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Windows: Fix window opacity for non-translucent windows.

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Use the UpdateLayeredWindow() functions only for windows with alpha.

Task-number: QTBUG-33025

Change-Id: I64b0c28ee0997cd3d09dc76babe105ed474c6835
Reviewed-by: Joerg Bornemann <joerg.bornemann@digia.com>
This commit is contained in:
Friedemann Kleint 2013-09-10 12:03:07 +02:00 committed by The Qt Project
parent fad6aa619b
commit b7b573ad6d
2 changed files with 5 additions and 2 deletions
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4
src/plugins/platforms/windows/qwindowsbackingstore.cpp
View File

@ -88,8 +88,10 @@ void QWindowsBackingStore::flush(QWindow *window, const QRegion &region,
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);

3
src/plugins/platforms/windows/qwindowswindow.cpp
View File

@ -250,7 +250,8 @@ static void setWindowOpacity(HWND hwnd, Qt::WindowFlags flags, bool hasAlpha, qr
Q_UNUSED(level);
#else
if (QWindowsWindow::setWindowLayered(hwnd, flags, hasAlpha, level)) {
if (flags & Qt::FramelessWindowHint) {
if (hasAlpha && (flags & Qt::FramelessWindowHint)) {
// Windows with alpha: Use blend function to update.
BLENDFUNCTION blend = {AC_SRC_OVER, 0, (BYTE)(255.0 * level), AC_SRC_ALPHA};
QWindowsContext::user32dll.updateLayeredWindow(hwnd, NULL, NULL, NULL, NULL, NULL, 0, &blend, ULW_ALPHA);
} else {