private void FindColorspace(PdfObject colorspace, bool allowIndexed)
{
if (PdfName.DEVICEGRAY.Equals(colorspace))
{
stride = (width * bpc + 7) / 8;
pngColorType = 0;
}
else if (PdfName.DEVICERGB.Equals(colorspace))
{
if (bpc == 8 || bpc == 16)
{
stride = (width * bpc * 3 + 7) / 8;
pngColorType = 2;
}
}
else if (colorspace is PdfArray)
{
PdfArray ca = (PdfArray)colorspace;
PdfObject tyca = ca.GetDirectObject(0);
if (PdfName.CALGRAY.Equals(tyca))
{
stride = (width * bpc + 7) / 8;
pngColorType = 0;
}
else if (PdfName.CALRGB.Equals(tyca))
{
if (bpc == 8 || bpc == 16)
{
stride = (width * bpc * 3 + 7) / 8;
pngColorType = 2;
}
}
else if (PdfName.ICCBASED.Equals(tyca))
{
PRStream pr = (PRStream)ca.GetDirectObject(1);
int n = pr.GetAsNumber(PdfName.N).IntValue;
if (n == 1)
{
stride = (width * bpc + 7) / 8;
pngColorType = 0;
icc = PdfReader.GetStreamBytes(pr);
}
else if (n == 3)
{
stride = (width * bpc * 3 + 7) / 8;
pngColorType = 2;
icc = PdfReader.GetStreamBytes(pr);
}
}
else if (allowIndexed && PdfName.INDEXED.Equals(tyca))
{
FindColorspace(ca.GetDirectObject(1), false);
if (pngColorType == 2)
{
PdfObject id2 = ca.GetDirectObject(3);
if (id2 is PdfString)
{
palette = ((PdfString)id2).GetBytes();
}
else if (id2 is PRStream)
{
palette = PdfReader.GetStreamBytes(((PRStream)id2));
}
stride = (width * bpc + 7) / 8;
pngColorType = 3;
}
}
}
}
public byte[] GetImageAsBytes()
{
if (streamBytes == null)
{
return(null);
}
if (!decoded)
{
// if the stream hasn't been decoded, check to see if it is a single stage JPG or JPX encoded stream. If it is,
// then we can just use stream as-is
PdfName filter = dictionary.GetAsName(PdfName.FILTER);
if (filter == null)
{
PdfArray filterArray = dictionary.GetAsArray(PdfName.FILTER);
if (filterArray.Size == 1)
{
filter = filterArray.GetAsName(0);
}
else
{
throw new UnsupportedPdfException("Multi-stage filters not supported here (" + filterArray + ")");
}
}
if (PdfName.DCTDECODE.Equals(filter))
{
fileType = TYPE_JPG;
return(streamBytes);
}
else if (PdfName.JPXDECODE.Equals(filter))
{
fileType = TYPE_JP2;
return(streamBytes);
}
throw new UnsupportedPdfException("Unsupported stream filter " + filter);
}
pngColorType = -1;
width = dictionary.GetAsNumber(PdfName.WIDTH).IntValue;
height = dictionary.GetAsNumber(PdfName.HEIGHT).IntValue;
bpc = dictionary.GetAsNumber(PdfName.BITSPERCOMPONENT).IntValue;
pngBitDepth = bpc;
PdfObject colorspace = dictionary.GetDirectObject(PdfName.COLORSPACE);
palette = null;
icc = null;
stride = 0;
FindColorspace(colorspace, true);
MemoryStream ms = new MemoryStream();
if (pngColorType < 0)
{
if (bpc != 8)
{
return(null);
}
if (PdfName.DEVICECMYK.Equals(colorspace))
{
}
else if (colorspace is PdfArray)
{
PdfArray ca = (PdfArray)colorspace;
PdfObject tyca = ca.GetDirectObject(0);
if (!PdfName.ICCBASED.Equals(tyca))
{
return(null);
}
PRStream pr = (PRStream)ca.GetDirectObject(1);
int n = pr.GetAsNumber(PdfName.N).IntValue;
if (n != 4)
{
return(null);
}
icc = PdfReader.GetStreamBytes(pr);
}
else
{
return(null);
}
stride = 4 * width;
TiffWriter wr = new TiffWriter();
wr.AddField(new TiffWriter.FieldShort(TIFFConstants.TIFFTAG_SAMPLESPERPIXEL, 4));
wr.AddField(new TiffWriter.FieldShort(TIFFConstants.TIFFTAG_BITSPERSAMPLE, new int[] { 8, 8, 8, 8 }));
wr.AddField(new TiffWriter.FieldShort(TIFFConstants.TIFFTAG_PHOTOMETRIC, TIFFConstants.PHOTOMETRIC_SEPARATED));
wr.AddField(new TiffWriter.FieldLong(TIFFConstants.TIFFTAG_IMAGEWIDTH, width));
wr.AddField(new TiffWriter.FieldLong(TIFFConstants.TIFFTAG_IMAGELENGTH, height));
wr.AddField(new TiffWriter.FieldShort(TIFFConstants.TIFFTAG_COMPRESSION, TIFFConstants.COMPRESSION_LZW));
wr.AddField(new TiffWriter.FieldShort(TIFFConstants.TIFFTAG_PREDICTOR, TIFFConstants.PREDICTOR_HORIZONTAL_DIFFERENCING));
wr.AddField(new TiffWriter.FieldLong(TIFFConstants.TIFFTAG_ROWSPERSTRIP, height));
wr.AddField(new TiffWriter.FieldRational(TIFFConstants.TIFFTAG_XRESOLUTION, new int[] { 300, 1 }));
wr.AddField(new TiffWriter.FieldRational(TIFFConstants.TIFFTAG_YRESOLUTION, new int[] { 300, 1 }));
wr.AddField(new TiffWriter.FieldShort(TIFFConstants.TIFFTAG_RESOLUTIONUNIT, TIFFConstants.RESUNIT_INCH));
wr.AddField(new TiffWriter.FieldAscii(TIFFConstants.TIFFTAG_SOFTWARE, Document.Version));
MemoryStream comp = new MemoryStream();
TiffWriter.CompressLZW(comp, 2, streamBytes, height, 4, stride);
byte[] buf = comp.ToArray();
wr.AddField(new TiffWriter.FieldImage(buf));
wr.AddField(new TiffWriter.FieldLong(TIFFConstants.TIFFTAG_STRIPBYTECOUNTS, buf.Length));
if (icc != null)
{
wr.AddField(new TiffWriter.FieldUndefined(TIFFConstants.TIFFTAG_ICCPROFILE, icc));
}
wr.WriteFile(ms);
fileType = TYPE_TIF;
return(ms.ToArray());
}
PngWriter png = new PngWriter(ms);
png.WriteHeader(width, height, pngBitDepth, pngColorType);
if (icc != null)
{
png.WriteIccProfile(icc);
}
if (palette != null)
{
png.WritePalette(palette);
}
png.WriteData(streamBytes, stride);
png.WriteEnd();
fileType = TYPE_PNG;
return(ms.ToArray());
}
/**
* decodes the bytes currently captured in the streamBytes and replaces it with an image representation of the bytes
* (this will either be a png or a tiff, depending on the color depth of the image)
* @throws IOException
*/
private void DecodeImageBytes()
{
if (streamContentType != null)
{
throw new ArgumentException(MessageLocalization.GetComposedMessage("Decoding.can't.happen.on.this.type.of.stream.(.1.)", streamContentType.FileExtension));
}
pngColorType = -1;
PdfArray decode = dictionary.GetAsArray(PdfName.DECODE);
width = dictionary.GetAsNumber(PdfName.WIDTH).IntValue;
height = dictionary.GetAsNumber(PdfName.HEIGHT).IntValue;
bpc = dictionary.GetAsNumber(PdfName.BITSPERCOMPONENT).IntValue;
pngBitDepth = bpc;
PdfObject colorspace = dictionary.GetDirectObject(PdfName.COLORSPACE);
if (colorspace is PdfName && colorSpaceDic != null)
{
PdfObject csLookup = colorSpaceDic.GetDirectObject((PdfName)colorspace);
if (csLookup != null)
{
colorspace = csLookup;
}
}
palette = null;
icc = null;
stride = 0;
FindColorspace(colorspace, true);
MemoryStream ms = new MemoryStream();
if (pngColorType < 0)
{
if (bpc != 8)
{
throw new UnsupportedPdfException(MessageLocalization.GetComposedMessage("the.color.depth.1.is.not.supported", bpc));
}
if (PdfName.DEVICECMYK.Equals(colorspace))
{
}
else if (colorspace is PdfArray)
{
PdfArray ca = (PdfArray)colorspace;
PdfObject tyca = ca.GetDirectObject(0);
if (!PdfName.ICCBASED.Equals(tyca))
{
throw new UnsupportedPdfException(MessageLocalization.GetComposedMessage("the.color.space.1.is.not.supported", colorspace));
}
PRStream pr = (PRStream)ca.GetDirectObject(1);
int n = pr.GetAsNumber(PdfName.N).IntValue;
if (n != 4)
{
throw new UnsupportedPdfException(MessageLocalization.GetComposedMessage("N.value.1.is.not.supported", n));
}
icc = PdfReader.GetStreamBytes(pr);
}
else
{
throw new UnsupportedPdfException(MessageLocalization.GetComposedMessage("the.color.space.1.is.not.supported", colorspace));
}
stride = 4 * width;
TiffWriter wr = new TiffWriter();
wr.AddField(new TiffWriter.FieldShort(TIFFConstants.TIFFTAG_SAMPLESPERPIXEL, 4));
wr.AddField(new TiffWriter.FieldShort(TIFFConstants.TIFFTAG_BITSPERSAMPLE, new int[] { 8, 8, 8, 8 }));
wr.AddField(new TiffWriter.FieldShort(TIFFConstants.TIFFTAG_PHOTOMETRIC, TIFFConstants.PHOTOMETRIC_SEPARATED));
wr.AddField(new TiffWriter.FieldLong(TIFFConstants.TIFFTAG_IMAGEWIDTH, width));
wr.AddField(new TiffWriter.FieldLong(TIFFConstants.TIFFTAG_IMAGELENGTH, height));
wr.AddField(new TiffWriter.FieldShort(TIFFConstants.TIFFTAG_COMPRESSION, TIFFConstants.COMPRESSION_LZW));
wr.AddField(new TiffWriter.FieldShort(TIFFConstants.TIFFTAG_PREDICTOR, TIFFConstants.PREDICTOR_HORIZONTAL_DIFFERENCING));
wr.AddField(new TiffWriter.FieldLong(TIFFConstants.TIFFTAG_ROWSPERSTRIP, height));
wr.AddField(new TiffWriter.FieldRational(TIFFConstants.TIFFTAG_XRESOLUTION, new int[] { 300, 1 }));
wr.AddField(new TiffWriter.FieldRational(TIFFConstants.TIFFTAG_YRESOLUTION, new int[] { 300, 1 }));
wr.AddField(new TiffWriter.FieldShort(TIFFConstants.TIFFTAG_RESOLUTIONUNIT, TIFFConstants.RESUNIT_INCH));
wr.AddField(new TiffWriter.FieldAscii(TIFFConstants.TIFFTAG_SOFTWARE, Version.GetInstance().GetVersion));
MemoryStream comp = new MemoryStream();
TiffWriter.CompressLZW(comp, 2, imageBytes, height, 4, stride);
byte[] buf = comp.ToArray();
wr.AddField(new TiffWriter.FieldImage(buf));
wr.AddField(new TiffWriter.FieldLong(TIFFConstants.TIFFTAG_STRIPBYTECOUNTS, buf.Length));
if (icc != null)
{
wr.AddField(new TiffWriter.FieldUndefined(TIFFConstants.TIFFTAG_ICCPROFILE, icc));
}
wr.WriteFile(ms);
streamContentType = ImageBytesType.CCITT;
imageBytes = ms.ToArray();
return;
}
else
{
PngWriter png = new PngWriter(ms);
if (decode != null)
{
if (pngBitDepth == 1)
{
// if the decode array is 1,0, then we need to invert the image
if (decode.GetAsNumber(0).IntValue == 1 && decode.GetAsNumber(1).IntValue == 0)
{
int len = imageBytes.Length;
for (int t = 0; t < len; ++t)
{
imageBytes[t] ^= 0xff;
}
}
else
{
// if the decode array is 0,1, do nothing. It's possible that the array could be 0,0 or 1,1 - but that would be silly, so we'll just ignore that case
}
}
else
{
// todo: add decode transformation for other depths
}
}
png.WriteHeader(width, height, pngBitDepth, pngColorType);
if (icc != null)
{
png.WriteIccProfile(icc);
}
if (palette != null)
{
png.WritePalette(palette);
}
png.WriteData(imageBytes, stride);
png.WriteEnd();
streamContentType = ImageBytesType.PNG;
imageBytes = ms.ToArray();
}
}
