Hi, sorry for the late reply (I have noticed your previous post, but it
was on my way on vacation).

On Wed, Aug 06, 2008 at 12:11:26PM +1000, Robert Backhaus wrote:
> When I attempt to edit any text on some pdfs, the editable text shown
> in the dynamic toolbar is scrambled. for instance, the text "Tax
> Invoice #000335" is shown as "8E\ -RZSMGI        " (in case the
> non-printing characters get lost they are (in unicode)
> 0004,0004,0007,0014(three times)0017(twice),0019.)
> This is a pdf created by the gnome print tool. 

Does this happen for all generated documents? Have you tried some simple
documents with small amount of text with/without special characters?

> A pdf file that shows this behavior is attached. PDFs created by cups
> out of notepad show this behaviour, but when created out of OpenOffice
> do not.

I will try to look at it, but my email backlog is rather long after
vacation, so it may take a while. 

Maybe Jozo could look at it too...

> 
> I have noticed that the text is in a custom font, with a name such as
> "NAAAAA+DejaVuSansMono". If I insert new text using this font, the
> text I enter is scrambled in the pdf, and many typed characters show
> as unfilled boxes. (In PDFs out of OpenOffice, any characters not in
> the original document show up as unfilled boxes. Characters in that
> font in the original document display correctly)
> 
> It seems to me that the pdf file only includes glyphs as they are used
> in the file, and numbers them as it requires them. Or it may be some
> abortive DRM move (although it is strange that gnome-print does it, if
> that is the case!)

This is an optimization to save some space for document. So pdf
generators use it to create smaller documents.

> 
> Is there any way to either unscramble the text in the pdf file, so
> text can be entered normally, 

You can insert system font and use it for your additional text.

> or to get pdfedit to show the descrambled text in the edit boxes, and
> rescramble the text when I am done editing it?

I am not sure how much we can do in this area, because pdf generator can
create almost arbitrary character mappings (at least as far as I
understand that - Jozo may give better background here).

But we should definitely be able to add a new text without any scrambles.

> 
> (I am sorry if this has been covered already: I browsed through the
> support mailing list and could not find anything, and the sourceforge
> list search appears to be broken.)

We have some reports about problems with accent characters as well as
problems with editing some text exported by OO. But it would be useful
to find some patterns to sort this problem out easier.

I think that it would be the best to report your problem in our
bugtracker with all your test documents and follow discussion there.

Thanks for reporting and testing.
-- 
Michal Hocko

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