Custom read zero outside image

[haesleinhuepf]

Hey @grahamross123 ,

I eventually managed to look into #296 . Big thanks for working on this!

In this PR to your branch I add a custom read-function based on the original in the preamble. It returns 0 if the coordinates are outside the image.

I'm also adding some tests demonstrating that it now works like in skimage also on image borders.

I created an issue because the read-zero-outside thingy should be supported by the preamble, but is commented out. See #302

Let me know what you think! And thanks again!

Best,
Robert

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.07 🎉

Comparison is base (e972ab0) 92.95% compared to head (8c00111) 93.02%.

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Additional details and impacted files

@@                    Coverage Diff                    @@
##           morph_snake_smoothing     #301      +/-   ##
=========================================================
+ Coverage                  92.95%   93.02%   +0.07%     
=========================================================
  Files                        773      776       +3     
  Lines                      14237    14340     +103     
=========================================================
+ Hits                       13234    13340     +106     
+ Misses                      1003     1000       -3     

Impacted Files	Coverage Δ
pyclesperanto_prototype/_tier1/__init__.py	100.00% <100.00%> (ø)
...clesperanto_prototype/_tier1/_inferior_superior.py	100.00% <100.00%> (ø)
...clesperanto_prototype/_tier1/_superior_inferior.py	100.00% <100.00%> (+37.50%)	⬆️
tests/test_inferior_superior.py	100.00% <100.00%> (ø)
tests/test_superior_inferior.py	100.00% <100.00%> (ø)

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