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deflate_compress: tweak level 4 parameters

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Use a lower max_search_depth but a higher nice_match_length.  This seems
to turn out a bit better, on average.  This is consistent with what the
other compression levels do; level 4 was the only one that had
nice_match_length <= max_search_depth.
This commit is contained in:
Eric Biggers 2021-12-31 16:04:49 -06:00
parent 057cb92782
commit f699b697d6
1 changed files with 2 additions and 2 deletions
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4
lib/deflate_compress.c
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@ -2760,8 +2760,8 @@ libdeflate_alloc_compressor(int compression_level)
break; break;
case 4: case 4:
c->impl = deflate_compress_greedy; c->impl = deflate_compress_greedy;
c->max_search_depth = 24; c->max_search_depth = 16;
c->nice_match_length = 24; c->nice_match_length = 30;
break; break;
case 5: case 5:
c->impl = deflate_compress_lazy; c->impl = deflate_compress_lazy;