fixed drawing point issue when this point is out of buffer dc.
git-svn-id: https://rt-thread.googlecode.com/svn/trunk@1719 bbd45198-f89e-11dd-88c7-29a3b14d5316
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git-svn-id: https://rt-thread.googlecode.com/svn/trunk@1719 bbd45198-f89e-11dd-88c7-29a3b14d5316