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Windows QPA: Set SWP_NOCOPYBITS during resize to avoid jitter 

Allowing Windows to re-use parts of the client area when resizing
might result in jitter. See discussion in:

https://stackoverflow.com/questions/53000291/how-to-smooth-ugly-jitter-flicker-jumping-when-resizing-windows-especially-drag

Fixes: QTBUG-97774
Pick-to: 6.2
Change-Id: Idc8f0d1953dd0a8b329312d8a9fd0509cc24d81f
Reviewed-by: Oliver Wolff <oliver.wolff@qt.io>
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@qt.io>
bb10
Yuhang Zhao 2021-10-24 12:59:02 +08:00
parent 1d983f2902
commit 000f1ee360
1 changed files with 6 additions and 1 deletions
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7
src/plugins/platforms/windows/qwindowswindow.cpp
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@ -2481,6 +2481,11 @@ void QWindowsWindow::propagateSizeHints()
bool QWindowsWindow::handleGeometryChangingMessage(MSG *message, const QWindow *qWindow, const QMargins &margins)
{
auto *windowPos = reinterpret_cast<WINDOWPOS *>(message->lParam);
// Tell Windows to discard the entire contents of the client area, as re-using
// parts of the client area would lead to jitter during resize.
windowPos->flags |= SWP_NOCOPYBITS;
if ((windowPos->flags & SWP_NOZORDER) == 0) {
if (QWindowsWindow *platformWindow = QWindowsWindow::windowsWindowOf(qWindow)) {
QWindow *parentWindow = qWindow->parent();
@ -2493,7 +2498,7 @@ bool QWindowsWindow::handleGeometryChangingMessage(MSG *message, const QWindow *
}
if (!qWindow->isTopLevel()) // Implement hasHeightForWidth().
return false;
if ((windowPos->flags & (SWP_NOCOPYBITS | SWP_NOSIZE)))
if (windowPos->flags & SWP_NOSIZE)
return false;
const QRect suggestedFrameGeometry(windowPos->x, windowPos->y,
windowPos->cx, windowPos->cy);