Reduce redundant code in drivers (we can unvirtualize stuff as speed requires after implementation is complete)
Fix some color handling for 15/16 bit. Implement HLine functions for BitmapDriver. I forget what I did to Clipper. git-svn-id: file:///srv/svn/repos/haiku/trunk/current@5243 a95241bf-73f2-0310-859d-f6bbb57e9c96
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