[XeTeX] fontspec and vertical writing with ICU layout

[Jonathan Kew]

On 5 Apr 2007, at 1:23 am, caapv 208 wrote:

> I wrote:
>
>> But how can I typeset vertical text with fontspec.
>> I have tried the RawFeature, but only the second
>> example
>> works:
>>
>> \documentclass{article}
>> \usepackage{graphics,fontspec}
>> \begin{document}
>> \setmainfont[Script=Kana,RawFeature=vertical]{Kozuka
>> Mincho Pro}
>> \rotatebox{-90}{紅玉}
>> \font\f="Kozuka Mincho Pro:script=kana,vertical"
>> \f\rotatebox{-90}{紅玉}
>> \end{document}
>>
>> RawFeature={script=kana,vertical} doesn't work
>> either.
>
> I think I got it for the ICU layout.  I haven't
> looked into the AAT question raised by Jjgod, though.
> In the while() loop in
>
> static void*
> loadOTfont(PlatformFontRef fontRef, XeTeXFont font, Fixed
> scaled_size, const char* cp1)
>
> the statement
>   goto next_option;
> is nested one step deeper for "vertical" than for
> other options.  Jonathan, is this correct?

Yes, that looks OK; however, on inspecting the code I see that it can  
be overly picky; it won't recognize the "vertical" option if it  
occurs at the end of the list of features, and has a trailing space  
afterwards (although the code was intended to ignore trailing spaces,  
and does so in other cases). This leads to a problem because I think  
fontspec tends to put spaces into \font command it creates.

> So a workaround for the current codebase is to put
> either ':' or ';' at the end of "vertical".
> Both
> [Script=Kana,RawFeature=vertical:]
> and
> [RawFeature={script=kana,vertical:}]
> work with fontspec v1.13a, and there seems no need
> for me to keep v1.10 around anymore.

I have just patched the code so that it will properly ignore trailing  
spaces on this option. Another workaround for the current xetex and  
fontspec code should be to move the "vertical" option to non-final  
position in the list, e.g.,

   RawFeature={vertical;script=kana}

should work.

Sorry for the hassle!

JK