[Fontconfig] Pango support for `size' OpenType feature?

[Behdad Esfahbod]

On 09/09/2012 01:30 AM, Werner LEMBERG wrote:
> 
>> The only Free Software font family I can think of that can use the
>> 'size' feature is Computer Modern.  And I don't think any of its
>> OpenType renditions have that feature set.
> 
> OK.  However, LilyPond's Emmentaler font (containing musical glyphs)
> also provides various design sizes and would be a good candidate.
> 
>> At any rate, it can easily go into Fontconfig.  We just need to add
>> an element for design size, perhaps one for the design range,
>> possibly for design name, and then make the matcher match the font
>> with design size closest to requested size...
> 
> If I have understood correctly how the `size' feature works, it goes
> one step further: Let's assume that I request emmentaler-13 while
> using 19pt, and emmentaler-18 covers the range 17pt<=size<20pt.  After
> applying the `size' feature, the application will use emmentaler-18.
> BTW, XeLaTeX supports this, and the `fontspec' package for XeLaTeX
> provides a nice emulation interface of it.

Why would you request 'emmentaler-13'?  I assume the fonts have the same
Preferred Family name.  So you request by family name and size, and fontconfig
gives you the right one.

behdad

> Would this possible with fontconfig also?