commit 109a6d5c08c078a110812628ea35aa2ca85c3489
author Stephen White <senorblanco@chromium.org> Fri Jan 29 09:08:44 2016 -0500
committer Stephen White <senorblanco@chromium.org> Fri Jan 29 09:08:44 2016 -0500
tree dc1797eb53fe7dbc5cfc4961bcc59dccbad67737
parent 3dbdb0f2e8d963afa7e6873c03614dac5d862f9f

Image filters: fix srcOffset handling in asFragmentProcessor() path.

[Cherry-pick of eae84c2e0e2126374cd488a1c8a3e18169145635 to M49 branch.]

Filters such as SkMatrixConvolutionImageFilter which use the
asFragmentProcessor() path were not correctly handling srcOffset.
It is correctly applied to the bounds, but the srcRect and dstRect
were computed from the pre-offset bounds.

The fix is to move them to just above where they're used in drawing.

Note: this change adds a new test case to the imagefiltersgraph GM,
so it will have to be rebaselined post-landing.

BUG=skia:4855,581389
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1637443003

NOTREECHECKS=true
NOTRY=true
NOPRESUBMIT=true
TBR=robertphillips@google.com

Review URL: https://codereview.chromium.org/1650433004 .