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This commit removes prefilters altogether at the cost of
enlarged main filter kernel.
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That's complete version with SSE2/AVX2 assembly.
Should be much faster than old algorithm even in pure C.
Algorithm description can be found in this article (PDF):
https://github.com/MrSmile/CascadeBlur/releases
Close #9
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Use one pointer to table of functions instead of scattered
bunch of function pointers. Different versions of these tables
can be constructed in compile time.
Also, bitmap memory alignment now depends only on SSE2/AVX2 support
and is constant for every width. That simplifies code without
noticeable performance penalty.
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