Libart is known to have a lot of problems concerning numerical
stability. These problems can come from two separate issues:
Libart uses floats to represent an manipulate user-data.
Floating-point arithmetics are known to lack numerical
stability sometimes. Some problems are thus to be expected.
The libart intersector (the code used to transform vpaths into
svps) is known to have some bugs. Fixing those requires a lot of
work and a careful re-design/re-write of the intersector. Till then,
Raph has not had time to fix them. Also, no one volunteered to fix
them. If you have some time left on weekends and are interested in this
task, please contact Raph (raph at acm dot org).
Despite these problems, libart can still be used for production use: these bugs
manifest themselves in small drawing glitches which can be avoided by sparsely using