void GetSimpleDerivatives(const std::vector<synfig::Point> &f, int left, int right,
std::vector<synfig::Point> &df, int outleft,
- const std::vector<synfig::Real> &di)
+ const std::vector<synfig::Real> &/*di*/)
{
int i1,i2,i;
int offset = 2; //df = 1/2 (f[i+o]-f[i-o])