ccitt: speed up the highBits function

Also fix s/PackBits/HighBits/ typos in reader_test.go.

name        old time/op  new time/op  delta
HighBits-4  34.8µs ± 2%  11.0µs ± 1%  -68.45%  (p=0.008 n=5+5)

Change-Id: Id5af14536edb66c5313b6fcf711872e5025cb503
Reviewed-on: https://go-review.googlesource.com/c/image/+/191941
Run-TryBot: Nigel Tao <nigeltao@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Horst Rutter <hhrutter@gmail.com>
Reviewed-by: Benny Siegert <bsiegert@gmail.com>
2 files changed
tree: 243f4326e5cee92d912dee65aeeb55f0a81cdc70
  1. .gitattributes
  2. .gitignore
  3. AUTHORS
  4. CONTRIBUTING.md
  5. CONTRIBUTORS
  6. LICENSE
  7. PATENTS
  8. README.md
  9. bmp/
  10. ccitt/
  11. cmd/
  12. codereview.cfg
  13. colornames/
  14. draw/
  15. example/
  16. font/
  17. go.mod
  18. go.sum
  19. math/
  20. riff/
  21. testdata/
  22. tiff/
  23. vector/
  24. vp8/
  25. vp8l/
  26. webp/
README.md

Go Images

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