tree 9e47f5c322659a129d66a7e8b8b111169981b108
parent 6c4e71a5d65419c9978706081211dbe88e30e4b5
author commit-bot@chromium.org <commit-bot@chromium.org@2bbb7eff-a529-9590-31e7-b0007b416f81> 1384983147 +0000
committer commit-bot@chromium.org <commit-bot@chromium.org@2bbb7eff-a529-9590-31e7-b0007b416f81> 1384983147 +0000

Fix SkMatrix44::invert(...) for identity matrices and a NULL parameter

Currently, to check if an SkMatrix44 is singular, we call ::invert(NULL) and
check the result. Usually this does no more work than is necessary. One
case where we do far too much work is if |this| is an identity matrix. In
this case, we do not early out and compute a (partial) determinant (we don't
do the full shebang because there are no perspective components).

BUG=None
R=ajuma@chromium.org, reed@google.com

Author: vollick@chromium.org

Review URL: https://codereview.chromium.org/79333002

git-svn-id: http://skia.googlecode.com/svn/trunk@12327 2bbb7eff-a529-9590-31e7-b0007b416f81