diff options
Diffstat (limited to 'src/plugins/platforms/windows/qwindowsbackingstore.cpp')
| -rw-r--r-- | src/plugins/platforms/windows/qwindowsbackingstore.cpp | 18 |
1 files changed, 14 insertions, 4 deletions
diff --git a/src/plugins/platforms/windows/qwindowsbackingstore.cpp b/src/plugins/platforms/windows/qwindowsbackingstore.cpp index b7937b4d84..792eaf0fdc 100644 --- a/src/plugins/platforms/windows/qwindowsbackingstore.cpp +++ b/src/plugins/platforms/windows/qwindowsbackingstore.cpp @@ -1,6 +1,6 @@ /**************************************************************************** ** -** Copyright (C) 2012 Digia Plc and/or its subsidiary(-ies). +** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies). ** Contact: http://www.qt-project.org/legal ** ** This file is part of the plugins of the Qt Toolkit. @@ -45,6 +45,7 @@ #include "qwindowscontext.h" #include <QtGui/QWindow> +#include <QtGui/QPainter> #include <QtCore/QDebug> @@ -147,8 +148,10 @@ void QWindowsBackingStore::resize(const QSize &size, const QRegion ®ion) nsp << " from: " << m_image->image().size(); } #endif - m_image.reset(new QWindowsNativeImage(size.width(), size.height(), - QWindowsNativeImage::systemFormat())); + QImage::Format format = QWindowsNativeImage::systemFormat(); + if (format == QImage::Format_RGB32 && rasterWindow()->window()->format().hasAlpha()) + format = QImage::Format_ARGB32; + m_image.reset(new QWindowsNativeImage(size.width(), size.height(), format)); } } @@ -168,9 +171,16 @@ bool QWindowsBackingStore::scroll(const QRegion &area, int dx, int dy) void QWindowsBackingStore::beginPaint(const QRegion ®ion) { - Q_UNUSED(region); if (QWindowsContext::verboseBackingStore > 1) qDebug() << __FUNCTION__; + + if (m_image->image().hasAlphaChannel()) { + QPainter p(&m_image->image()); + p.setCompositionMode(QPainter::CompositionMode_Source); + const QColor blank = Qt::transparent; + foreach (const QRect &r, region.rects()) + p.fillRect(r, blank); + } } QWindowsWindow *QWindowsBackingStore::rasterWindow() const |