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Windows: Fix frame margins calculation

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Passing nullptr to QHighDpi::toNativePixels() is seldom
correct, and will work only on the main screen.

Instead, call frameMargins() on the platform window
(instead of on the QWindow) and get the margins directly
in native pixels.

Pick-to: 5.15
Fixes: QTBUG-90716
Change-Id: Id7b31ec3246010c367781b64ed832c589bbaeb0d
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@qt.io>
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@qt.io>
This commit is contained in:
Morten Johan Sørvig 2021-01-29 15:41:23 +01:00
parent 7d1cda9de3
commit dafe9e2363
1 changed files with 2 additions and 3 deletions
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5
src/plugins/platforms/windows/qwindowsbackingstore.cpp
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@ -91,9 +91,8 @@ void QWindowsBackingStore::flush(QWindow *window, const QRegion &region,
if ((flags & Qt::FramelessWindowHint) && QWindowsWindow::setWindowLayered(rw->handle(), flags, hasAlpha, rw->opacity()) && hasAlpha) {
// Windows with alpha: Use blend function to update.
QRect r = QHighDpi::toNativePixels(window->frameGeometry(), window);
QPoint frameOffset(QHighDpi::toNativePixels(QPoint(window->frameMargins().left(), window->frameMargins().top()),
static_cast<const QWindow *>(nullptr)));
QRect dirtyRect = br.translated(offset + frameOffset);
QMargins frameMargins = rw->frameMargins();
QRect dirtyRect = br.translated(offset + QPoint(frameMargins.left(), frameMargins.top()));
SIZE size = {r.width(), r.height()};
POINT ptDst = {r.x(), r.y()};