tree 9553e17887e52f51f072e35c480c27530eb3031f
parent 8b5ac8f8e598a62e443f4797fd70f6387ce04ab8
author Ethan Burns <eaburns@google.com> 1459613979 -0400
committer Nigel Tao <nigeltao@golang.org> 1460000789 +0000

plan9font: use image.Alpha for subface images.

image.Alpha is fast-pathed in draw.Draw, plan9Image is not.

Change-Id: I5ed8fc4d310bb5c6ec2cffdd0ba4295dae2274cf
Reviewed-on: https://go-review.googlesource.com/21453
Reviewed-by: Nigel Tao <nigeltao@golang.org>