/**
* Creats a PdfImage object using an explicitly provided dictionary and image bytes
* @param dictionary the dictionary for the image
* @param samples the samples
* @since 5.0.3
*/
protected internal PdfImageObject(PdfDictionary dictionary, byte[] samples, PdfDictionary colorSpaceDic)
{
this.dictionary = dictionary;
this.colorSpaceDic = colorSpaceDic;
TrackingFilter trackingFilter = new TrackingFilter();
IDictionary <PdfName, FilterHandlers.IFilterHandler> handlers = new Dictionary <PdfName, FilterHandlers.IFilterHandler>(FilterHandlers.GetDefaultFilterHandlers());
handlers[PdfName.JBIG2DECODE] = trackingFilter;
handlers[PdfName.DCTDECODE] = trackingFilter;
handlers[PdfName.JPXDECODE] = trackingFilter;
imageBytes = PdfReader.DecodeBytes(samples, dictionary, handlers);
if (trackingFilter.lastFilterName != null)
{
if (PdfName.JBIG2DECODE.Equals(trackingFilter.lastFilterName))
{
streamContentType = ImageBytesType.JBIG2;
}
else if (PdfName.DCTDECODE.Equals(trackingFilter.lastFilterName))
{
streamContentType = ImageBytesType.JPG;
}
else if (PdfName.JPXDECODE.Equals(trackingFilter.lastFilterName))
{
streamContentType = ImageBytesType.JP2;
}
}
else
{
DecodeImageBytes();
}
}
/**
* 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();
}
}
/**
* Creats a PdfImage object using an explicitly provided dictionary and image bytes
* @param dictionary the dictionary for the image
* @param samples the samples
* @since 5.0.3
*/
protected internal PdfImageObject(PdfDictionary dictionary, byte[] samples, PdfDictionary colorSpaceDic) {
this.dictionary = dictionary;
this.colorSpaceDic = colorSpaceDic;
TrackingFilter trackingFilter = new TrackingFilter();
IDictionary<PdfName, FilterHandlers.IFilterHandler> handlers = new Dictionary<PdfName, FilterHandlers.IFilterHandler>(FilterHandlers.GetDefaultFilterHandlers());
handlers[PdfName.JBIG2DECODE] = trackingFilter;
handlers[PdfName.DCTDECODE] = trackingFilter;
handlers[PdfName.JPXDECODE] = trackingFilter;
imageBytes = PdfReader.DecodeBytes(samples, dictionary, handlers);
if (trackingFilter.lastFilterName != null){
if (PdfName.JBIG2DECODE.Equals(trackingFilter.lastFilterName))
streamContentType = ImageBytesType.JBIG2;
else if (PdfName.DCTDECODE.Equals(trackingFilter.lastFilterName))
streamContentType = ImageBytesType.JPG;
else if (PdfName.JPXDECODE.Equals(trackingFilter.lastFilterName))
streamContentType = ImageBytesType.JP2;
} else {
DecodeImageBytes();
}
}
/**
* 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();
}
}
