Fast Hilbert

Fast Hilbert 2D curve computation using an efficient Lookup Table (LUT).

• Convert from discrete 2D space to 1D hilbert space and reverse
• Very fast using an efficient 512 Byte LUT
• No additional dependencies except for rust std lib.

Benchmarking with criterion shows that fast_hilbert is about 2.5 times faster compared to the fastest 2D hilbert transformation libs written in rust. Benchmarked on a Intel i5-6400 CPU @ 2.70 GHz, 4 Cores with 8 GB RAM:

| Library | Time | Description | ----------------- |-----------:| ----------------- | | fasthilbert | 30 ns | Optimized for fast computation in 2D discrete space using an efficient *LUT* | hilbert2d | 75 ns | Also allows other variants such as Moore and LIU | | hilbert_curve | 85 ns | Implements algorithm described on Wikipedia | | hilbert | 798 ns | Allows computation of higher dimensional Hilbert curves |