Re: Changing how a font style is requested

[Alexander Kobel]

Hi all,

since I could not find anything suitable to solve the issue described 
below, I decided to write a little patch.  Please have a look at

    https://codereview.appspot.com/108700043

and tell me what you think about it.

[ BTW: This might or might not be entirely orthogonal to the music font 
selection methods which are debated about currently, in the sense that 
the feta font loader is hard-coded and built-in into 
make-pango-font-tree and the proposed make-expert-font-tree.  Sorry, I 
did not follow those discussions in detail; but if you think that's a 
good time to integrate music font selection as well, please go ahead. ]

I could not see a way to achieve what I need in user-level Scheme, since 
add-font is not exposed publicly (and probably for a good reason).  I'm 
happy to take comments on functionality and coding style; I will write a 
bit of documentation in addition to the regtest once (if?) you deem the 
interface acceptable.

I hope goals and syntax are somewhat self-explaining; otherwise, feel 
free to ask for further explanations.  I barely added syntactic sugar 
(except the default font scale 1.0), but I'm willing to reconsider the 
input syntax to make-expert-font-tree if you have any better ideas. 
However, a front-end to it should be much more easy to write, and this 
is doable in user-level code.


Thanks in advance,
Alexander


On 07/11/2014 11:59 AM, Alexander Kobel wrote:
> Dear all,
>
> I like to use the Romande ADF font family [1] in one of my scores. I do
> the usual rule-of-three with
>
>    \paper { ... (make-pango-font-tree
>                  "Romande ADF No2 Std" "Romande ADF Std" "monospace"
>                  (/ myStaffSize 20)) ... }
>
> (If you wonder, No2 is condensed, and the non-condensed version, used in
> the headers, is mapped to sans for easy access.)
>
> However, here's the catch: Romande does offer a bold variant, but it
> announces it as "DemiBold" instead of "Bold", according to fc-list. I
> know that I can switch to the different font each time I need bold, but
> that's an utter nuisance.
> Is there any way to tell Lily how to choose a bold variant? Bonus points
> if it only applies to a specific, say, the serif font. Or, <wishlist to
> follow>, if it is possible to define a mapping similar to
>
>    myserif = { regular:     # default
>                             "Romande ADF No2 Std:style=Regular",
>                bold:        # choose way of selecting bold
>                             "Romande ADF No2 Std:style=DemiBold",
>                italic:      # pretend I don't like Romande's italics
>                             # and need to scale some other font to match
>                             "Gentium:style=Italic:scaling=0.93",
>                bold-italic: # use small caps family instead
>                             "Romande ADF Style Std:style=Regular" }
>    ...
>    \paper { #(define fonts (myserif mysans mymono (/ myStaffSize 20)) }
>
> Obviously, that's not Lily's syntax, but you get the point...
>
>
> Thanks in advance,
> Alexander
>
>
> [1] http://arkandis.tuxfamily.org/adffonts.html
>
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