Re: Specific Lyric and CHordname font size

[Kieren MacMillan]

Hi Walt,

> Is it possible to set a specific chordname and lyric font size?  I see that 
> \markup can specify an abs font size.  I think I'm close with using font size 
> #3.5 to get to a 16pt font for example. Is that the only say to specify font 
> size in Chords - as a multiple of the global size?

That’s the only way using built-in functions… However, here’s a function I use 
which allows me to set any grob font-size by absolute font size:

%%%  SNIPPET BEGINS
\version "2.24.4"

allowGrobCallback =
#(define-scheme-function (parser location syms) (symbol-list?)
   (let ((interface (car syms))
         (sym (cadr syms)))
     #{
       \with {
         \consists #(lambda (context)
                      `((acknowledgers .
                          ((,interface . ,(lambda (engraver grob 
source-engraver)
                                            (let ((prop (ly:grob-property grob 
sym)))
                                              (if (procedure? prop) 
(ly:grob-set-property! grob sym (prop grob)))
                                              ))))
                          ))
                      )
       }
     #}))

absFontSize =
#(define-scheme-function (parser location pt)(number?)
   (lambda (grob)
     (let* ((layout (ly:grob-layout grob))
            (ref-size (ly:output-def-lookup (ly:grob-layout grob) 
'text-font-size 12)))
       (magnification->font-size (/ pt ref-size))
       )))

\layout {
  \context {
    \Score
    \allowGrobCallback font-interface.font-size
  }
}

\markup {
  "default font size:" C
  \hspace #2
  \fontsize #2 { "\fontsize #2:" C }
  \hspace #2
  \abs-fontsize #16 { "\abs-fontsize #16:" C }
}

ch = \chordmode { c }

\score {
  <<
    \new ChordNames {\ch }
    \new Lyrics \lyricmode { "default lyric size: " C  }
  >>
}

\score {
  \layout {
    \context {
      \ChordNames
      \override ChordName.font-size = #3.5
    }
    \context {
      \Lyrics
      \override LyricText.font-size = #3.5
    }
  }
  <<
    \new ChordNames {\ch }
    \new Lyrics \lyricmode { "LyricText.font-size = #3.5: " C  }
  >>
}

\score {
  \layout {
    \context {
      \ChordNames
      \override ChordName.font-size = \absFontSize #16
    }
  }
  <<
    \new ChordNames {\ch }
    \new Lyrics \lyricmode { "LyricText.font-size = #3.5: " C  }
  >>
}
%%%  SNIPPET ENDS

See <https://lists.gnu.org/archive/html/lilypond-user/2024-09/msg00023.html> 
[and the rest of that thread] if you’re interested in a deeper dive on the 
whole “absolute font sizes in Lilypond” issue…

Hope this helps!
Kieren.
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