From d67469f3f6c85bb11dad926047365b49280e0198 Mon Sep 17 00:00:00 2001
From: Ingo <heckflosse@i-weyrich.de>
Date: Fri, 8 Nov 2013 18:24:10 +0100
Subject: [PATCH] Shadows/Highlights - High radius causes vertical lines, Issue
 1921

---
 rtengine/gauss.h | 22 ++++++++++++----------
 1 file changed, 12 insertions(+), 10 deletions(-)

diff --git a/rtengine/gauss.h b/rtengine/gauss.h
index 7605b8789..0c16f2a5e 100644
--- a/rtengine/gauss.h
+++ b/rtengine/gauss.h
@@ -332,10 +332,12 @@ template<class T> void gaussHorizontalSse (T** src, T** dst, int W, int H, float
 
 template<class T> void gaussHorizontal (T** src, T** dst, AlignedBufferMP<double> &buffer, int W, int H, double sigma) {
 
-#ifdef __SSE__
-    gaussHorizontalSse<T> (src, dst, W, H, sigma);
-    return;
-#else
+#ifdef __SSE__
+	if(sigma < 70) { // bigger sigma only with double precision
+		gaussHorizontalSse<T> (src, dst, W, H, sigma);
+		return;
+	}
+#endif
     if (sigma<0.25) {
         // dont perform filtering
         if (src!=dst)
@@ -411,7 +413,6 @@ template<class T> void gaussHorizontal (T** src, T** dst, AlignedBufferMP<double
 
         buffer.release(pBuf);
     }
-#endif
 }
 
 #ifdef __SSE__
@@ -561,10 +562,12 @@ template<class T> void gaussVerticalSse (T** src, T** dst, int W, int H, float s
 
 template<class T> void gaussVertical (T** src, T** dst, AlignedBufferMP<double> &buffer, int W, int H, double sigma) {
 
-#ifdef __SSE__
-    gaussVerticalSse<T> (src, dst, W, H, sigma);
-    return;
-#else
+#ifdef __SSE__
+	if(sigma < 70) { // bigger sigma only with double precision
+		gaussVerticalSse<T> (src, dst, W, H, sigma);
+		return;
+	}
+#endif
 
     if (sigma<0.25) {
         // dont perform filtering
@@ -642,7 +645,6 @@ template<class T> void gaussVertical (T** src, T** dst, AlignedBufferMP<double>
 
         buffer.release(pBuf);
     }
-#endif
 }