because they'll be used for both sprites and animations.
git-svn-id: svn+ssh://src.earth.threerings.net/narya/trunk@1692 542714f4-19e9-0310-aa3c-eee0fc999fb1
exactly big enough to accomodate all of their trimmed components and no
bigger.
git-svn-id: svn+ssh://src.earth.threerings.net/narya/trunk@1501 542714f4-19e9-0310-aa3c-eee0fc999fb1