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Check for overflows that could happen with alignment and the
multiplication. The INT_MAX / 4 is somewhat approximate and assumes that
degenerate alignment values won't happen.
This still assumes that a possibly overflowing end_w/end_h calculation
doesn't make the compiler's optimizer destroy the overflow checks.
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Found by fuzzer test case id:000082,sig:11,src:002579,op:havoc,rep:8.
Correctness should be checked, but this fixes the overflow for good.
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This can improve perf somewhat with large bitmaps
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As before, this does not add any build system support:
a config.h file and a project must still be manually created
(or the compiler can be run manually instead of using a project).
Signed-off-by: Grigori Goronzy <greg@kinoho.net>
Signed-off-by: Oleg Oshmyan <chortos@inbox.lv>
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This way, #include "config.h" is consistently the very
first thing the compiler sees when compiling any file.
Some source files currently don't use anything defined in config.h,
but it's easier and less error-prone to include it now to anticipate
possible future changes in those files, config.h or other headers.
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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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