[cl-pdf-devel] Re: [cl-typesetting-devel] Unicode?
Peter Seibel
peter at gigamonkeys.com
Sat Sep 8 15:16:22 UTC 2007
Marc Battyani wrote:
>
> Peter Seibel wrote:
>
> [...]
>> Anyway, after some more investigation, I think the problem goes much
>> deeper than just a font metric issue. I looked at the PDF file
>> generated when I made the text was (format nil "A~cB" (code-char
>> #x2014). In the PDF there's a:
>>
>> (A?B) Tj
>>
>> where the ? is actually the character #x14, i.e. the bottom byte of
>> the #x2014 character. It conceivable that through some proper
>> manipulation of external-formats somewhere I could fix that but it
>> wouldn't help because, as far as I understand the PDF spec, (...)
>> strings can only contain ASCII characters. There is obviously some way
>> to include Unicode text (uncoded in UTF-16BE, I believe) in PDFs but
>> it's much more involved than just throwing some text between ()'s. I
>> think the relevant sections of the PDF spec may be 5.6 Composite Fonts
>> and following.
> I'm just catching up. So do you still have the problem? If that's the
> case, I will have a look at it this WE.
Yes, as far as I can tell some moderately significant surgery needs to
be done to really support arbitrary Unicode characters. For another test
case, you can use:
(pdf:draw-text (format nil "~c~c" (code-char #x6e05) (code-char #x6167)))
Which are the two Chinese characters you can see on this web page:
<http://www.gigamonkeys.com/amelia/>
-Peter
--
Peter Seibel : peter at gigamonkeys.com
A Billion Monkeys Can't be Wrong : http://www.gigamonkeys.com/blog/
Practical Common Lisp : http://www.gigamonkeys.com/book/
Coders at Work : http://www.codersatwork.com/
More information about the cl-pdf-devel
mailing list