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kwin/xwaylandclient.cpp

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[x11] Disable synchronized resizing for Xwayland < 1.21 In case Xwayland does not use multiple buffers, the currently attached buffer is going to be destroyed if the frame window is resized. It may render the previous and the current window pixmap invalid and thus result in visual artifacts when an X11 client is being interactively resized. In order to avoid the visual artifacts, this change disables support for synchronized resizing for X11 clients if the version of Xwayland is less than the version in which Xwayland started using multiple buffers, i.e. 1.21. Differential Revision: https://phabricator.kde.org/D29250
2020-04-27 18:44:12 +00:00
/********************************************************************
KWin - the KDE window manager
This file is part of the KDE project.
Switch to SPDX license markers The main advantage of SPDX license identifiers over the traditional license headers is that it's more difficult to overlook inappropriate licenses for kwin, for example GPL 3. We also don't have to copy a lot of boilerplate text. In order to create this change, I ran licensedigger -r -c from the toplevel source directory.
2020-08-02 22:10:35 +00:00
SPDX-FileCopyrightText: 2020 Vlad Zahorodnii <vlad.zahorodnii@kde.org>
[x11] Disable synchronized resizing for Xwayland < 1.21 In case Xwayland does not use multiple buffers, the currently attached buffer is going to be destroyed if the frame window is resized. It may render the previous and the current window pixmap invalid and thus result in visual artifacts when an X11 client is being interactively resized. In order to avoid the visual artifacts, this change disables support for synchronized resizing for X11 clients if the version of Xwayland is less than the version in which Xwayland started using multiple buffers, i.e. 1.21. Differential Revision: https://phabricator.kde.org/D29250
2020-04-27 18:44:12 +00:00
Switch to SPDX license markers The main advantage of SPDX license identifiers over the traditional license headers is that it's more difficult to overlook inappropriate licenses for kwin, for example GPL 3. We also don't have to copy a lot of boilerplate text. In order to create this change, I ran licensedigger -r -c from the toplevel source directory.
2020-08-02 22:10:35 +00:00
SPDX-License-Identifier: GPL-2.0-or-later
[x11] Disable synchronized resizing for Xwayland < 1.21 In case Xwayland does not use multiple buffers, the currently attached buffer is going to be destroyed if the frame window is resized. It may render the previous and the current window pixmap invalid and thus result in visual artifacts when an X11 client is being interactively resized. In order to avoid the visual artifacts, this change disables support for synchronized resizing for X11 clients if the version of Xwayland is less than the version in which Xwayland started using multiple buffers, i.e. 1.21. Differential Revision: https://phabricator.kde.org/D29250
2020-04-27 18:44:12 +00:00
*********************************************************************/
#include "xwaylandclient.h"
namespace KWin
{
bool XwaylandClient::wantsSyncCounter() const
{
// When the frame window is resized, the attached buffer will be destroyed by
// Xwayland, causing unexpected invalid previous and current window pixmaps.
// With the addition of multiple window buffers in Xwayland 1.21, X11 clients
// are no longer able to destroy the buffer after it's been committed and not
// released by the compositor yet.
static const quint32 xwaylandVersion = xcb_get_setup(connection())->release_number;
return xwaylandVersion >= 12100000;
}
} // namespace KWin
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