http://bugs.winehq.org/show_bug.cgi?id=24653
--- Comment #5 from Vincent Povirk madewokherd@gmail.com 2010-11-09 14:44:53 CST --- This stuff needs a rewrite anyway due to SetPixelOffsetMode and a general need to render things in software in many cases (including while smoothing is enabled).
There is so much work to do in gdiplus that I can't justify taking the time to squint at pixels and your code and try to figure out what's going on. If you want to write simple, automated test cases (preferably in the form of a wine patch that edits the test suite) that illustrate specific problems, I might have a go at fixing them.