From bc59428b3a363967d9097d1559a9a7601fd5a179 Mon Sep 17 00:00:00 2001
From: alex77git <alexander.kleinsorge@gmx.de>
Date: Mon, 20 May 2013 02:28:40 +0200
Subject: [PATCH] Bug #2966, insert CV_Assert(size.width>0 && size.height>0);
 in imshow()

---
 modules/highgui/src/window.cpp | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/modules/highgui/src/window.cpp b/modules/highgui/src/window.cpp
index 6d29534643..6801bd8a4b 100644
--- a/modules/highgui/src/window.cpp
+++ b/modules/highgui/src/window.cpp
@@ -256,12 +256,17 @@ namespace
 
 void cv::imshow( const string& winname, InputArray _img )
 {
+    const Size size = _img.size();
 #ifndef HAVE_OPENGL
-    Mat img = _img.getMat();
-    CvMat c_img = img;
-    cvShowImage(winname.c_str(), &c_img);
+    CV_Assert(size.width>0 && size.height>0);
+	{
+        Mat img = _img.getMat();
+        CvMat c_img = img;
+        cvShowImage(winname.c_str(), &c_img);
+	}
 #else
     const double useGl = getWindowProperty(winname, WND_PROP_OPENGL);
+    CV_Assert(size.width>0 && size.height>0);
 
     if (useGl <= 0)
     {
@@ -275,7 +280,6 @@ void cv::imshow( const string& winname, InputArray _img )
 
         if (autoSize > 0)
         {
-            Size size = _img.size();
             resizeWindow(winname, size.width, size.height);
         }