font/sfnt: support cmap format 6

The library provides support for CMap formats 2, 4 and 12, but
does not support CMap format 6.

CL adds support for CMap format 6 (trimmed table mapping).

Change-Id: I40657c4805c14017367af17596023da96b2c7483
Reviewed-on: https://go-review.googlesource.com/c/146079
Reviewed-by: Nigel Tao <nigeltao@golang.org>
Run-TryBot: Nigel Tao <nigeltao@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
1 file changed
tree: 61113b567b48745567ad3d9641ea1d0b3caafc5a
  1. bmp/
  2. cmd/
  3. colornames/
  4. draw/
  5. example/
  6. font/
  7. math/
  8. riff/
  9. testdata/
  10. tiff/
  11. vector/
  12. vp8/
  13. vp8l/
  14. webp/
  15. .gitattributes
  16. .gitignore
  17. AUTHORS
  18. codereview.cfg
  19. CONTRIBUTING.md
  20. CONTRIBUTORS
  21. LICENSE
  22. PATENTS
  23. README.md
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