The dFdx, dFdy functions appear to become less accurate as the
distortion in a given transform increases. We could possibly counteract
this by passing in the inverse of the transform, but this is taking the
small path renderer well past its original intended use, which is for
rendering small paths, and icons in particular, with similarity
transformations.
Bug: skia:11910
Change-Id: Ib7bf0d02925e9930583adb628501706831e73183
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/402579
Commit-Queue: Jim Van Verth <jvanverth@google.com>
Reviewed-by: Michael Ludwig <michaelludwig@google.com>
12935777a6