From: Paul Davis <paul@linuxaudiosystems.com>
Date: Wed, 8 Jan 2014 23:20:19 +0000 (-0500)
Subject: prevent Rect::expand() from generating negative coordinates where there were none... 
X-Git-Tag: 1.0.0~981
X-Git-Url: https://main.carlh.net/gitweb/?a=commitdiff_plain;h=5cd35de56b26552200d4898c714937cb353b940b;p=ardour.git

prevent Rect::expand() from generating negative coordinates where there were none before
---

diff --git a/libs/canvas/types.cc b/libs/canvas/types.cc
index 7d7a495df5..9d8ed05622 100644
--- a/libs/canvas/types.cc
+++ b/libs/canvas/types.cc
@@ -95,8 +95,8 @@ Rect
 Rect::expand (Distance amount) const
 {
 	Rect r;
-	r.x0 = x0 - amount;
-	r.y0 = y0 - amount;
+	r.x0 = max (0.0, x0 - amount);
+	r.y0 = max (0.0, y0 - amount);
 	r.x1 = safe_add (x1, amount);
 	r.y1 = safe_add (y1, amount);
 	return r;