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** [issues:#5951] Calculate skylines only once.**
**Status:** Started
**Created:** Fri May 01, 2020 05:52 PM UTC by Han-Wen Nienhuys
**Last Updated:** Fri May 01, 2020 05:52 PM UTC
**Owner:** nobody
Before, Axis_group_interface::skyline_spacing() would call the
function add_interior_skylines(), which recursed into
VerticalAxisGroups. This caused staff-skylines to be computed twice:
once as part of the Staff's VerticalAxisGroup, and once to compute
the skyline for System.
Instead, in Axis_group_interface::skyline_spacing(), compute the
vertical-skylines for all constituent elements. Since the property is
subject to caching, the Staff skyline is only computed once.
To make this work
* Add flags to the NoteColumn using Axis_group_interface::add_element
* add vertical-skylines callbacks for NoteColumn and
NoteCollision, which are also X,Y Axis groups.
* declare add-stem-support for bass figures (or the digits are meshed
in with stems that stick out of the staff.)
* calculate a skyline for BassFigureAlignment, otherwise, the skyline
is computed from the extent of the alignment, which is inaccurate if
some bass figures have accidentals.
Formatting impact:
* ottava-edge.ly - the ottava bracket meshes better with the stem,
leading to tighter spacing.
Timing impact
ac49229cdf - Calculate skylines only once.
baseline: eaf40071f5 Use vectors rather than lists for skylines.
args: -I carver MSDM
memory: med diff 1916 (stddevs 103 135, n=5)
memory: med diff 0.2 % (ac49229cdf is fatter)
time: med diff -0.37 (stddevs 0.08 0.14, n=5)
time: med diff -0.8 % (ac49229cdf is faster)
https://codereview.appspot.com/553980043
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