morph: fix regressions after Highway implementation #4240
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Previously, `seq->coff` was used both for storing offsets to clear values (zero values in masks) and as an array for non-128 mask coefficients. However, in commit 40e2884 (PR libvips#3618), `seq->coff` was restricted to `guint8` values, making it incompatible for storing offsets. Fix this by syncing the C-paths with the Highway implementation.
`~p` and `p ^ 255` produce the same result on uchar images, as XOR affects only the lowest 8 bits.
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Great! The nip and libvips tests passed, I'll look at expanding them to catch things like this. |
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Context: lovell/sharp#4243.
Test case
Targets the 8.16 branch.