Prevent crash in OpenGL engine when scaling images / pixmaps.

Make sure the resulting image / pixmap is valid if the source was valid.

Task-number: QTBUG-19157
Reviewed-by: Kim
Reviewed-by: Benjamin Poulain
(cherry picked from commit 1c5da7207a21cc44a4a08d291c290ffcd9b958fd)

2 files changed, 4 insertions, 0 deletions

diff --git a/src/gui/image/qimage.cpp b/src/gui/image/qimage.cpp
index 50b372ea63..25f6295b71 100644
--- a/src/gui/image/qimage.cpp
+++ b/src/gui/image/qimage.cpp
@@ -4449,6 +4449,8 @@ QImage QImage::scaled(const QSize& s, Qt::AspectRatioMode aspectMode, Qt::Transf
 
     QSize newSize = size();
     newSize.scale(s, aspectMode);
+    newSize.rwidth() = qMax(newSize.width(), 1);
+    newSize.rheight() = qMax(newSize.height(), 1);
     if (newSize == size())
         return *this;
 
diff --git a/src/gui/image/qpixmap.cpp b/src/gui/image/qpixmap.cpp
index c34f6ac1b2..640864d7dc 100644
--- a/src/gui/image/qpixmap.cpp
+++ b/src/gui/image/qpixmap.cpp
@@ -1514,6 +1514,8 @@ QPixmap QPixmap::scaled(const QSize& s, Qt::AspectRatioMode aspectMode, Qt::Tran
 
     QSize newSize = size();
     newSize.scale(s, aspectMode);
+    newSize.rwidth() = qMax(newSize.width(), 1);
+    newSize.rheight() = qMax(newSize.height(), 1);
     if (newSize == size())
         return *this;