Fix Paeth Filter decode on platforms that do not support Ssse3

SixLabors / ImageSharp

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Closed JimBobSquarePants closed 9 months ago

JimBobSquarePants commented 9 months ago

[x] I have written a descriptive pull-request title
[x] I have verified that there are no overlapping pull-requests open
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[x] I have provided test coverage for my change (where applicable)

Fixes #2617

cmeeren commented 9 months ago

Just to check, did you intend to name it Ssse3 (three s-es?) I see it was Sse2 (two s-es). I don't know these terms, though.

JimBobSquarePants commented 9 months ago

Just to check, did you intend to name it Ssse3 (three s-es?) I see it was Sse2 (two s-es). I don't know these terms, though.

Yes, the method uses the Abs intrinsic from Supplemental Streaming SIMD Extensions 3 (Ssse3)