maintain the page index in AtlasLocator
AtlasLocator maintains the page index, and atlas location in fUVs.
This reduces the number of instructions needed to produce the
glyphs vertices. Moving the page index to the high bits allows many
simplifications to the code because subtraction can be used to
calculate width and height, and small offsets can be added with
no re-encoding.
Change-Id: I592543f772274dd18e00c0aec2520aadb1bf4158
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/314317
Reviewed-by: Jim Van Verth <jvanverth@google.com>
Commit-Queue: Herb Derby <herb@google.com>
4 files changed