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

[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.

> 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?

>> 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).

>> 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
>>>
>>>
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>>> poppler at lists.freedesktop.org
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> 
>