What is the situation with SanSerif fonts? Serifs may turn to spikes
at low resolutions. This is problematic for the emboldener.
If SanSerifs are better, try -0xDDB4 on ftoutln.c:978. This will more
aggressively reject 150-degree or sharper spikes.
http://postimg.org/image/nuivug5l7
Gamma: 1.8
Top row: git master, no emboldening.
Bottom row: emboldening (default CFF parameters, lower size limit
4ppem), your safe guard and -0xDDB4.
Still ugly.
You can experiment yourself if you want to, clone my branch and do e.g.
"LD_PRELOAD=objs/.libs/libfreetype.so ftview 16
/usr/share/fonts/dejavu/DejaVuSerif.ttf"
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