-
-(define pure-print-callbacks
- (list
- `(,ly:note-head::print . '())
- `(,ly:clef::print . '())
- `(,ly:text-interface::print . '())
- `(,ly:script-interface::print . '())))
-
-;; ly:grob::stencil-extent is safe iff the print callback is safe too
-(define (pure-stencil-height grob start stop)
- (let ((sten (ly:grob-property-data grob 'stencil)))
- (if (or
- (ly:stencil? sten)
- (pair? (assq sten pure-print-callbacks)))
- (ly:grob::stencil-height grob)
- '(0 . 0))))
-
-(define pure-Y-extents
- (list
- `(,ly:staff-symbol::height . ())))
-
-(define Y-extent-conversions
- (list
- `(,ly:stem::height . ,ly:stem::pure-height)
- `(,ly:grob::stencil-height . ,pure-stencil-height)
- `(,ly:side-position-interface::y-aligned-side . ,ly:side-position-interface::pure-y-aligned-side)
- `(,ly:axis-group-interface::height . ,ly:axis-group-interface::pure-height)
- `(,ly:hara-kiri-group-spanner::y-extent . ,ly:hara-kiri-group-spanner::pure-height)
- `(,ly:slur::height . ,ly:slur::pure-height)))
-
-(define pure-Y-offsets
- (list
- `(,ly:staff-symbol-referencer::callback . ())))
-
-(define Y-offset-conversions
- (list
- `(,ly:side-position-interface::y-aligned-side . ,ly:side-position-interface::pure-y-aligned-side)))
-
-(define-public (pure-relevant grob)
- (let ((extent-callback (ly:grob-property-data grob 'Y-extent)))
- (or
- (pair? extent-callback)
- (pair? (assq extent-callback pure-Y-extents))
- (and
- (pair? (assq extent-callback Y-extent-conversions))
- (or
- (not (eq? extent-callback ly:grob::stencil-height))
- (pair? (assq (ly:grob-property-data grob 'stencil) pure-print-callbacks))
- (ly:stencil? (ly:grob-property-data grob 'stencil)))))))
-
-(define (pure-conversion pures conversions defsymbol defreturn rettype? grob start stop)
- (let* ((normal-callback (ly:grob-property-data grob defsymbol))
- (pure-callback (assq normal-callback conversions)))
- (if (rettype? normal-callback)
- normal-callback
- (if (pair? (assq normal-callback pures))
- (normal-callback grob)
- (if (pair? pure-callback)
- ((cdr pure-callback) grob start stop)
- defreturn)))))
-
-(define-public (pure-Y-extent grob start stop)
- (pure-conversion pure-Y-extents Y-extent-conversions
- 'Y-extent '(0 . 0) pair? grob start stop))
-
-(define-public (pure-Y-offset grob start stop)
- (pure-conversion pure-Y-offsets Y-offset-conversions
- 'Y-offset 0 number? grob start stop))