Re: Using a custom bitmap as a character?

[Jean Abou Samra]

Le mercredi 23 août 2023 à 11:40 +0000, Werner LEMBERG a écrit :
> > I am slowly creating a font to be used for tablature ... so far I
> > have bitmaps of a couple of characters.  I'd like to try them out
> > and get an idea how they look.  Is there any way I can replace a
> > character with a small scaled bitmap?
> 
> Not directly.  You would have to convert the bitmap to an EPS file,
> say.  You might try potrace to do such a conversion.
> 
>   https://potrace.sourceforge.net/
> 
> The FontForge font editor comes with native support for potrace, BTW.


The tool looks quite impressive. OTOH, in 2.25, there's \image to use
a PNG file, so you don't necessarily need to convert the bitmap to a
vector graphics form.

If the goal is just to test the glyphs (and not to automate the use of
these bitmaps in a large tablature score), I'd just get them in PNG
format if not already the case, and do something like

\version "2.25.7"

\new TabStaff {
  \once \override TabNoteHead.stencil =
    #(lambda (grob)
       (grob-interpret-markup
        grob
        #{ \markup \image #X #2 "/path/to/image.png" #}))
  c'
}

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