Re: Bug in CONTEXT/LuaTeX or just buggy font

[Mohammad Hossein Bateni <bateni@gmail.com>]

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On Wed, Aug 10, 2016 at 11:03 AM, Hans Hagen <pragma@wxs.nl> wrote:

> On 8/9/2016 10:41 PM, Mohammad Hossein Bateni wrote:
>
>> Hello,
>>
>> I have a bunch of simple fonts for Arabic/Persian.  These fonts lack
>> Latin characters, etc., so I use fallbacks to work with them.
>>
>> I just noticed that \high does not work with them, and have not been
>> able to pinpoint the issue.  See the MWE below.
>>
>>
>> \starttypescript [serif][samim][name]
>>   \definefontsynonym[Serif][Samim]
>> \stoptypescript
>>
>> \definetypeface [myfont][rm] [serif][samim][default]
>> \setupbodyfont [myfont]
>>
>> \starttext
>> %\definedfont[Samim*arabic]
>> ۱۲۳\high{۴}۵۶.
>> \stoptext
>>
>>
>> I am using Persian digits because the font lacks Latin digits as I
>> mentioned.  If I use the \definedfont approach, I don't see the
>> character ۴ (argument of \high) at all.  With the typescript approach,
>> the same character /is/ typeset but is /not/ raised; it appears on the
>> baseline but with smaller size.
>>
>> Any ideas why this is happening?  Could it be that some parameters, for
>> instance, \exheight are not properly set/read for this font?  Actually,
>> I looked at the non-math fontdimens in syst-fnt.mkiv, and everything
>> except \slantperpoint (expected) and \exheight (awkward) is non-zero.  I
>> don't know where \exheight comes from—perhaps from the height of glyph
>> for 'x', which the font lacks—however, \emheight is 12pt, although the
>> font also lacks a glyph for 'm'.
>>
>> I am also attaching the font in case that helps.
>>
>
> Normally one sets up a proper bodyfont (and environment if needed) while
> you use just a simple font switch and that one is unrelated to any other
> font setting.
>

Thanks!  But what does a `proper' bodyfont contain beside defining rm, ss,
tt and mm for 'myfont' above (with regular, bold, italic, and bolditalic)?
The above was a MWE but in my real example I am setting up these things
that I mentioned in a larger typescript.  How can I modify the font or the
typescript definitions (or the environment) to get \exheight right?


>
> I'll add two new commands: \sx and \sxx so that you can say:
>
>     \setuplow [style=\sx]
>     \setuphigh[style=\sx]
>

 If I do this, this will not get attached to the font; right?  For
instance, if I define two bodyfonts 'myfonta' and 'myfontb', and switch
between them in the document, then I have to stick to these two setups if
one font, say 'myfonta', is problematic.  Is that correct?

for such cases. However, as these are derived relative scales they are
> normally not compatible with \tx and txx sizes.
>
> Hans
>
> -----------------------------------------------------------------
>                                           Hans Hagen | PRAGMA ADE
>               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
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If your question is of interest to others as well, please add an entry to the Wiki!

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