1/****************************************************************************
2**
3** Copyright (C) 2016 The Qt Company Ltd.
4** Contact: https://www.qt.io/licensing/
5**
6** This file is part of the plugins of the Qt Toolkit.
7**
8** $QT_BEGIN_LICENSE:LGPL$
9** Commercial License Usage
10** Licensees holding valid commercial Qt licenses may use this file in
11** accordance with the commercial license agreement provided with the
12** Software or, alternatively, in accordance with the terms contained in
13** a written agreement between you and The Qt Company. For licensing terms
14** and conditions see https://www.qt.io/terms-conditions. For further
15** information use the contact form at https://www.qt.io/contact-us.
16**
17** GNU Lesser General Public License Usage
18** Alternatively, this file may be used under the terms of the GNU Lesser
19** General Public License version 3 as published by the Free Software
20** Foundation and appearing in the file LICENSE.LGPL3 included in the
21** packaging of this file. Please review the following information to
22** ensure the GNU Lesser General Public License version 3 requirements
23** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
24**
25** GNU General Public License Usage
26** Alternatively, this file may be used under the terms of the GNU
27** General Public License version 2.0 or (at your option) the GNU General
28** Public license version 3 or any later version approved by the KDE Free
29** Qt Foundation. The licenses are as published by the Free Software
30** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
31** included in the packaging of this file. Please review the following
32** information to ensure the GNU General Public License requirements will
33** be met: https://www.gnu.org/licenses/gpl-2.0.html and
34** https://www.gnu.org/licenses/gpl-3.0.html.
35**
36** $QT_END_LICENSE$
37**
38****************************************************************************/
39
40#include "qxcbwmsupport.h"
41#include "qxcbscreen.h"
42
43#include <qdebug.h>
44
45QT_BEGIN_NAMESPACE
46
47QXcbWMSupport::QXcbWMSupport(QXcbConnection *c)
48 : QXcbObject(c)
49{
50 updateNetWMAtoms();
51 updateVirtualRoots();
52}
53
54bool QXcbWMSupport::isSupportedByWM(xcb_atom_t atom) const
55{
56 return net_wm_atoms.contains(t: atom);
57}
58
59
60
61void QXcbWMSupport::updateNetWMAtoms()
62{
63 net_wm_atoms.clear();
64
65 xcb_window_t root = connection()->primaryScreen()->root();
66 int offset = 0;
67 int remaining = 0;
68 do {
69 auto reply = Q_XCB_REPLY(xcb_get_property, xcb_connection(), false, root, atom(QXcbAtom::_NET_SUPPORTED), XCB_ATOM_ATOM, offset, 1024);
70 if (!reply)
71 break;
72
73 remaining = 0;
74
75 if (reply->type == XCB_ATOM_ATOM && reply->format == 32) {
76 int len = xcb_get_property_value_length(R: reply.get())/sizeof(xcb_atom_t);
77 xcb_atom_t *atoms = (xcb_atom_t *)xcb_get_property_value(R: reply.get());
78 int s = net_wm_atoms.size();
79 net_wm_atoms.resize(asize: s + len);
80 memcpy(dest: net_wm_atoms.data() + s, src: atoms, n: len*sizeof(xcb_atom_t));
81
82 remaining = reply->bytes_after;
83 offset += len;
84 }
85 } while (remaining > 0);
86}
87
88// update the virtual roots array
89void QXcbWMSupport::updateVirtualRoots()
90{
91 net_virtual_roots.clear();
92
93 if (!isSupportedByWM(atom: atom(atom: QXcbAtom::_NET_VIRTUAL_ROOTS)))
94 return;
95
96 xcb_window_t root = connection()->primaryScreen()->root();
97 int offset = 0;
98 int remaining = 0;
99 do {
100 auto reply = Q_XCB_REPLY(xcb_get_property, xcb_connection(),
101 false, root, atom(QXcbAtom::_NET_VIRTUAL_ROOTS), XCB_ATOM_WINDOW, offset, 1024);
102 if (!reply)
103 break;
104
105 remaining = 0;
106
107 if (reply->type == XCB_ATOM_WINDOW && reply->format == 32) {
108 int len = xcb_get_property_value_length(R: reply.get())/sizeof(xcb_window_t);
109 xcb_window_t *roots = (xcb_window_t *)xcb_get_property_value(R: reply.get());
110 int s = net_virtual_roots.size();
111 net_virtual_roots.resize(asize: s + len);
112 memcpy(dest: net_virtual_roots.data() + s, src: roots, n: len*sizeof(xcb_window_t));
113
114 remaining = reply->bytes_after;
115 offset += len;
116 }
117
118 } while (remaining > 0);
119
120//#define VIRTUAL_ROOTS_DEBUG
121#ifdef VIRTUAL_ROOTS_DEBUG
122 qDebug("======== updateVirtualRoots");
123 for (int i = 0; i < net_virtual_roots.size(); ++i)
124 qDebug() << connection()->atomName(net_virtual_roots.at(i));
125 qDebug("======== updateVirtualRoots");
126#endif
127}
128
129QT_END_NAMESPACE
130

source code of qtbase/src/plugins/platforms/xcb/qxcbwmsupport.cpp