ccpr: Normalize homogeneous coords with frexp/ldexp

Hopefully increases cubic accuracy by manipulating exponents
instead of calling normalize().

Bug: skia:
Change-Id: I8d3596e858a2fbb6650c158753133c5a2e01e166
Reviewed-on: https://skia-review.googlesource.com/117009
Reviewed-by: Brian Salomon <bsalomon@google.com>
Reviewed-by: Ethan Nicholas <ethannicholas@google.com>
Commit-Queue: Chris Dalton <csmartdalton@google.com>
5 files changed