[gs-devel] Re: CJK patches for Ghostscript

[mpsuzuki at hiroshima-u.ac.jp]

Hi,

Due to my posts to gs-devel have been blocked by
attached files, here I repost my post 3 days ago,
I removed attached files and uploaded them to web.

--

I don't have sufficient time to make comprehensive
investigation report, but I think gs-8.x TTF CIDFont
emulator cannot display vertical text, in all versions.

I attached example PostScript file and rasterized
results of several versions.

http://home.hiroshima-u.ac.jp/mpsuzuki/article9.ps
	PS file including vertical text.

http://home.hiroshima-u.ac.jp/mpsuzuki/article9_scanned.pdf
	Scanned image of Japanese PS printer output (@ 300dpi).

http://home.hiroshima-u.ac.jp/mpsuzuki/article9_gs707.png
	Result by ghostscript 7.07.

http://home.hiroshima-u.ac.jp/mpsuzuki/article9_gs815.png
	Result by ESP ghostscript 8.15.1 without CJK patch.

http://home.hiroshima-u.ac.jp/mpsuzuki/article9_gs815+cjk.png
	Result by ESP ghostscript 8.15.1 with CJK patch.

http://home.hiroshima-u.ac.jp/mpsuzuki/article9_gs860.png
	Result by the latest ghostscript.

Apparently, all punctiuations in results by gs8.x
(without CJK patch) are in horizontal forms.
In addition, the latest gs8 cannot calculate correct
centerline for vertical text, it's worse than vanilla
ESP ghostscript 8.15.1.

Regards,
mpsuzuki

On Wed, 20 Jun 2007 22:58:25 -0700
Ray Johnston <Ray.Johnston at Artifex.com> wrote:

>Ralph, et. al.,
>
>I'd also like to solicit Suzuki Toshiya (mpsuzuki at hiroshima-u.ac.jp)
>on this issue. He was  a member of the gs-cjk development team and,
>I believe, has given presentations to the linux community on the
>problems in Igor's TTF CIDFont emulation methodology (as exists in
>gs 8.60 PRE-RELEASE) with some vertical writing and other issues.
>
>Let's all see if we can get the facts and get this issue properly
>resolved before doing the 'merge' release so we don't see regressions
>in the CJK printing world.
>
>Any specific problems with gs HEAD (8.57 and later) should be put
>into bugs.ghostscript.com so we can track them.
>
>Regards,
>Ray
>------------------------------------------------------------------------
>
>Ralph Giles wrote:
>> On Wed, Jun 20, 2007 at 04:59:38PM +0100, Till Kamppeter wrote:
>>
>>   
>>> ESP Ghostscript contained patches to fix several issues with CJK font 
>>> support, as correct vertical typesetting and completeness of the 
>>> character sets. See this presentation of Yasumasa TORATANI from Canon:
>>>
>>> https://www.linux-foundation.org/images/8/87/GSCJK-070616-1.pdf
>>>     
>>
>> Can you confirm this is still an issue in Ghostscrpt 8.56 or trunk?
>>
>> We'd definitely like to get this resolved, but the details would be up 
>> to Leonardo.
>>
>>  -r
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>>
>>   
>
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