fix(xanthous): Make floodFill faster
Speed up the floodFill algorithm by sprinkling in some strictness and specializing it to the only type it's currently called at anyway. Change-Id: I4557fc51b1c1036c127bfd5bee50748d8692ae74 Reviewed-on: https://cl.tvl.fyi/c/depot/+/555 Reviewed-by: glittershark <grfn@gws.fyi>
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@ -163,9 +163,11 @@ floodFill = go mempty
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(if y == maxBound then y else succ y)]
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in foldl' (\r idx' ->
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if arr ! idx'
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then r <> go (r & contains idx' .~ True) arr idx'
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then r <> (let r' = r & contains idx' .~ True
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in r' `seq` go r' arr idx')
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else r)
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(res & contains idx .~ True) neighbors
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{-# SPECIALIZE floodFill :: UArray (Word, Word) Bool -> (Word, Word) -> Set (Word, Word) #-}
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-- | Gives a list of all the disconnected regions in a cell array, represented
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-- each as lists of points
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@ -188,6 +190,7 @@ regions arr
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where
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findFirstPoint :: a (i, j) Bool -> Maybe (i, j)
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findFirstPoint = fmap fst . headMay . filter snd . assocs
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{-# SPECIALIZE regions :: UArray (Word, Word) Bool -> [Set (Word, Word)] #-}
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fillAll :: (IArray a Bool, Ix i, Foldable f) => f i -> a i Bool -> a i Bool
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fillAll ixes a = accum (const fst) a $ (, (False, ())) <$> toList ixes
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