contour-rs

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I want to be able to generate contours that do not include lines on data/nodata borders, 'nodata' being any value either outside the grid or a specifically chosen one inside of it, commonly f32::MAX or f64::MAX, e.g. (nodata marked red): Without nodata handling:

With nodata handling:

This also prevents a ring forming around the whole dataset, as seen in https://github.com/mthh/contour-rs/issues/7. While I'm aware of the workaround proposed in the issue, it is not sufficiently performant for me. I started implementing this feature here: https://github.com/SenseLabsDE/contour-rs/tree/nodata, but the current version is relatively inefficient and results in slowdowns even if the feature is unused.

Yes, these are two totally valid use cases that should be supported by this library.

I think it would also be an opportunity to properly support the presence of NaN and (NEG_)INFINITY in the entry grid.