LyricHyphen whiteout
Issue 5033
A proper outline whiteout
would be ideal, but it is
not currently implemented.
The current code fails
because you need a relatively
large whiteout area for a
small object.
A brute force fix is to increase
the number of iterations, but
the result would be a pdf with
a high percentage of whiteout code.
There is the case where a long
melisma produces a single hyphen
event that generates a lot of
hyphens that cross a number of
mensuration lines.
Rectangular or roundedbox whiteout
will produce gaps in all
mensuration lines crossed, even
if there is no collision.
That's not acceptable.
http://codereview.appspot.com/312530043
---
** [issues:#5033] LyricHyphen whiteout**
**Status:** Started
**Created:** Mon Jan 16, 2017 01:13 PM UTC by Knut Petersen
**Last Updated:** Sat Mar 04, 2017 06:11 PM UTC
**Owner:** Knut Petersen
**Attachments:**
-
[0001-Special-whiteout-code-for-the-LyricHyphen-grob.patch](https://sourceforge.net/p/testlilyissues/issues/5033/attachment/0001-Special-whiteout-code-for-the-LyricHyphen-grob.patch)
(4.0 kB; text/x-patch)
-
[WhiteoutEvenBetter-A.jpg](https://sourceforge.net/p/testlilyissues/issues/5033/attachment/WhiteoutEvenBetter-A.jpg)
(39.7 kB; image/jpeg)
-
[WhiteoutEvenBetter-B.jpg](https://sourceforge.net/p/testlilyissues/issues/5033/attachment/WhiteoutEvenBetter-B.jpg)
(23.0 kB; image/jpeg)
-
[WhiteoutImproved.jpg](https://sourceforge.net/p/testlilyissues/issues/5033/attachment/WhiteoutImproved.jpg)
(42.6 kB; image/jpeg)
-
[WhiteoutOrig.jpg](https://sourceforge.net/p/testlilyissues/issues/5033/attachment/WhiteoutOrig.jpg)
(47.6 kB; image/jpeg)
Whiteout for LyricHyphen grobs is seldom used - obviously the hyphen must not
whiteout parts of the lyric syllables. But it is a vital feature if mensuration
lines are used (old music, Distler, ...)
A proper outline whiteout would be ideal, but it is not implemented ... the
current code fails because you need a relatively large whiteout area for a
small object. A brute force fix is to increase the number of iterations, but
the result would be a pdf with a high percentage of whiteout code.
And there is the case where a long melisma produces a single hyphen event that
generates a lot of hyphens that cross a number of mensuration lines.
Rectangular or roundedbox whiteout will produce gaps in all mensuration lines
crossed, even if there is no collision. That's not acceptable.
Attached is a patch that solves the problem. It passes a full make, and make
check does not identify any problem.
WhiteoutOrig.jpg: Current code
WhiteoutImproved.jpg: Brute-force-fix - more than 90% whiteout code in the pdf
WhiteoutEvenBetter-X.jpg: Proposed behaviour as implemented in the attached
patch
---
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