From fdcdae21d8ec077d8c24786ed5d4420fe770bcbf Mon Sep 17 00:00:00 2001
From: Gatis Paeglis <gatis.paeglis@nokia.com>
Date: Tue, 26 Jun 2012 19:14:45 +0200
Subject: Set window's surface format to support alpha channel.

Task-number: QTBUG-26114
Change-Id: I33f191373327832fb9d3054366412ec5be855cff
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@nokia.com>
---
 src/platformsupport/dnd/qshapedpixmapdndwindow.cpp | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'src/platformsupport/dnd')

diff --git a/src/platformsupport/dnd/qshapedpixmapdndwindow.cpp b/src/platformsupport/dnd/qshapedpixmapdndwindow.cpp
index 4eed1e7d85..95ceb0dbbc 100644
--- a/src/platformsupport/dnd/qshapedpixmapdndwindow.cpp
+++ b/src/platformsupport/dnd/qshapedpixmapdndwindow.cpp
@@ -50,6 +50,9 @@ QShapedPixmapWindow::QShapedPixmapWindow()
     : QWindow(),
       m_backingStore(0)
 {
+    QSurfaceFormat format;
+    format.setAlphaBufferSize(8);
+    setFormat(format);
     setSurfaceType(RasterSurface);
     setWindowFlags(Qt::ToolTip | Qt::FramelessWindowHint |
                    Qt::X11BypassWindowManagerHint | Qt::WindowTransparentForInput);
@@ -67,6 +70,7 @@ void QShapedPixmapWindow::render()
 
     {
         QPainter p(device);
+        p.setCompositionMode(QPainter::CompositionMode_Source);
         p.drawPixmap(0, 0, m_pixmap);
     }
 
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