Cleanup SkPackedGlyphID

Simplify lengths, positions and masks. The old code used to support
both unicode, and SkGlyphIDs; unicode support is not needed since
unicode->glyphID translation was moved to the typeface. Change the
glyph id field from 24 bits to 16.

Change-Id: I28524870c97a441159c5b00acfc2c43834924c8e
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/240280
Commit-Queue: Herb Derby <herbderby@gmail.com>
Reviewed-by: Jim Van Verth <jvanverth@google.com>
1 file changed