J'ai fait un peu le ménage dans les définitions :
\version "2.20.0"
%%%%%%%%%%%%%%%%%%%%%% Defs hirondelles %%%%%%%%%%%%%%%%%%%%%%%%%%%
unit = \markup\with-dimensions-from \null
\combine\stencil
#(make-path-stencil
'(M 202.56 88.45
C 202.56 99.43 193.66 108.33 182.68 108.34
C 171.69 108.34 162.79 99.43 162.79 88.45
C 162.79 77.47 171.69 68.56 182.68 68.56
C 193.66 68.56 202.56 77.47 202.56 88.45
Z
M 153 126 L 267 126 M 182.5 12 L 182.5 114
M 156 88 L 231 88)
0.2 .08 .08 #f)
\combine\stencil
#(make-path-stencil
'(M 191.51 88.45
C 191.51 93.33 187.56 97.29 182.68 97.29
C 177.79 97.29 173.84 93.33 173.84 88.45
C 173.84 83.57 177.79 79.61 182.68 79.61
C 187.56 79.61 191.51 83.57 191.51 88.45
Z)
0.2 .08 .08 #t)
\with-color #white \stencil
#(make-path-stencil
'(M 191.5 88 L 174 88 M 182.5 79.5 L 182.5 97)
0.2 .08 .08 #f)
hirondBD = \markup \combine \rotate #-90 \unit \scale #'(1 . -1) \unit
hirondHD = \markup\rotate #90 \hirondBD
hirondHG = \markup\rotate #180 \hirondBD
hirondBG = \markup\rotate #270 \hirondBD
hirondelles = \markup\concat {
\override #'(baseline-skip . 0)
\right-column {
\translate #'(0 . -20.15)
\concat { \hspace #-.6 \hirondHG }
\vspace #16.07 \hirondBG
}
\hspace #117.65
\override #'(baseline-skip . 0)
\right-column {
\translate #'(0 . -20.15)
\concat { \hspace #-.6 \hirondHD }
\vspace #16.07 \hirondBD
}
}
gabarit = \markup\with-dimensions-from \null {
\combine
\with-color #red
\stencil #(make-path-stencil
'(M 0 1 L 137.7 1 L 137.7 -67.3 L 0 -67.3 Z) .2 1 1 #t)
\combine
\with-color #white
\stencil #(make-path-stencil
'(M 2 -1 L 135.7 -1 L 135.7 -65.3 L 2 -65.3 Z) .2 1 1 #t)
\with-color #red
\stencil #(make-path-stencil '(M 69 .5 L 69 -67) .5 1 1 #f)
}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
Cordialement,
Pierre