commit 82afe4b44a1d5e0fddf92726be00c6fceefd5cc9
author jamesr@chromium.org <jamesr@chromium.org@0039d316-1c4b-4281-b951-d872f2087c98> Fri Nov 12 20:36:22 2010
committer jamesr@chromium.org <jamesr@chromium.org@0039d316-1c4b-4281-b951-d872f2087c98> Fri Nov 12 20:36:22 2010
tree 4c121eea6374e420008533b52aecf82fe48e6c3b
parent efb660512fdb54c4a07a65e4d9d6c4e7bbbe8e8c

Downsample thumbnail by powers of two before doing lanczos

This speeds up the resizing portion of thumbnailing from 40ms->15ms on my linux z600 at nearly fullscreen resolution.  Thumbnail resizing times on weaker hardware (like netbooks) has been observed in the 150ms+ range, so hopefully this is a proportional speedup there as well.

TEST=none
BUG=62820

Review URL: http://codereview.chromium.org/4846002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@65982 0039d316-1c4b-4281-b951-d872f2087c98