Merge remote-tracking branch 'origin/5.6' into 5.7

Change-Id: I1a63523de158757964b6fb5ea026cf69a6c5ddcf

1 files changed, 15 insertions, 1 deletions

diff --git a/src/plugins/platforms/cocoa/qcocoadrag.mm b/src/plugins/platforms/cocoa/qcocoadrag.mm
index 872b97566f..bb8d12e3ce 100644
--- a/src/plugins/platforms/cocoa/qcocoadrag.mm
+++ b/src/plugins/platforms/cocoa/qcocoadrag.mm
@@ -40,6 +40,9 @@
 #include "qcocoadrag.h"
 #include "qmacclipboard.h"
 #include "qcocoahelpers.h"
+#ifndef QT_NO_WIDGETS
+#include <QtWidgets/qwidget.h>
+#endif
 
 QT_BEGIN_NAMESPACE
 
@@ -187,7 +190,18 @@ QPixmap QCocoaDrag::dragPixmap(QDrag *drag, QPoint &hotSpot) const
                 const int width = fm.width(s);
                 const int height = fm.height();
                 if (width > 0 && height > 0) {
-                    pm = QPixmap(width, height);
+                    qreal dpr = 1.0;
+                    if (const QWindow *sourceWindow = qobject_cast<QWindow *>(drag->source())) {
+                        dpr = sourceWindow->devicePixelRatio();
+                    }
+#ifndef QT_NO_WIDGETS
+                    else if (const QWidget *sourceWidget = qobject_cast<QWidget *>(drag->source())) {
+                        if (const QWindow *sourceWindow = sourceWidget->window()->windowHandle())
+                            dpr = sourceWindow->devicePixelRatio();
+                    }
+#endif
+                    pm = QPixmap(width * dpr, height * dpr);
+                    pm.setDevicePixelRatio(dpr);
                     QPainter p(&pm);
                     p.fillRect(0, 0, pm.width(), pm.height(), Qt::color0);
                     p.setPen(Qt::color1);