From d3350b50aa56da9f9448adf17c8015c2ff676187 Mon Sep 17 00:00:00 2001
From: Vadim Pisarevsky <no@email>
Date: Thu, 11 Aug 2011 13:12:59 +0000
Subject: [PATCH] avoid infinite loops when 0-area image is filtered (ticket
 #1295)

---
 modules/imgproc/src/filter.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/modules/imgproc/src/filter.cpp b/modules/imgproc/src/filter.cpp
index b51e4ca2c..6a90d3e4a 100644
--- a/modules/imgproc/src/filter.cpp
+++ b/modules/imgproc/src/filter.cpp
@@ -437,6 +437,9 @@ void FilterEngine::apply(const Mat& src, Mat& dst,
     Rect srcRoi = _srcRoi;
     if( srcRoi == Rect(0,0,-1,-1) )
         srcRoi = Rect(0,0,src.cols,src.rows);
+    
+    if( srcRoi.area() == 0 )
+        return;
 
     CV_Assert( dstOfs.x >= 0 && dstOfs.y >= 0 &&
         dstOfs.x + srcRoi.width <= dst.cols &&