From b576ffb215c097a7219c30b245c9f7cb1e0ba321 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Du=C5=A1an=20Poizl?= <nou.spiro@gmail.com>
Date: Sat, 30 Jul 2016 14:28:12 +0200
Subject: [PATCH] Don't crash on empty list

---
 imageringlist.cpp | 30 ++++++++++++++++++------------
 1 file changed, 18 insertions(+), 12 deletions(-)

diff --git a/imageringlist.cpp b/imageringlist.cpp
index 41cf312..39e2baa 100644
--- a/imageringlist.cpp
+++ b/imageringlist.cpp
@@ -119,22 +119,28 @@ void ImageRingList::setFiles(const QStringList files)
 
 void ImageRingList::increment()
 {
-    (*m_firstImage)->release();
-    m_firstImage = increment(m_firstImage);
-    m_currImage = increment(m_currImage);
-    (*m_currImage)->load();
-    m_lastImage = increment(m_lastImage);
-    (*m_lastImage)->load();
+    if(m_images.size())
+    {
+        (*m_firstImage)->release();
+        m_firstImage = increment(m_firstImage);
+        m_currImage = increment(m_currImage);
+        (*m_currImage)->load();
+        m_lastImage = increment(m_lastImage);
+        (*m_lastImage)->load();
+    }
 }
 
 void ImageRingList::decrement()
 {
-    (*m_lastImage)->release();
-    m_firstImage = decrement(m_firstImage);
-    m_currImage = decrement(m_currImage);
-    (*m_currImage)->load();
-    m_lastImage = decrement(m_lastImage);
-    (*m_firstImage)->load();
+    if(m_images.size())
+    {
+        (*m_lastImage)->release();
+        m_firstImage = decrement(m_firstImage);
+        m_currImage = decrement(m_currImage);
+        (*m_currImage)->load();
+        m_lastImage = decrement(m_lastImage);
+        (*m_firstImage)->load();
+    }
 }
 
 QList<shared_ptr<Image>>::iterator ImageRingList::increment(QList<ImagePtr>::iterator iter)