Comment #34 on issue 2658 by [email protected]: 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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