Fix mapping from src to dst image space in SkAlphaThresholdFilter
This CL does 3 things:
It updates the imagealphathreshold GMs so they would've caught this bug
It updates SkAlphaImageThresholdFilter to fix the bug
It updates the imagealphathreshold_surface GM to match the imagealphathreshold_crop GM (which it was, presumably, originally written to do)
The bug in question is that the prior mapping from src to dst space was correct as long as the imageOffset was (0, 0).
BUG=675332
Change-Id: I3aa1f463a2234576fb2277797caa2fc4aba2650d
Reviewed-on: https://skia-review.googlesource.com/6291
Reviewed-by: Brian Osman <brianosman@google.com>
Reviewed-by: Stephan White <senorblanco@chromium.org>
Commit-Queue: Robert Phillips <robertphillips@google.com>
2 files changed
