tree f2f228bad8cd605fa085b0b8293448ef36857741
parent e5db4c466346ada62f27934dab20e4b6f6bda285
author Jiulong Wang <jiulongw@gmail.com> 1513106568 -0800
committer Nigel Tao <nigeltao@golang.org> 1513291916 +0000

draw: fix crash caused by Scale by Copy shortcut

When DstMask is not nil, this shortcut causes stack overflow because
Copy function in turn will call Scale with same dr and sr.

Fixes golang/go#23107

Change-Id: I8ccadbd9b7f16363ac17b6114308527d6fa9456e
Reviewed-on: https://go-review.googlesource.com/83537
Reviewed-by: Nigel Tao <nigeltao@golang.org>
Run-TryBot: Nigel Tao <nigeltao@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>