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93104fb4fc4361d75a3249a804a904db0d54a72a
Check whether finger is still on the screen. If not, we couldn't determine where the user has touched. It's better to return early rather than give garbage values. A more sensitive solution might be caculate the position once the interrupt occured. But it's not anti-shake friendly. git-svn-id: https://rt-thread.googlecode.com/svn/trunk@1789 bbd45198-f89e-11dd-88c7-29a3b14d5316
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