[poppler] Wrong Unicode mapping of the Omega symbol

[王璐]

On Thu, Aug 9, 2012 at 1:30 PM, 王璐 <coolwanglu at gmail.com> wrote:

> Hello,
>
>   I've got a pdf created by LaTeX, with special fonts for maths.
>   There are chars named Omega, which can be displayed correctly according
> to the font (also with the Omega slot).
>
>   I'm now working on a project called pdf2htmlEX, I need to map chars to
> "meaningful" Unicodes for text selection, meanwhile the fonts should also
> be remapped.
>   In my case, the fonts are remapped with Fontforge, where Omega is mapped
> to the correct Unicode value; but poppler didn't, in the final HTML, the
> symbol was not displayed with the font math, as the symbol cannot be found
> in the font.
>
>    I think pdftohtml in poppler will also suffer from this problem when
> font embedding is implemented.
>
>    I've found more references:
>
> http://en.wikipedia.org/wiki/Ohm#cite_note-2
>
> http://www.unicode.org/versions/Unicode4.0.0/ch07.pdf#search=%22character%20U%2B2126%20maps%20OR%20map%20OR%20mapping%22
>
>    So Ohm is is included for backward compatibility, and Omega is
> preferred. which means it'd be ok if both Ohm and Omega are mapped to
> 0x03A0. But we should never map Omega to 0x2126.
>

should be 0x03A9. Sorry.

>
>   Thanks
>
>    - Lu
>   2012.08.09
>
>
> On Thu, Aug 9, 2012 at 6:29 AM, Albert Astals Cid <aacid at kde.org> wrote:
>
>> El Dijous, 9 d'agost de 2012, a les 00:04:51, 王璐 va escriure:
>> > Hi all,
>>
>> Hi
>>
>> >    In poppler/NameToUnicodeTable.h
>> >
>> >
>> >    Both Ohm and Omega are mapping to 0x2126, which is incorrect.
>> >
>> >    Should be
>> >
>> >    Ohm -> 0x2126
>> >    Omega -> 0x03A9
>> >
>> >    Reference:
>> > http://www.fileformat.info/info/unicode/char/2126/index.htm
>> > http://www.fileformat.info/info/unicode/char/03a9/index.htm
>> >
>> >    I wonder how this file was created, do we need to check other
>> symbols?
>>
>> Ask the xpdf author (oh wait he won't answer)
>>
>> Now bad jokes aside, do you have a pdf showing a problem because of this?
>>
>> Cheers,
>>   Albert
>>
>> >
>> >
>> >    Thanks
>> >
>> >    - Lu
>> >    2012.08.09
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>>
>
>
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