kwin/screens_xrandr.cpp

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/********************************************************************
KWin - the KDE window manager
This file is part of the KDE project.
Copyright (C) 2014 Martin Gräßlin <mgraesslin@kde.org>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*********************************************************************/
#include "screens_xrandr.h"
#include "xcbutils.h"
namespace KWin
{
XRandRScreens::XRandRScreens(QObject *parent)
: Screens(parent)
, X11EventFilter(Xcb::Extensions::self()->randrNotifyEvent())
{
}
XRandRScreens::~XRandRScreens() = default;
template <typename T>
void XRandRScreens::update()
{
auto fallback = [this]() {
m_geometries << QRect();
setCount(1);
};
m_geometries.clear();
T resources(rootWindow());
if (resources.isNull()) {
fallback();
return;
}
xcb_randr_crtc_t *crtcs = resources.crtcs();
QVector<Xcb::RandR::CrtcInfo> infos(resources->num_crtcs);
for (int i = 0; i < resources->num_crtcs; ++i) {
infos[i] = Xcb::RandR::CrtcInfo(crtcs[i], resources->config_timestamp);
}
for (int i = 0; i < resources->num_crtcs; ++i) {
Xcb::RandR::CrtcInfo info(infos.at(i));
const QRect geo = info.rect();
if (geo.isValid()) {
m_geometries << geo;
}
}
if (m_geometries.isEmpty()) {
fallback();
return;
}
setCount(m_geometries.count());
}
void XRandRScreens::init()
{
KWin::Screens::init();
// we need to call ScreenResources at least once to be able to use current
update<Xcb::RandR::ScreenResources>();
emit changed();
}
QRect XRandRScreens::geometry(int screen) const
{
if (screen >= m_geometries.size() || screen < 0) {
return QRect();
}
return m_geometries.at(screen);
}
int XRandRScreens::number(const QPoint &pos) const
{
int bestScreen = 0;
int minDistance = INT_MAX;
for (int i = 0; i < m_geometries.size(); ++i) {
const QRect &geo = m_geometries.at(i);
if (geo.contains(pos)) {
return i;
}
int distance = QPoint(geo.topLeft() - pos).manhattanLength();
distance = qMin(distance, QPoint(geo.topRight() - pos).manhattanLength());
distance = qMin(distance, QPoint(geo.bottomRight() - pos).manhattanLength());
distance = qMin(distance, QPoint(geo.bottomLeft() - pos).manhattanLength());
if (distance < minDistance) {
minDistance = distance;
bestScreen = i;
}
}
return bestScreen;
}
QSize XRandRScreens::size(int screen) const
{
const QRect geo = geometry(screen);
if (!geo.isValid()) {
return QSize();
}
return geo.size();
}
void XRandRScreens::updateCount()
{
update<Xcb::RandR::CurrentResources>();
}
bool XRandRScreens::event(xcb_generic_event_t *event)
{
Q_ASSERT((event->response_type & ~0x80) == Xcb::Extensions::self()->randrNotifyEvent());
// let's try to gather a few XRandR events, unlikely that there is just one
startChangedTimer();
return false;
}
} // namespace