Saturate subtract translation in SkOffsetImageFilter

Fuzzer has figured out it can overflow.

Bug: chromium:1268401
Change-Id: Ia25b8ab382a0ab868a3ca6dd9ea5f68f16d07504
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/471017
Auto-Submit: Brian Salomon <bsalomon@google.com>
Commit-Queue: Michael Ludwig <michaelludwig@google.com>
Reviewed-by: Michael Ludwig <michaelludwig@google.com>
1 file changed