fake feature “extend” behaving weirdly

fake feature “extend” behaving weirdly

[Philipp Gesang]

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Hi Hans,

this got posted on the DANTE list today.

  \definefontfeature [quite_wide] [extend=1.5]
  \definefont [mainfont] [file:Iwona-Regular.otf]
  \definefont [widefont] [file:Iwona-Regular.otf*quite_wide]

  \starttext
    \mainfont
    {\widefont foo} %% comment this line and “bar” is fine
    bar
    {\widefont baz}
  \stoptext

The example defines two fonts with the same base font. If the
scaled variant is used before the regular one then the latter
will appear scaled as well and the spacing (bboxes?) gets messed
up.

I suspect a relation to this old issue:

  http://tracker.luatex.org/view.php?id=829

but if I substitute “slant” for “extend” the behavior is
different.

Best,
Philipp


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Re: fake feature “extend” behaving weirdly

[Hans Hagen]

On 9/29/2013 11:55 PM, Philipp Gesang wrote:
> Hi Hans,
>
> this got posted on the DANTE list today.
>
>    \definefontfeature [quite_wide] [extend=1.5]
>    \definefont [mainfont] [file:Iwona-Regular.otf]
>    \definefont [widefont] [file:Iwona-Regular.otf*quite_wide]
>
>    \starttext
>      \mainfont
>      {\widefont foo} %% comment this line and “bar” is fine
>      bar
>      {\widefont baz}
>    \stoptext
>
> The example defines two fonts with the same base font. If the
> scaled variant is used before the regular one then the latter
> will appear scaled as well and the spacing (bboxes?) gets messed
> up.
>
> I suspect a relation to this old issue:
>
>    http://tracker.luatex.org/view.php?id=829
>
> but if I substitute “slant” for “extend” the behavior is
> different.

indeed a known bug in the backend that will be resolved once that part 
of the code has been cleaned up (extend etc is a seldom used hack so has 
a low priority)

Hans

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Re: fake feature “extend” behaving weirdly

[Philipp Gesang]

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···<date: 2013-09-30, Monday>···<from: Hans Hagen>···

> On 9/29/2013 11:55 PM, Philipp Gesang wrote:
> > Hi Hans,
> >
> > this got posted on the DANTE list today.
> >
> >    \definefontfeature [quite_wide] [extend=1.5]
> >    \definefont [mainfont] [file:Iwona-Regular.otf]
> >    \definefont [widefont] [file:Iwona-Regular.otf*quite_wide]
> >
> >    \starttext
> >      \mainfont
> >      {\widefont foo} %% comment this line and “bar” is fine
> >      bar
> >      {\widefont baz}
> >    \stoptext
> >
> > The example defines two fonts with the same base font. If the
> > scaled variant is used before the regular one then the latter
> > will appear scaled as well and the spacing (bboxes?) gets messed
> > up.
> >
> > I suspect a relation to this old issue:
> >
> >    http://tracker.luatex.org/view.php?id=829
> >
> > but if I substitute “slant” for “extend” the behavior is
> > different.
> 
> indeed a known bug in the backend that will be resolved once that part 
> of the code has been cleaned up (extend etc is a seldom used hack so has 
> a low priority)

Ah, so it’s the same bug. Thanks for clarifying!

Philipp


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