3 files changed, 11 insertions, 4 deletions
diff --git a/src/gui/image/qimagereader.cpp b/src/gui/image/qimagereader.cpp
index 9320cfc..27f9627 100644
--- a/src/gui/image/qimagereader.cpp
+++ b/src/gui/image/qimagereader.cpp
@@ -503,7 +503,7 @@ QImageReaderPrivate::~QImageReaderPrivate()
 bool QImageReaderPrivate::initHandler()
 {
     // check some preconditions
-    if (!device || (!deleteDevice && !device->isOpen())) {
+    if (!device || (!deleteDevice && !device->isOpen() && !device->open(QIODevice::ReadOnly))) {
         imageReaderError = QImageReader::DeviceError;
         errorString = QLatin1String(QT_TRANSLATE_NOOP(QImageReader, "Invalid device"));
         return false;
diff --git a/src/gui/itemviews/qabstractitemview.cpp b/src/gui/itemviews/qabstractitemview.cpp
index dd9a7e6..0f99949 100644
--- a/src/gui/itemviews/qabstractitemview.cpp
+++ b/src/gui/itemviews/qabstractitemview.cpp
@@ -2090,7 +2090,7 @@ void QAbstractItemView::focusInEvent(QFocusEvent *event)
         bool autoScroll = d->autoScroll;
         d->autoScroll = false;
         QModelIndex index = moveCursor(MoveNext, Qt::NoModifier); // first visible index
-        if (index.isValid() && d->isIndexEnabled(index))
+        if (index.isValid() && d->isIndexEnabled(index) && event->reason() != Qt::MouseFocusReason)
             selectionModel()->setCurrentIndex(index, QItemSelectionModel::NoUpdate);
         d->autoScroll = autoScroll;
     }
diff --git a/src/opengl/qgl.cpp b/src/opengl/qgl.cpp
index 5908f14..7aba25a 100644
--- a/src/opengl/qgl.cpp
+++ b/src/opengl/qgl.cpp
@@ -2453,8 +2453,15 @@ QGLTexture *QGLContextPrivate::bindTexture(const QPixmap &pixmap, GLenum target,
     }
 #endif
 
-    if (!texture)
-        texture = bindTexture(pixmap.toImage(), target, format, key, options);
+    if (!texture) {
+        QImage image = pixmap.toImage();
+        // If the system depth is 16 and the pixmap doesn't have an alpha channel
+        // then we convert it to RGB16 in the hope that it gets uploaded as a 16
+        // bit texture which is much faster to access than a 32-bit one.
+        if (pixmap.depth() == 16 && !image.hasAlphaChannel() )
+            image = image.convertToFormat(QImage::Format_RGB16);
+        texture = bindTexture(image, target, format, key, options);
+    }
     // NOTE: bindTexture(const QImage&, GLenum, GLint, const qint64, bool) should never return null
     Q_ASSERT(texture);