From c8be1e28e0dab3c7707242336d76350c2f2f19eb Mon Sep 17 00:00:00 2001
From: David Kastrup <dak@gnu.org>
Date: Mon, 27 Feb 2012 23:29:24 +0100
Subject: [PATCH] Issue 2328: Ledger lines in PNG output have white interior

Don't stroke rectangles with height or width 0 in draw_round_box
---
 ps/music-drawing-routines.ps | 21 +++++++++++++--------
 1 file changed, 13 insertions(+), 8 deletions(-)

diff --git a/ps/music-drawing-routines.ps b/ps/music-drawing-routines.ps
index d7450e452b..3e62f0366e 100644
--- a/ps/music-drawing-routines.ps
+++ b/ps/music-drawing-routines.ps
@@ -98,15 +98,20 @@ bind def
         dup
 	0.0 gt {
 		setlinewidth % w h x y
-		0 setlinecap
-		1 setlinejoin
-
 		rmoveto % w h
-		currentpoint % w h x1 y1
-		4 2 roll % x1 y1 w h
-		4 copy
-		rectfill
-		rectstroke
+		2 copy 0 ne exch 0 ne and
+		{
+		    0 setlinecap
+		    1 setlinejoin
+		    currentpoint % w h x1 y1
+		    4 2 roll % x1 y1 w h
+		    4 copy
+		    rectfill
+		    rectstroke
+		} {
+		    1 setlinecap
+		    rlineto stroke
+		} ifelse
 	} {
 		pop % w h x y
 		rmoveto % w h
-- 
2.39.2