Re: [Lilypond-auto] Issue 2658 in lilypond: wrong stem rendering (inconsistent thickness)

[lilypond]

Comment #34 on issue 2658 by address@hidden: wrong stem rendering  
(inconsistent thickness)
http://code.google.com/p/lilypond/issues/detail?id=2658

What are you trying to tell me with that commit id?  The proposed code does  
not even issue a rectstroke.  Never.

It turns out that a rectstroke with rounded corners does not work well with  
strokeadjust set on Ghostscript: the resulting shape tends to have bumps at  
the corners.  Even without strokeadjustment on: a rectstroke will at least  
have a width of one pixel, so PostScript printers are _required_ to fatten  
a barline by (1-blotdiameter) pixels on average (and 0 to 2 pixels  
absolute) because of line thickness, and by another pixel (0 to 2 pixels  
absolute) when strokeadjustment is off.  When strokeadjustment is on, it  
adds 0 pixels on average but unfortunately -1 to 1 pixel absolute thickness  
since it works independently on left and right sides of a rectstroke.

The proposed code is very careful to use strokes as intended whenever  
possible.  For a rounded rectangle with a rounding diameter neither 0 nor  
maximum, strokeadjustment can't work directly, so the unadjusted shape is  
used as clip area and a rectangular adjusted stroke is drawn through it.

The results should exhibit quite less variation in thickness than the old  
code, actually even when strokeadjustment is turned off.  But the use of a  
clip area is something that not every previewer appears to be happy with.

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