tree df7daea5295de1dcbeeb72d34bd58cbc0a4ca3a9
parent 915187b71d4068f21a15a1b8f4d919e1179d8b74
author jvanverth <jvanverth@google.com> 1417813595 -0800
committer Commit bot <commit-bot@chromium.org> 1417813595 -0800

Add support for half float alpha textures.

This allows us to create distance field textures with better precision,
which may help text quality.

BUG=skia:3103

Review URL: https://codereview.chromium.org/762923003