Hi,
For the Scribus DTP software, I'm looking into the podofo-impose tool. I
discovered that the tool makes some mistakes in how images are copied into
the new document.
If I have in my source PDF file an Xobject with a reference to an SMask
object and in Length object as below:
15 0 obj <<
/Type /XObject
/Subtype /Image
/Width 400
/Height 250
/ColorSpace /DeviceRGB
/BitsPerComponent 8
/Length 16 0 R
/Filter /DCTDecode
/SMask 14 0 R
>>
stream ....
Then after podofo_impose this object is transformed into (linefeeds added
myself):
11 0 obj <<
/Type/XObject
/BitsPerComponent 8
/ColorSpace
/DeviceRGB
/Filter
/DCTDecode
/Height 250
/Length 18758
/SMask<</Type/XObject/BitsPerComponent
8/ColorSpace/DeviceGray/Filter/FlateDecode/Height 250/Length
120/Subtype/Image/Width 400>>
/Subtype/Image
/Width 400
>> stream ...
What you see here is that /Length and /SMask have been dereferenced and
became embedded instead of references. While for /Length this is
theoretically allowed, for /SMask this is illegal since it is a streaming
object. Also notice that the actual SMask stream is lost. Also, the
original /Length and /SMask objects are still in the output stream but
never referred to anymore.
I got this far, but now I'm lost in the pdodofo-impose source code. Can
anyone help me with getting this bug out, or tell me where this
dereferencing might occur in the code ?
I submitted a bug with corresponding files in
https://sourceforge.net/apps/mantisbt/podofo/view.php?id=46
Regards,
Jos
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