Radial symmetry lost during rasterization

The following SVG is essentially two circles centered on top of each
other.  It has radial symmetry.  However, when I rasterize this to a
16x16 image, I get something quite obviously lacking radial symmetry.
It appears as though things are shifted to the upper left toward
(0,0), and smells to me like an integer truncation issue.  If I
increase the raster dimensions, the problem becomes less pronounced,
and ultimately unnoticeable at higher resolutions (e.g. 512x512).  I
can likely work around this by rasterizing at high resolution and then
scaling down to my desired resolution.

This was with Batik 1.7, on with Oracle Java 1.6.0_22 and 1.6.0_29 on Windows 7.

For reference, Inkscape will export a raster that appears correct.

Regards,
Ryan Gustafson

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