[Poppler-bugs] [Bug 55977] handling of rtl text inversion is too naive

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=55977

--- Comment #36 from Albert Astals Cid <aacid at kde.org> ---
(In reply to comment #35)
> (In reply to comment #34)
> 
> hello albert,
> 
> > (In reply to comment #33)
> > > (In reply to comment #32)
> > > > (In reply to comment #31)
> > > > > (In reply to comment #30)
> > > > > > (In reply to comment #29)
> > > > > > You are removing lots of code, e.g. the "// Note: This code treats numeric
> > > > > > characters (European and", why? Can't we use that when ICU is not there?
> > > > > 
> > > > > it's not working properly, at all. rather try fribidi.
> > > > 
> > > > Trying fribidi is not the correct answer, we have already settled that ICU
> > > > is better. What I am asking if we should have that code as better than
> > > > nothing when the dependencies are not there. So in a world where i can't
> > > > have ICU, does having that code you removed gives better results than no
> > > > code at all?
> > > sorry, it's not better than nothing. btw, the code before lastly patched
> > > could be treated as "better than nothing", but not this one.
> > 
> > Hmmm, not sure i understand what you mean here, what is "the code before
> > lastly patched"?
> i've used the text output before, and it had a very rudimentary, but fairly
> decent 
> rtl approximation. but this got broken by a patch more recently applied,
> that comes 
> from xpdf. this situation made me work for a best of breed solution.
> > 
> > > > > > 
> > > > > > > as for finding (a) better place(s) to store reordering_mode, i'd like to
> > > > > > > consult you.
> > > > > > 
> > > > > > Sure, what's the question?
> > > > > > 
> > > > > the reordering mode helps taking us back to the logical (typing order) text
> > > > > that would be visualized in the order shown by the doc. 
> > > > > on windows systems, ReorderingNumbersSpecial would normally prevail, while
> > > > > on pure unicode systems: ReorderingLikeDirect.

I never asked, but does this make sense? Does it mean that while reading a
given text you get different RTL text on Windows than on Linux? Why would
anyone want that? 


> > What do you mean by "systems serving clients on various platforms"?
> a server application may have clients that run on different os, with
> different 
> rtl reordering algorithms.

Sure, this is a nice theoretical scenario, do you really see poppler used in
that scenario? I guess it could, I think my biggest brain problem at the moment
is the one i made in the previous question, why would i want to see different
text depending if i'm a windows user or not


> > > yet, maybe the os checking could be not enough, and the document could
> > > contain additional hints for choosing this default.
> > 
> > With could do you mean "I know there is a PDF hint for that" or you mean
> > "maybe there is a PDF hint for that"?
> well, it's just maybe. the hints i'm talking about may come from some
> headers 
> mentioning the software used to create the pdf etc...

I don't think this is an option, it means guessing and playing like the browser
and the "web developers" do, it's prone to break.

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