font/opentype: implement font.Face interface

This CL adds the type Face that implements the font.Face interface.
This CL also adds tests using gofont/goregular as an input font, using
github.com/golang/freetype/truetype as reference values.

Updates golang/go#22451.

Change-Id: I2a6945309331b251ec2ddec95b6e809ad10aa116
Reviewed-on: https://go-review.googlesource.com/73870
Reviewed-by: Nigel Tao <nigeltao@golang.org>
3 files changed
tree: c419a24ea60f75ae365dc7d7dc114558cd5d1e34
  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
README.md

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