Iterate over boundaries linearly in distortion update

GalSim-developers / GalSim

The modular galaxy image simulation toolkit. Documentation:

http://galsim-developers.github.io/GalSim/

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Iterate over boundaries linearly in distortion update #1137

Closed jamesp-epcc closed 2 years ago

jamesp-epcc commented 2 years ago

This PR modifies the distortion update to iterate over the pixel boundaries linearly instead of per-pixel as before. This speeds up the tests by around 15% and simplifies the code.