font/sfnt: implement Font.GlyphBounds

Updates golang/go#30699

Font.GlyphBounds returns the glyph's bounding box and advance as
expected by the GlyphBounds method of the font.Face interface.

Change-Id: Iaee8b6d88afc48f21d00bf84219b99f993b3ab9a
Reviewed-on: https://go-review.googlesource.com/c/image/+/166477
Reviewed-by: Nigel Tao <nigeltao@golang.org>
4 files changed
tree: 32cf46d530497386bb827fb0470f26a015fdc137
  1. bmp/
  2. ccitt/
  3. cmd/
  4. colornames/
  5. draw/
  6. example/
  7. font/
  8. math/
  9. riff/
  10. testdata/
  11. tiff/
  12. vector/
  13. vp8/
  14. vp8l/
  15. webp/
  16. .gitattributes
  17. .gitignore
  18. AUTHORS
  19. codereview.cfg
  20. CONTRIBUTING.md
  21. CONTRIBUTORS
  22. go.mod
  23. go.sum
  24. LICENSE
  25. PATENTS
  26. README.md
README.md

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