1berry/qtbase
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Windows: Only use UpdateLayeredWindowIndirect if window has an alpha

Browse Source 
We only call UpdateLayeredWindow in setWindowOpacity if the window
has an alpha an no native frame, which means we need to use the
same condition in the backingstore when choosing how to flush the
window.

Amends 9a45fea9d1f6e445fb488693b107cdec6e42cccd.

As a follow-up we should refactor this code to avoid the duplicated
logic that must always be kept in sync.

Pick-to: 6.8
Change-Id: I2bd79bdc4a726339fc486d0892ff4e1960a5a10e
Reviewed-by: Zhao Yuhang <2546789017@qq.com>
Reviewed-by: Nodir Temirkhodjaev <nodir.temir@gmail.com>
Reviewed-by: Oliver Wolff <oliver.wolff@qt.io>
(cherry picked from commit 26f92a333e3caf575e79058e42d0b091e7f10fe1)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>
This commit is contained in:
Tor Arne Vestbø 2025-05-22 14:07:23 +02:00 committed by Qt Cherry-pick Bot
parent 1870660268
commit 6391b0b956
1 changed files with 4 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
src/plugins/platforms/windows/qwindowsbackingstore.cpp
View File

@ -50,7 +50,10 @@ void QWindowsBackingStore::flush(QWindow *window, const QRegion &region,
QWindowsWindow *rw = QWindowsWindow::windowsWindowOf(window);
Q_ASSERT(rw);
if (rw->isLayered()) {
const bool hasAlpha = rw->format().hasAlpha();
const Qt::WindowFlags flags = window->flags();
// Note: This condition must be in sync with setWindowOpacity. FIXME: Improve this :)
if (rw->isLayered() && hasAlpha && QWindowsWindow::hasNoNativeFrame(rw->handle(), flags)) {
// Windows with alpha: Use blend function to update.
QRect r = QHighDpi::toNativePixels(window->frameGeometry(), window);
QMargins frameMargins = rw->frameMargins();