tree 76ad93e09377fc5a4dcb93e63992fcf55c21634f
parent 5387c83f819ab9c138e8669ae60811b9b5967d0f
author senorblanco <senorblanco@chromium.org> 1408996018 -0700
committer Commit bot <commit-bot@chromium.org> 1408996018 -0700

Fix recursive computation of filter bounds for drop shadow,
morphology, blur.

[Reland with fixed tests.]

Because we're computing "backwards" from a clip rect of destination
pixels to be filled to the required source pixels, we should use tail
recursion rather than head recursion in onFilterBounds().

This actually only makes a difference for drop-shadow, where
the computation is non-commutative. Blur and morphology commute, but I
moved them to tail recursion anyway for clarity (so all onFilterBounds
use tail recursion).

BUG=skia:
R=bsalomon@google.com

Author: senorblanco@chromium.org

Review URL: https://codereview.chromium.org/481273005