https://github.com/TortoiseGit/TortoiseGit/blob/master/src/Utils/MiscUI/WaterEffect.cpp
C#的实现：
http://cn.bing.com/search?q=WaterEffect+C%23&qs=n&form=QBRE&sp=-1&pq=watereffect+c%23&sc=0-14&sk=&cvid=298F89FDC7534EB0B2834C841F7E06A9
https://www.codeproject.com/Articles/2812/A-C-water-effect-picture-control
http://www.c-sharpcorner.com/UploadFile/5c2d70/creating-reflection-effect-in-wpf-expression-blend/