diff options
Diffstat (limited to 'src/plugins/platforms/windows/qwindowsbackingstore.cpp')
| -rw-r--r-- | src/plugins/platforms/windows/qwindowsbackingstore.cpp | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/src/plugins/platforms/windows/qwindowsbackingstore.cpp b/src/plugins/platforms/windows/qwindowsbackingstore.cpp index dfbbe3069c..26205eb146 100644 --- a/src/plugins/platforms/windows/qwindowsbackingstore.cpp +++ b/src/plugins/platforms/windows/qwindowsbackingstore.cpp @@ -88,8 +88,10 @@ void QWindowsBackingStore::flush(QWindow *window, const QRegion ®ion, QWindowsWindow *rw = QWindowsWindow::baseWindowOf(window); #ifndef Q_OS_WINCE + const bool hasAlpha = rw->format().hasAlpha(); const Qt::WindowFlags flags = window->flags(); - if ((flags & Qt::FramelessWindowHint) && QWindowsWindow::setWindowLayered(rw->handle(), flags, rw->format().hasAlpha(), rw->opacity())) { + if ((flags & Qt::FramelessWindowHint) && QWindowsWindow::setWindowLayered(rw->handle(), flags, hasAlpha, rw->opacity()) && hasAlpha) { + // Windows with alpha: Use blend function to update. QRect r = window->frameGeometry(); QPoint frameOffset(window->frameMargins().left(), window->frameMargins().top()); QRect dirtyRect = br.translated(offset + frameOffset); |