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

[bugzilla-daemon at freedesktop.org]

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

          Priority: medium
            Bug ID: 55977
          Assignee: poppler-bugs at lists.freedesktop.org
           Summary: handling of rtl text inversion is too naive
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: alexbodn.groups at gmail.com
          Hardware: All
            Status: NEW
           Version: unspecified
         Component: general
           Product: poppler

Created attachment 68555
  --> https://bugs.freedesktop.org/attachment.cgi?id=68555&action=edit
the patch itself, made on poppler 0.20.3. please give it a try.

textpage::dumpfragment makes an attempt to reorder text in it's original
directionality. i mean, reorder visual to logical order.

however, this is generally a very heavy issue to implement, handled (to my
knowledge of foss) only in icu. 
fribidi does only reorder logical text to visual, which may also help here, but
it's not the real thing.

here is a patch to implement the icu algorithm, with a fribidi fallback, in
poppler.

i did it since the current attempt is not quite correct. a test file to test
with pdftotext will be attached too.

please feel free to comment an enjoy.

best regards,
alex

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