From a4927c1d13a6969f0994b9961c5e4db5cd4dfa57 Mon Sep 17 00:00:00 2001
From: Manolo Gouy <Manolo>
Date: Sun, 13 May 2018 07:42:44 +0000
Subject: [PATCH] Fl_Scalable_Graphics_Driver::rect(): don't draw a rectangle
 if w or h is negative

git-svn-id: file:///fltk/svn/fltk/branches/branch-1.4@12920 ea41ed52-d2ee-0310-a9c1-e6b18d33e121
---
 src/Fl_Graphics_Driver.cxx | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/src/Fl_Graphics_Driver.cxx b/src/Fl_Graphics_Driver.cxx
index ad0fd07cf..96c072d15 100644
--- a/src/Fl_Graphics_Driver.cxx
+++ b/src/Fl_Graphics_Driver.cxx
@@ -346,10 +346,12 @@ void Fl_Scalable_Graphics_Driver::rect(int x, int y, int w, int h)
   if (int(scale()) == scale()) {
     rect_unscaled(x * scale(), y * scale(), w * scale(), h * scale());
   } else {
-    xyline(x, y, x+w-1);
-    yxline(x, y, y+h-1);
-    yxline(x+w-1, y, y+h-1);
-    xyline(x, y+h-1, x+w-1);
+    if (w > 0 && h > 0) {
+      xyline(x, y, x+w-1);
+      yxline(x, y, y+h-1);
+      yxline(x+w-1, y, y+h-1);
+      xyline(x, y+h-1, x+w-1);
+    }
   }
 }