Add curve filter. (no resource images are required)#229

Open

wysaid wants to merge 2 commits intowasabeef:masterfrom

Commits on Nov 23, 2015

[update by wysaid] Add curve filter. After this commit, the curve filter would not need resource images input any more. The curve algorithm is based on Catmull-Rom Spline
wysaid
committed
fix: The view covers the intensity-adjust slider. The zOrderOnTop attrib is not neccessary.
wysaid
committed