use float -> float math functions

  double foo(double) --> float foof(float)
  If you prefer, I think std::foo would work too.

  Rename src to field to match the new macro.

Change-Id: I61ca11d6bc1fc8cb90004b72429b3941007cd5d8
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/215143
Reviewed-by: Ethan Nicholas <ethannicholas@google.com>
Commit-Queue: Mike Klein <mtklein@google.com>
1 file changed