From 6acf123c6a00f900bd16ffc30612eec9e126b826 Mon Sep 17 00:00:00 2001
From: Eike Ziller <eike.ziller@nokia.com>
Date: Fri, 9 Dec 2011 07:39:20 +0100
Subject: [PATCH] Restrict image viewer scaling to something reasonable.

Task-number: QTCREATORBUG-4383

Change-Id: Iba7925b6ae62346b25e2eaa9c3da26b2a7cf08ec
Reviewed-by: Denis Mingulov <denis@mingulov.com>
Reviewed-by: Leandro Melo <leandro.melo@nokia.com>
---
 src/plugins/imageviewer/imageview.cpp | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/src/plugins/imageviewer/imageview.cpp b/src/plugins/imageviewer/imageview.cpp
index 8001780f5a9..6aba7989fb6 100644
--- a/src/plugins/imageviewer/imageview.cpp
+++ b/src/plugins/imageviewer/imageview.cpp
@@ -190,7 +190,16 @@ void ImageView::setViewOutline(bool enable)
 
 void ImageView::doScale(qreal factor)
 {
-    scale(factor, factor);
+    qreal currentScale = transform().m11();
+    qreal newScale = currentScale * factor;
+    qreal actualFactor = factor;
+    // cap to 0.001 - 1000
+    if (newScale > 1000)
+        actualFactor = 1000./currentScale;
+    else if (newScale < 0.001)
+        actualFactor = 0.001/currentScale;
+
+    scale(actualFactor, actualFactor);
     emitScaleFactor();
 }