irefTable.Add(fontDescriptor);
Elements[Keys.FontDescriptor] = fontDescriptor.Reference;
FontEncoding = PdfFontEncoding.Unicode;
FontEmbedding = PdfFontEmbedding.Always;
}
static void ExportImage(PdfDictionary image, ref int count)
{
string filter = image.Elements.GetName(PdfImage.Keys.Filter);
switch (filter)
{
case "/DCTDecode":
ExportJpegImage(image, ref count);
break;
case "":
case "/FlateDecode":
ExportUnfilterableImage(image, ref count);
break;
case "/CCITTFaxDecode":
case "/RunLengthDecode,":
default:
throw new NotSupportedException();
}
}
public PdfCIDFont(PdfDocument document, PdfFontDescriptor fontDescriptor, XFont font)
: base(document)
{
Elements.SetName(Keys.Type, "/Font");
Elements.SetName(Keys.Subtype, "/CIDFontType2");
// This code is foobar. A PDF literal containing strings is not encrypted, but decryped when opening the PDF file.
//Elements.SetValue(Keys.CIDSystemInfo,
// new PdfLiteral("<< /Ordering (Identity) /Registry (Adobe) /Supplement 0>>"));
// Must use real objects because PDF literals containing strings is not encrypted. That causes an error
// when the file is decrypted.
PdfDictionary cid = new PdfDictionary();
cid.Elements.SetString("/Ordering", "Identity");
cid.Elements.SetString("/Registry", "Adobe");
cid.Elements.SetInteger("/Supplement", 0);
Elements.SetValue(Keys.CIDSystemInfo, cid);
this.fontDescriptor = fontDescriptor;
Owner.irefTable.Add(fontDescriptor);
Elements[Keys.FontDescriptor] = fontDescriptor.Reference;
FontEncoding = font.PdfOptions.FontEncoding;
FontEmbedding = font.PdfOptions.FontEmbedding;
}
PdfDictionary CreateDictionary(Type type, PdfDictionary oldDictionary)
{
ConstructorInfo ctorInfo;
PdfDictionary dict;
if (oldDictionary == null)
{
// Use contstructor with signature 'Ctor(PdfDocument owner)'.
ctorInfo = type.GetConstructor(BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic,
null, new Type[] { typeof(PdfDocument) }, null);
Debug.Assert(ctorInfo != null, "No appropriate constructor found for type: " + type.Name);
dict = ctorInfo.Invoke(new object[] { this.owner.Owner }) as PdfDictionary;
}
else
{
// Use contstructor with signature 'Ctor(PdfDictionary dict)'.
ctorInfo = type.GetConstructor(BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic,
null, new Type[] { typeof(PdfDictionary) }, null);
Debug.Assert(ctorInfo != null, "No appropriate constructor found for type: " + type.Name);
dict = ctorInfo.Invoke(new object[] { oldDictionary }) as PdfDictionary;
}
return dict;
}
/// <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;
}
}
/// <summary>
/// Initializes a new instance from an existing dictionary. Used for object type transformation.
/// </summary>
public PdfOutline(PdfDictionary dict)
: base(dict)
{
Initialize();
}
/// <summary>
/// Initializes a new instance of the <see cref="PdfAnnotation"/> class.
/// </summary>
internal PdfAnnotation(PdfDictionary dict)
: base(dict)
{
}
/// <summary>
/// Initializes the item based on the specified PdfDictionary.
/// </summary>
/// <param name="dictionary">The dictionary to use for initialization.</param>
private void Initialize(PdfDictionary dictionary)
{
if (dictionary == null) throw new ArgumentNullException("dictionary", "The PDF dictionary item to extract image meta data from was null.");
if (!dictionary.IsImage()) throw new ArgumentException("The specified dictionary does not represent an image.", "dictionary");
Height = dictionary.Elements.GetInteger("/Height");
Width = dictionary.Elements.GetInteger("/Width");
BitsPerPixel = dictionary.Elements.GetInteger("/BitsPerComponent");
Length = dictionary.Elements.GetInteger("/Length");
PdfItem colorSpace = null;
if (dictionary.Elements.TryGetValue("/ColorSpace", out colorSpace)) {
ColorSpace = PdfDictionaryColorSpace.Parse(colorSpace);
}
else ColorSpace = new PdfRGBColorSpace(); // Default to RGB Color Space
}
/// <summary>
/// Retrieves the specifed dictionary object as an object encoded with FlateDecode filter.
/// </summary>
/// <remarks>
/// FlateDecode a commonly used filter based on the zlib/deflate algorithm (a.k.a. gzip, but not zip)
/// defined in RFC 1950 and RFC 1951; introduced in PDF 1.2; it can use one of two groups of predictor
/// functions for more compact zlib/deflate compression: Predictor 2 from the TIFF 6.0 specification
/// and predictors (filters) from the PNG specification (RFC 2083)
/// </remarks>
/// <param name="dictionary">The dictionary to extract the object from.</param>
/// <returns>The image retrieve from the dictionary. If not found or an invalid image, then null is returned.</returns>
private static Image ImageFromFlateDecode(PdfDictionary dictionary)
{
PdfDictionaryImageMetaData imageData = new PdfDictionaryImageMetaData(dictionary);
// FlateDecode can be either indexed or a traditional ColorSpace
bool isIndexed = imageData.ColorSpace.IsIndexed;
PixelFormat format = GetPixelFormat(imageData.ColorSpace, imageData.BitsPerPixel, isIndexed);
Bitmap bitmap = new Bitmap(imageData.Width, imageData.Height, format);
// If indexed, retrieve and assign the color palette for the item.
if ((isIndexed) && (imageData.ColorSpace.IsRGB)) bitmap.Palette = ((PdfIndexedRGBColorSpace) imageData.ColorSpace).ToColorPalette();
else if (imageData.ColorSpace is PdfGrayColorSpace) bitmap.Palette = ((PdfGrayColorSpace)imageData.ColorSpace).ToColorPalette(imageData.BitsPerPixel);
// If not an indexed color, the .NET image component expects pixels to be in BGR order. However, our PDF stream is in RGB order.
byte[] stream = (format == PixelFormat.Format24bppRgb) ? ConvertRGBStreamToBGR(dictionary.Stream.UnfilteredValue) : dictionary.Stream.UnfilteredValue;
BitmapData bitmapData = bitmap.LockBits(new Rectangle(0, 0, imageData.Width, imageData.Height), ImageLockMode.WriteOnly, format);
// We can't just copy the bytes directly; the BitmapData .NET class has a stride (padding) associated with it.
int bitsPerPixel = ((((int)format >> 8) & 0xFF));
int length = (int)Math.Ceiling(bitmapData.Width * bitsPerPixel / 8.0);
for (int y = 0, height = bitmapData.Height; y < height; y++) {
int offset = y * length;
Marshal.Copy(stream, offset, bitmapData.Scan0 + (y * bitmapData.Stride), length);
}
bitmap.UnlockBits(bitmapData);
return (bitmap);
}
/// <summary>
/// Initializes a new instance of the <see cref="PdfContent"/> class.
/// </summary>
/// <param name="dict">The dict.</param>
public PdfContent(PdfDictionary dict) // HACK PdfContent
: base(dict)
{
// A PdfContent dictionary is always unfiltered.
Decode();
}
internal void SetOwner(PdfDictionary dict)
{
ChangeOwner(dict);
}
/// <summary>
/// Retrieves the specifed dictionary object as an object encoded with CCITTFaxDecode filter (TIFF).
/// </summary>
/// <param name="dictionary">The dictionary to extract the object from.</param>
/// <returns>The image retrieve from the dictionary. If not found or an invalid image, then null is returned.</returns>
private static Image ImageFromCCITTFaxDecode(PdfDictionary dictionary)
{
Image image = null;
PdfDictionaryImageMetaData imageData = new PdfDictionaryImageMetaData(dictionary);
PixelFormat format = GetPixelFormat(imageData.ColorSpace, imageData.BitsPerPixel, true);
Bitmap bitmap = new Bitmap(imageData.Width, imageData.Height, format);
// Determine if BLACK=1, create proper indexed color palette.
CCITTFaxDecodeParameters ccittFaxDecodeParameters = new CCITTFaxDecodeParameters(dictionary.Elements["/DecodeParms"].Get() as PdfDictionary);
if (ccittFaxDecodeParameters.BlackIs1) bitmap.Palette = PdfIndexedColorSpace.CreateColorPalette(Color.Black, Color.White);
else bitmap.Palette = PdfIndexedColorSpace.CreateColorPalette(Color.White, Color.Black);
using (MemoryStream stream = new MemoryStream(GetTiffImageBufferFromCCITTFaxDecode(imageData, dictionary.Stream.Value))) {
using (Tiff tiff = Tiff.ClientOpen("<INLINE>", "r", stream, new TiffStream())) {
if (tiff == null) return (null);
int stride = tiff.ScanlineSize();
byte[] buffer = new byte[stride];
for (int i = 0; i < imageData.Height; i++) {
tiff.ReadScanline(buffer, i);
Rectangle imgRect = new Rectangle(0, i, imageData.Width, 1);
BitmapData imgData = bitmap.LockBits(imgRect, ImageLockMode.WriteOnly, PixelFormat.Format1bppIndexed);
Marshal.Copy(buffer, 0, imgData.Scan0, buffer.Length);
bitmap.UnlockBits(imgData);
}
}
}
return (bitmap);
}
PdfItem CreateValue(Type type, PdfDictionary oldValue)
{
ConstructorInfo ctorInfo = type.GetConstructor(BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic,
null, new Type[] { typeof(PdfDocument) }, null);
PdfObject obj = ctorInfo.Invoke(new object[] { this.owner.Owner }) as PdfObject;
if (oldValue != null)
{
obj.Reference = oldValue.Reference;
obj.Reference.Value = obj;
if (obj is PdfDictionary)
{
PdfDictionary dict = (PdfDictionary)obj;
dict.elements = ((PdfDictionary)oldValue).elements;
}
}
return obj;
}
private static PdfDictionary ProcessFilters(PdfDictionary dictionary)
{
PdfDictionary result;
// Create a dictionary mapping (i.e. switch statement) to process the expected filters.
var map = new Dictionary<string, Func<byte[], byte[]>>() {
{ "/FlateDecode", (d) => {
var decoder = new FlateDecode();
return (decoder.Decode(d));
} }
};
// Get all of the filters.
var filters = ((PdfArray)dictionary.Elements["/Filter"])
.Elements.Where(e => e.IsName())
.Select(e => ((PdfName)e).Value)
.ToList();
// If only one filter in array. Just rewrite the /Filter
if (filters.Count == 1) {
result = dictionary.Clone();
result.Elements["/Filter"] = new PdfName(filters[0]);
return (result);
}
// Process each filter in order. The last filter should be the actual encoded image.
byte[] data = dictionary.Stream.Value;
for(int index = 0; index < (filters.Count - 1); index++) {
if (! map.ContainsKey(filters[index])) {
throw new NotSupportedException(String.Format("Encountered embedded image with multiple filters: \"{0}\". Unable to process the filter: \"{1}\".",
String.Join(",", filters), filters[index]));
}
data = map[filters[index]].Invoke(data);
}
result = new PdfDictionary();
result.Elements.Add("/Filter", new PdfName(filters.Last()));
foreach (var element in dictionary.Elements.Where(e => !String.Equals(e.Key, "/Filter", StringComparison.OrdinalIgnoreCase))) {
result.Elements.Add(element.Key, element.Value);
}
result.CreateStream(data);
return(result);
}
/// <summary>
/// Initializes a new instance from an existing dictionary. Used for object type transformation.
/// </summary>
protected PdfDictionary(PdfDictionary dict)
: base(dict)
{
if (dict.elements != null)
dict.elements.ChangeOwner(this);
if (dict.stream != null)
dict.stream.SetOwner(this);
}
/// <param name="dictionary">The dictionary object o parse.</param>
public PdfDictionaryImageMetaData(PdfDictionary dictionary)
{
Initialize(dictionary);
}
private IScannedImage ExportAsPngImage(PdfPage page, PdfDictionary image)
{
int width = image.Elements.GetInteger(PdfImage.Keys.Width);
int height = image.Elements.GetInteger(PdfImage.Keys.Height);
int bitsPerComponent = image.Elements.GetInteger(PdfImage.Keys.BitsPerComponent);
var buffer = image.Stream.UnfilteredValue;
Bitmap bitmap;
ScanBitDepth bitDepth;
switch (bitsPerComponent)
{
case 8:
bitmap = new Bitmap(width, height, PixelFormat.Format24bppRgb);
bitDepth = ScanBitDepth.C24Bit;
RgbToBitmapUnmanaged(height, width, bitmap, buffer);
break;
case 1:
bitmap = new Bitmap(width, height, PixelFormat.Format1bppIndexed);
bitDepth = ScanBitDepth.BlackWhite;
BlackAndWhiteToBitmapUnmanaged(height, width, bitmap, buffer);
break;
default:
throw new NotImplementedException("Unsupported image encoding (expected 24 bpp or 1bpp)");
}
using (bitmap)
{
bitmap.SetResolution(bitmap.Width / (float)page.Width.Inch, bitmap.Height / (float)page.Height.Inch);
return scannedImageFactory.Create(bitmap, bitDepth, true);
}
}
/// <param name="dictionary">The dictionary element to parse / retrieve.</param>
public CCITTFaxDecodeParameters(PdfDictionary dictionary):this()
{
if (dictionary == null) return;
if (dictionary.Elements.ContainsKey(_K)) {
K = dictionary.Elements.GetInteger(_K);
}
if (dictionary.Elements.ContainsKey(END_OF_LINE)) {
EndOfLine = dictionary.Elements.GetBoolean(END_OF_LINE);
}
if (dictionary.Elements.ContainsKey(ENCODED_BYTE_ALIGN)) {
EncodedByteAlign = dictionary.Elements.GetBoolean(ENCODED_BYTE_ALIGN);
}
if (dictionary.Elements.ContainsKey(COLUMNS)) {
Columns = dictionary.Elements.GetInteger(COLUMNS);
}
if (dictionary.Elements.ContainsKey(ROWS)) {
Rows = dictionary.Elements.GetInteger(ROWS);
}
if (dictionary.Elements.ContainsKey(END_OF_BLOCK)) {
EndOfBlock = dictionary.Elements.GetBoolean(END_OF_BLOCK);
}
if (dictionary.Elements.ContainsKey(BLACK_IS_1)) {
BlackIs1 = dictionary.Elements.GetBoolean(BLACK_IS_1);
}
if (dictionary.Elements.ContainsKey(DAMAGED_ROWS_BEFORE_ERROR)) {
DamagedRowsBeforeError = dictionary.Elements.GetInteger(DAMAGED_ROWS_BEFORE_ERROR);
}
}
private void ShrinkJpegImage(PdfDictionary image, int quality)
{
try
{
string filter = image.Elements.GetName("/Filter");
if (filter != "/DCTDecode") return;
Stream originalImageStream = new MemoryStream(image.Stream.Value);
Image originalJpegImage = Image.FromStream(originalImageStream);
byte[] newJpegImage = SaveJpeg(originalJpegImage, quality);
image.Stream.Value = newJpegImage;
}
catch (Exception)
{
return;
}
}
/// <summary>
/// Writes the stream of the specified dictionary.
/// </summary>
public void WriteStream(PdfDictionary value, bool omitStream)
{
StackItem stackItem = (StackItem)this.stack[this.stack.Count - 1];
Debug.Assert(stackItem.Object is PdfDictionary);
Debug.Assert(stackItem.Object.IsIndirect);
stackItem.HasStream = true;
if (this.lastCat == CharCat.NewLine)
WriteRaw(">>\nstream\n");
else
WriteRaw(" >>\nstream\n");
if (omitStream)
WriteRaw(" «...stream content omitted...»\n"); // useful for debugging only
else
{
byte[] bytes = value.Stream.Value;
if (bytes.Length != 0)
{
if (this.securityHandler != null)
{
bytes = (byte[])bytes.Clone();
bytes = this.securityHandler.EncryptBytes(bytes);
}
Write(bytes);
if (this.lastCat != CharCat.NewLine)
WriteRaw('\n');
}
}
WriteRaw("endstream\n");
}
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;
}
internal PdfCustomValue(PdfDictionary dict)
: base(dict)
{
// TODO: uncompress stream
}
/// <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;
}
