/// <summary>Gets image bytes.</summary>
/// <remarks>
/// Gets image bytes.
/// Note,
/// <see cref="iText.Kernel.Pdf.PdfName.DCTDecode"/>
/// ,
/// <see cref="iText.Kernel.Pdf.PdfName.JBIG2Decode"/>
/// and
/// <see cref="iText.Kernel.Pdf.PdfName.JPXDecode"/>
/// filters will be ignored.
/// </remarks>
/// <param name="decoded">
/// if
/// <see langword="true"/>
/// , decodes stream bytes.
/// </param>
/// <returns>byte array.</returns>
public virtual byte[] GetImageBytes(bool decoded)
{
byte[] bytes;
bytes = GetPdfObject().GetBytes(false);
if (decoded)
{
IDictionary <PdfName, IFilterHandler> filters = new Dictionary <PdfName, IFilterHandler>(FilterHandlers.GetDefaultFilterHandlers
());
DoNothingFilter stubFilter = new DoNothingFilter();
filters.Put(PdfName.DCTDecode, stubFilter);
filters.Put(PdfName.JBIG2Decode, stubFilter);
filters.Put(PdfName.JPXDecode, stubFilter);
bytes = PdfReader.DecodeBytes(bytes, GetPdfObject(), filters);
if (stubFilter.GetLastFilterName() == null)
{
try {
bytes = new ImagePdfBytesInfo(this).DecodeTiffAndPngBytes(bytes);
}
catch (System.IO.IOException e) {
throw new Exception("IO exception in PdfImageXObject", e);
}
}
}
return(bytes);
}
/// <summary>
/// Identifies the type of the image that is stored in the bytes of this
/// <see cref="PdfImageXObject"/>
/// .
/// Note that this has nothing to do with the original type of the image. For instance, the return value
/// of this method will never be
/// <see cref="iText.IO.Image.ImageType.PNG"/>
/// as we loose this information when converting a
/// PNG image into something that can be put into a PDF file.
/// The possible values are:
/// <see cref="iText.IO.Image.ImageType.JPEG"/>
/// ,
/// <see cref="iText.IO.Image.ImageType.JPEG2000"/>
/// ,
/// <see cref="iText.IO.Image.ImageType.JBIG2"/>
/// ,
/// <see cref="iText.IO.Image.ImageType.TIFF"/>
/// ,
/// <see cref="iText.IO.Image.ImageType.PNG"/>
/// </summary>
/// <returns>the identified type of image</returns>
public virtual ImageType IdentifyImageType()
{
PdfObject filter = GetPdfObject().Get(PdfName.Filter);
PdfArray filters = new PdfArray();
if (filter != null)
{
if (filter.GetObjectType() == PdfObject.NAME)
{
filters.Add(filter);
}
else
{
if (filter.GetObjectType() == PdfObject.ARRAY)
{
filters = ((PdfArray)filter);
}
}
}
for (int i = filters.Size() - 1; i >= 0; i--)
{
PdfName filterName = (PdfName)filters.Get(i);
if (PdfName.DCTDecode.Equals(filterName))
{
return(ImageType.JPEG);
}
else
{
if (PdfName.JBIG2Decode.Equals(filterName))
{
return(ImageType.JBIG2);
}
else
{
if (PdfName.JPXDecode.Equals(filterName))
{
return(ImageType.JPEG2000);
}
}
}
}
// None of the previous types match
ImagePdfBytesInfo imageInfo = new ImagePdfBytesInfo(this);
if (imageInfo.GetPngColorType() < 0)
{
return(ImageType.TIFF);
}
else
{
return(ImageType.PNG);
}
}
/// <summary>Gets image bytes.</summary>
/// <remarks>
/// Gets image bytes.
/// Note,
/// <see cref="iText.Kernel.Pdf.PdfName.DCTDecode"/>
/// ,
/// <see cref="iText.Kernel.Pdf.PdfName.JBIG2Decode"/>
/// and
/// <see cref="iText.Kernel.Pdf.PdfName.JPXDecode"/>
/// filters will be ignored.
/// </remarks>
/// <param name="decoded">
/// if
/// <see langword="true"/>
/// , decodes stream bytes.
/// </param>
/// <returns>byte array.</returns>
public virtual byte[] GetImageBytes(bool decoded)
{
// TODO: DEVSIX-1792 replace `.getBytes(false)` with `getBytes(true) and remove manual decoding
byte[] bytes = GetPdfObject().GetBytes(false);
if (decoded)
{
IDictionary <PdfName, IFilterHandler> filters = new Dictionary <PdfName, IFilterHandler>(FilterHandlers.GetDefaultFilterHandlers
());
filters.Put(PdfName.JBIG2Decode, new DoNothingFilter());
bytes = PdfReader.DecodeBytes(bytes, GetPdfObject(), filters);
ImageType imageType = IdentifyImageType();
if (imageType == ImageType.TIFF || imageType == ImageType.PNG)
{
try {
bytes = new ImagePdfBytesInfo(this).DecodeTiffAndPngBytes(bytes);
}
catch (System.IO.IOException e) {
throw new Exception("IO exception in PdfImageXObject", e);
}
}
}
return(bytes);
}
