From 8fa42749743dc38f7465b0b729b447d62af04dc4 Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Thu, 12 May 2016 22:55:01 +0530
Subject: [PATCH] ...

---
 src/calibre/gui2/pictureflow/pictureflow.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/calibre/gui2/pictureflow/pictureflow.cpp b/src/calibre/gui2/pictureflow/pictureflow.cpp
index 903f90d616..2c2b5460e2 100644
--- a/src/calibre/gui2/pictureflow/pictureflow.cpp
+++ b/src/calibre/gui2/pictureflow/pictureflow.cpp
@@ -625,7 +625,7 @@ static QImage prepareSurface(QImage srcimg, int w, int h, bool doReflections, bo
         result.setText(OFFSET_KEY, QString::number(left));
         result.setText(WIDTH_KEY, QString::number(temp.width()));
         for (y = 0; y < temp.height(); y++) {
-            const uchar *src = temp.scanLine(y);
+            const uchar *src = temp.constScanLine(y);
             uchar *dest = img.scanLine(top + y) + (bpp * left);
             memcpy(dest, src, x);
         }