issue 5307: Skyline Refinements (Rounded Boxes and Rotated Ellipses) (issue 341140043 by address@hidden)

[torsten . haemmerle]

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Message:
Please review...

Thanks
Torsten

Description:
issue 5307: Skyline Refinements (Rounded Boxes and Rotated Ellipses)

lily/stencil-integral.cc

function make_partial_ellipse_boxes:

Use correct scaling factors for x_rad and y_rad for an arbitrary
transformation matrix
This affects calculation of quantisation value

function make_round_filled_box_boxes:

(1) remove unintentional additional space between box and skyline

(2) In case of rounded corners (threshold: diameter > 0.5 staff spaces)
    or rotation, a detailed skyline will be constructed.
    Rotated straight lines are drawn using buildings.
    Rounded corners built out of boxes (cf. ellipse).

(3) Draw simple single-box skyline for simple boxes (i.e. in most cases,
    e.g. ledger lines).

Please review this at https://codereview.appspot.com/341140043/

Affected files (+145, -13 lines):
  M Documentation/changes.tely
  A input/regression/skyline-boxes-ellipses.ly
  M lily/stencil-integral.cc