Bug in pisces Stroker (div by zero)
Mark Wielaard
mark at klomp.org
Fri Nov 21 13:51:54 PST 2008
Hi,
There is a bug in the pisces Stroker in finish(). When ldx and ldy are
so small (zero) that lineLength() will return zero, then you will get a
div by zero exception.
You can see this with for example this webstart application (you will
need to have IcedTeaWebstart [netx] installed):
http://linuxhippy.blogspot.com/2008/11/jgears2-rendermark.html
java.lang.ArithmeticException: / by zero
at sun.java2d.pisces.Stroker.finish(Stroker.java:698)
at sun.java2d.pisces.Stroker.close(Stroker.java:592)
at sun.java2d.pisces.PiscesRenderingEngine.pathTo(PiscesRenderingEngine.java:248)
at sun.java2d.pisces.PiscesRenderingEngine.strokeTo(PiscesRenderingEngine.java:231)
at sun.java2d.pisces.PiscesRenderingEngine.strokeTo(PiscesRenderingEngine.java:181)
at sun.java2d.pisces.PiscesRenderingEngine.strokeTo(PiscesRenderingEngine.java:145)
at sun.java2d.pipe.LoopPipe.getStrokeSpans(LoopPipe.java:274)
at sun.java2d.x11.X11Renderer.draw(X11Renderer.java:343)
at sun.java2d.pipe.ValidatePipe.draw(ValidatePipe.java:154)
at sun.java2d.SunGraphics2D.draw(SunGraphics2D.java:2392)
at JGears2.renderShape(JGears2.java:244)
[...]
Attached is the workaround that I checked into IcedTea to make this work
reliably:
2008-11-21 Mark Wielaard <mark at klomp.org>
* patches/icedtea-stroker-finish.patch: New patch.
* Makefile.am (ICEDTEA_PATCHES): Add new patch.
* HACKING: Document new patch.
Cheers,
Mark
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