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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#include "qxcbwmsupport.h"
#include "qxcbscreen.h"
#include <qdebug.h>
QT_BEGIN_NAMESPACE
QXcbWMSupport::QXcbWMSupport(QXcbConnection *c)
: QXcbObject(c)
{
updateNetWMAtoms();
updateVirtualRoots();
}
bool QXcbWMSupport::isSupportedByWM(xcb_atom_t atom) const
{
return net_wm_atoms.contains(atom);
}
void QXcbWMSupport::updateNetWMAtoms()
{
net_wm_atoms.clear();
xcb_window_t root = connection()->primaryScreen()->root();
int offset = 0;
int remaining = 0;
do {
auto reply = Q_XCB_REPLY(xcb_get_property, xcb_connection(), false, root, atom(QXcbAtom::_NET_SUPPORTED), XCB_ATOM_ATOM, offset, 1024);
if (!reply)
break;
remaining = 0;
if (reply->type == XCB_ATOM_ATOM && reply->format == 32) {
int len = xcb_get_property_value_length(reply.get())/sizeof(xcb_atom_t);
xcb_atom_t *atoms = (xcb_atom_t *)xcb_get_property_value(reply.get());
int s = net_wm_atoms.size();
net_wm_atoms.resize(s + len);
memcpy(net_wm_atoms.data() + s, atoms, len*sizeof(xcb_atom_t));
remaining = reply->bytes_after;
offset += len;
}
} while (remaining > 0);
}
// update the virtual roots array
void QXcbWMSupport::updateVirtualRoots()
{
net_virtual_roots.clear();
if (!isSupportedByWM(atom(QXcbAtom::_NET_VIRTUAL_ROOTS)))
return;
xcb_window_t root = connection()->primaryScreen()->root();
int offset = 0;
int remaining = 0;
do {
auto reply = Q_XCB_REPLY(xcb_get_property, xcb_connection(),
false, root, atom(QXcbAtom::_NET_VIRTUAL_ROOTS), XCB_ATOM_WINDOW, offset, 1024);
if (!reply)
break;
remaining = 0;
if (reply->type == XCB_ATOM_WINDOW && reply->format == 32) {
int len = xcb_get_property_value_length(reply.get())/sizeof(xcb_window_t);
xcb_window_t *roots = (xcb_window_t *)xcb_get_property_value(reply.get());
int s = net_virtual_roots.size();
net_virtual_roots.resize(s + len);
memcpy(net_virtual_roots.data() + s, roots, len*sizeof(xcb_window_t));
remaining = reply->bytes_after;
offset += len;
}
} while (remaining > 0);
//#define VIRTUAL_ROOTS_DEBUG
#ifdef VIRTUAL_ROOTS_DEBUG
qDebug("======== updateVirtualRoots");
for (int i = 0; i < net_virtual_roots.size(); ++i)
qDebug() << connection()->atomName(net_virtual_roots.at(i));
qDebug("======== updateVirtualRoots");
#endif
}
QT_END_NAMESPACE
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