[poppler] Support for CJK fonts in postscript / on Windows platforms

Fri Mar 23 00:42:01 PDT 2012

Am 23.03.2012 08:21, schrieb suzuki toshiya:
> Dear Thomas,
>
> Thank you for speedy reply.
>
> Thomas Freitag wrote:
>> Am 23.03.2012 06:08, schrieb suzuki toshiya:
>>> But, for first, I could not reproduce the crashing problem by my
>>> binaries (pdffonts, pdftoppm and pdftops). Could you tell me more
>>> about your crashing problem (how to reproduce, sample PDF, etc)?
>> You cannot reproduce it anymore, I fixed that, too: In case that a CID 
>> font is expected but Helvetia is taken, the call of
>>
>> fontLoc = font->locateFont(xref, gTrue);
>>
>> returned a NULL which the causes a crash.
> OK, I will check.
>
>> As I explained, You should install ghostscript and then run
>>
>> gswin32c -q -dBATCH -sFONTDIR=<windows font directory>  
>> -sCIDFMAP=<popper data dir>/cidfmap mkcidfm.ps
> Excuse me, this is the 3rd issue in your first post (add a support
> to reflect cidfmap generated by ghostscript), that is not what I care.
> What I care is about hardwired MS-Mincho fallback.
It's just hard wired if a CID font is expected and no appropiate
substitute font is found. Propablay a better idea is to use arialuni.ttf
instead of MS Mincho, but when I started with it, I only knew that MS
Mincho is always installed and has some CJK chars.
>
>> I'm not really sure where the poppler data dir ist expected on MinGW, 
>> should be /usr/local/share/poppler, otherwise You can patch the code 
>> where the GlobalParam constructor is called , I do it normally under 
>> windows:
>>
>> globalParams = new 
>> GlobalParams("E:\\Downloads\\poppler\\poppler-data-0.4.5");
>>
>> and copy  cidfmap to that directory.
>> If You don't do this (and only then), all CJK fonts fall back to MS Mincho.
> Yes, it (the case without cidfmap) is what I care. I think "all CJK
> fonts fall back to MS Mincho" is worse than fallback to Helvetica,
> as shown by my 2 sample pictures. BTW, in your environment with cidfmap
> generated by ghostscript, my sample PDF (referring CJK CID-keyed fonts)
> is processed correctly?
We can't fall back to helvetica, if a CID font is expected. In this case
locateFont returns a NULL pointer!
No, I've to insert additional lines in cidfmap, I attach it:
mkcifdmap.ps doesn't search for Pr-fonts. I add only lines for 4 fonts,
of course I could do it also for the others. I just want to show how
easy it is.
I attach my cidfmap (be carefull, my windows home directory is
f:/windows). With these additional lines I got the attached result, and
these warnings:

Syntax Error: Couldn't find a font for 'MS-PMincho', subst is 'MS-Mincho'
Syntax Error: Couldn't find a font for 'MS-Gothic', subst is 'MS-Mincho'
Syntax Error: Couldn't find a font for 'MS-PGothic', subst is 'MS-Mincho'
Syntax Error: Couldn't find a font for 'MS-UIGothic', subst is 'MS-Mincho'
Syntax Error: Couldn't find a font for 'RyuminPr6-Light-Identity-H',
subst is 'ArialUnicodeMS-JP;'
Syntax Error: Couldn't find a font for 'RyuminPr6-Light-Identity-H'
Syntax Error: Couldn't find a font for 'RyuminPr6-Light-Identity-H',
subst is 'ArialUnicodeMS-JP;'
Syntax Error: Couldn't find a font for 'RyuminPr6-Light-Identity-H'
Syntax Error: Couldn't find a font for 'GothicBBBPr6-Medium-Identity-H',
subst is 'ArialUnicodeMS-JP'
Syntax Error: Couldn't find a font for 'HiraMinPro-W3-Identity-H', subst
is 'ArialUnicodeMS-JP'
Syntax Error: Couldn't find a font for 'HiraKakuStd-W3-Identity-H',
subst is 'ArialUnicodeMS-JP'

>
>>> Thus, I'm afraid more efforts are needed for hardwired CID-keyed
>>> font fallback. At least, using MS-Mincho is not good idea, and,
>>> appropriate warning should be printed. Of course, I'm willing to
>>> work for this issue.
>> Isn't
>> error(-1, "Couldn't find a font for '%s', subst is '%s'", 
>> fontName->getCString(), substFontName);
>>
>> an appropiate warning???
> I think it's slightly insufficient, substitution of CID-keyed font
> by non-CID-keyed is warned with more detail (Adobe-Japan1 font blah
> blah blah is substituted by non-CID-keyed blah blah blah).
You're not completely true: a non-CID-keyed font is still substituted by
Helvetica, only a CID-keyed font is replaced by MS Mincho. But if You
want another warning, just feel free to change the code.

Cheers,
Thomas
>
>>> Thomas Freitag wrote:
>>>> Am 03.03.2012 17:40, schrieb suzuki toshiya:
>>>>> Hi,
>>>>>
>>>>> I'm quite sorry for that no CJK helpers involves this issue...
>>>>> The required help is a rewrite of your patch to fit the poppler
>>>>> coding convention, and for the maintainers working with Unix
>>>>> systems? If it is possible to do without Visual Studio, I will
>>>>> try.
>>>> Hopefully done now. As far as I rmember it was  Your patch (bug 11413) I
>>>> just applied to PSOutputDev.cc
>>>>> BTW, yet I've not checked your patch in detail, your patch is
>>>>> trying to convert all missing (non-embedded) CID-keyed CJK fonts
>>>>> by MS Mincho? I think it is not good idea for the users of
>>>>> Adobe-GB1 (PRC, Singapore), Adobe-CNS1 (Taiwan, HongKong),
>>>>> Adobe-Korea1 (ROK). I'm not sure if Ghostscript does so, but
>>>>> even if Ghostscript does so, poppler should not follow it.
>>>>> In fact, the coverage of CJK Ideographs are differently
>>>>> designed to fit to each markets.
>>>> No, it was not my goal to substitute all CID keyed fonts by MS Mincho.
>>>> The problem under Windows is just, that if there is no font with the
>>>> used name installed, poppler tried to replace it with Helvetica, but
>>>> because this is not a CID font no characters at all will be shown. So I
>>>> thought that MS Mincho is at least for this case a better idea as a
>>>> default CID font.
>>>> But if You copy the cidfmap produced by mkcidfm.ps from ghostscript in
>>>> the poppler data dir, that substitute font table will be used if (and
>>>> only if) the font is not embedded and not installed under windows. Hope
>>>> that fits for CJK users, I thought it was better to use an existing
>>>> substitution algorithm than do nothing. And as far as I understand
>>>> mkcidfm.ps it will also try to find suitable fonts for GB1, CNS1 and the
>>>> others, but I'm no expert for CJK fonts. The cidfmap I produced on my
>>>> system would use arialuni.ttf for all CJK fonts, but I have just the
>>>> Microsoft default fonts.
>>>>
>>>> Regards,
>>>> Thomas
>>>>
>>>>
>>>> _______________________________________________
>>>> poppler mailing list
>>>> poppler at lists.freedesktop.org
>>>> http://lists.freedesktop.org/mailman/listinfo/poppler
>>
>
> .
>

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