[NTG-context] slanted font feature: LMTX vs. MkIV

[NTG-context] slanted font feature: LMTX vs. MkIV

[Pablo Rodriguez]

Dear list,

I have the following sample (using current latest from 2023.08.27 13:48):

  \setupinteractionscreen[option=max]
  \definefontfamily[maf][rm][DejaVu Sans]
    [sl={style:tf, features:{default,slanted}}]
  \setupbodyfont[maf, 8pt]
  \setupfittingpage[offset=1ex]
  \starttext
  \startTEXpage
  a {\em b}
  \stopTEXpage
  \startTEXpage[foregroundstyle={\setupbodyfont[100pt]}]
  a {\em b}
  \stopTEXpage
  \stoptext

Using LMTX higher font size gives less slanted text (or not at all).

Using MkIV text is slanted fine, independent from font size.

Could anyone confirm the issue?

Many thanks for your help,

Pablo
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[NTG-context] Re: slanted font feature: LMTX vs. MkIV

[Wolfgang Schuster]

Pablo Rodriguez schrieb am 02.09.2023 um 10:25:
> Dear list,
>
> I have the following sample (using current latest from 2023.08.27 13:48):
>
>    \setupinteractionscreen[option=max]
>    \definefontfamily[maf][rm][DejaVu Sans]
>      [sl={style:tf, features:{default,slanted}}]
>    \setupbodyfont[maf, 8pt]
>    \setupfittingpage[offset=1ex]
>    \starttext
>    \startTEXpage
>    a {\em b}
>    \stopTEXpage
>    \startTEXpage[foregroundstyle={\setupbodyfont[100pt]}]
>    a {\em b}
>    \stopTEXpage
>    \stoptext
>
> Using LMTX higher font size gives less slanted text (or not at all).
>
> Using MkIV text is slanted fine, independent from font size.
>
> Could anyone confirm the issue?

I can confirm the slant decreases at larger font sizes.

\starttext

\dostepwiserecurse{10}{100}{1}
   {{\switchtobodyfont[#1pt]#1pt:\definedfont[Serif*slanted]\vrule\relax 
S\vrule\relax lanted}\par}

\stoptext

Wolfgang

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[NTG-context] Re: slanted font feature: LMTX vs. MkIV

[Hans Hagen]

On 9/2/2023 11:45 AM, Wolfgang Schuster wrote:
> Pablo Rodriguez schrieb am 02.09.2023 um 10:25:
>> Dear list,
>>
>> I have the following sample (using current latest from 2023.08.27 13:48):
>>
>>    \setupinteractionscreen[option=max]
>>    \definefontfamily[maf][rm][DejaVu Sans]
>>      [sl={style:tf, features:{default,slanted}}]
>>    \setupbodyfont[maf, 8pt]
>>    \setupfittingpage[offset=1ex]
>>    \starttext
>>    \startTEXpage
>>    a {\em b}
>>    \stopTEXpage
>>    \startTEXpage[foregroundstyle={\setupbodyfont[100pt]}]
>>    a {\em b}
>>    \stopTEXpage
>>    \stoptext
>>
>> Using LMTX higher font size gives less slanted text (or not at all).
>>
>> Using MkIV text is slanted fine, independent from font size.
>>
>> Could anyone confirm the issue?
> 
> I can confirm the slant decreases at larger font sizes.
> 
> \starttext
> 
> \dostepwiserecurse{10}{100}{1}
>    {{\switchtobodyfont[#1pt]#1pt:\definedfont[Serif*slanted]\vrule\relax 
> S\vrule\relax lanted}\par}
> 
> \stoptext
in lpdf-lmt.lmt you can try:

l 593

tmsy = tmsy * sc

l 610

tmsy = tmsy * f_y_scale

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[NTG-context] Re: slanted font feature: LMTX vs. MkIV

[Wolfgang Schuster]

Hans Hagen schrieb am 02.09.2023 um 11:53:
> On 9/2/2023 11:45 AM, Wolfgang Schuster wrote:
>> Pablo Rodriguez schrieb am 02.09.2023 um 10:25:
>>> Dear list,
>>>
>>> I have the following sample (using current latest from 2023.08.27 
>>> 13:48):
>>>
>>>    \setupinteractionscreen[option=max]
>>>    \definefontfamily[maf][rm][DejaVu Sans]
>>>      [sl={style:tf, features:{default,slanted}}]
>>>    \setupbodyfont[maf, 8pt]
>>>    \setupfittingpage[offset=1ex]
>>>    \starttext
>>>    \startTEXpage
>>>    a {\em b}
>>>    \stopTEXpage
>>>    \startTEXpage[foregroundstyle={\setupbodyfont[100pt]}]
>>>    a {\em b}
>>>    \stopTEXpage
>>>    \stoptext
>>>
>>> Using LMTX higher font size gives less slanted text (or not at all).
>>>
>>> Using MkIV text is slanted fine, independent from font size.
>>>
>>> Could anyone confirm the issue?
>>
>> I can confirm the slant decreases at larger font sizes.
>>
>> \starttext
>>
>> \dostepwiserecurse{10}{100}{1}
>> {{\switchtobodyfont[#1pt]#1pt:\definedfont[Serif*slanted]\vrule\relax 
>> S\vrule\relax lanted}\par}
>>
>> \stoptext
> in lpdf-lmt.lmt you can try:
>
> l 593
>
> tmsy = tmsy * sc
>
> l 610
>
> tmsy = tmsy * f_y_scale

I get now with LMTX the same output as I get with MkIV, the slant stays 
the same for all sizes.

Wolfgang

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[NTG-context] Re: slanted font feature: LMTX vs. MkIV

[Pablo Rodriguez]

On 9/2/23 12:18, Wolfgang Schuster wrote:
> Hans Hagen schrieb am 02.09.2023 um 11:53:
> [...]
>> in lpdf-lmt.lmt you can try:
>>
>> l 593
>>
>> tmsy = tmsy * sc
>>
>> l 610
>>
>> tmsy = tmsy * f_y_scale
>
> I get now with LMTX the same output as I get with MkIV, the slant stays
> the same for all sizes.

This works also perfectly fine for me now.

Many thanks for the fix and the help, Hans and Wolfgang.

Sorry, but I don‘t know why this doesn‘t get the slanted font as bold (I
know I should know better, but I‘m stuck at this):

  \definefontfamily[mainface][rm][DejaVu Sans]
   [sl≃style:bf]
  \setupbodyfont
   [mainface, 100pt]
  \starttext
  \startTEXpage[offset=1ex]
  a {\em b}
  \stopTEXpage
  \stoptext

Many thanks for your help again,

Pablo
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[NTG-context] Re: slanted font feature: LMTX vs. MkIV

[Wolfgang Schuster]

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Pablo Rodriguez schrieb am 02.09.2023 um 12:35:
> [...]
> Sorry, but I don‘t know why this doesn‘t get the slanted font as bold (I
> know I should know better, but I‘m stuck at this):
>
>    \definefontfamily[mainface][rm][DejaVu Sans]
>     [sl≃style:bf]

You're using the wrong symbol (you have a math operator in your example) 
to assign a value to a key.

Wolfgang


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[NTG-context] Re: slanted font feature: LMTX vs. MkIV

[Pablo Rodriguez]

On 9/2/23 12:42, Wolfgang Schuster wrote:
> Pablo Rodriguez schrieb am 02.09.2023 um 12:35:
>> [...]
>> Sorry, but I don‘t know why this doesn‘t get the slanted font as bold (I
>> know I should know better, but I‘m stuck at this):
>>
>>   \definefontfamily[mainface][rm][DejaVu Sans]
>>    [sl≃style:bf]
>
> You're using the wrong symbol (you have a math operator in your example)
> to assign a value to a key.

Many thanks for your reply, Wolfgang.

As always, many thanks for your valuable help.

Somehow I copied the assymptopically equal to character (0x2243) to
typeset I cannot remember what, and I also placed it there (instead of
the standard equals char [0x003D]).

Sorry, I‘m afraid I wasn‘t able to spot the difference (at a relative
small font size).

Many thanks for your help again,

Pablo

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