tree f98169b7d8ef015d033367bb714ef2e2e61557fe
parent 67c770d218f41829dd283ff7993b04cbce136e84
author Nigel Tao <nigeltao@golang.org> 1428635120 +1000
committer Nigel Tao <nigeltao@golang.org> 1428644426 +0000

draw: clamp kernel output so red, green and blue <= alpha.

The raw computation can produce red > alpha when some weights are
negative.

Change-Id: Ic6701354770f012d3ef21a390a8400e14e9d1e25
Reviewed-on: https://go-review.googlesource.com/8740
Reviewed-by: Rob Pike <r@golang.org>