kwin/screens.cpp

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/********************************************************************
KWin - the KDE window manager
This file is part of the KDE project.
Copyright (C) 2013 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.h"
#include "client.h"
#include "cursor.h"
#include "settings.h"
#include "workspace.h"
#if HAVE_WAYLAND
#include "wayland_backend.h"
#include <xcb/randr.h>
#endif
#include <QApplication>
#include <QDesktopWidget>
#include <QTimer>
namespace KWin
{
Screens *Screens::s_self = nullptr;
Screens *Screens::create(QObject *parent)
{
Q_ASSERT(!s_self);
#if HAVE_WAYLAND
if (kwinApp()->operationMode() == Application::OperationModeWaylandAndX11) {
s_self = new WaylandScreens(parent);
return s_self;
}
#endif
if (kwinApp()->operationMode() == Application::OperationModeX11) {
s_self = new DesktopWidgetScreens(parent);
}
s_self->init();
return s_self;
}
Screens::Screens(QObject *parent)
: QObject(parent)
, m_count(0)
, m_current(0)
, m_currentFollowsMouse(false)
, m_changedTimer(new QTimer(this))
{
}
Screens::~Screens()
{
s_self = NULL;
}
void Screens::init()
{
m_changedTimer->setSingleShot(true);
m_changedTimer->setInterval(100);
connect(m_changedTimer, SIGNAL(timeout()), SLOT(updateCount()));
connect(m_changedTimer, SIGNAL(timeout()), SIGNAL(changed()));
connect(this, &Screens::countChanged, this, &Screens::changed);
connect(this, &Screens::changed, this, &Screens::updateSize);
connect(this, &Screens::sizeChanged, this, &Screens::geometryChanged);
Settings settings;
settings.setDefaults();
m_currentFollowsMouse = settings.activeMouseScreen();
}
void Screens::reconfigure()
{
if (!m_config) {
return;
}
Settings settings(m_config);
settings.readConfig();
setCurrentFollowsMouse(settings.activeMouseScreen());
}
void Screens::updateSize()
{
QRect bounding;
for (int i = 0; i < count(); ++i) {
bounding = bounding.united(geometry(i));
}
if (m_boundingSize != bounding.size()) {
m_boundingSize = bounding.size();
emit sizeChanged();
}
}
void Screens::setCount(int count)
{
if (m_count == count) {
return;
}
const int previous = m_count;
m_count = count;
emit countChanged(previous, count);
}
void Screens::setCurrent(int current)
{
if (m_current == current) {
return;
}
m_current = current;
emit currentChanged();
}
void Screens::setCurrent(const QPoint &pos)
{
setCurrent(number(pos));
}
void Screens::setCurrent(const Client *c)
{
if (!c->isActive()) {
return;
}
if (!c->isOnScreen(m_current)) {
setCurrent(c->screen());
}
}
void Screens::setCurrentFollowsMouse(bool follows)
{
if (m_currentFollowsMouse == follows) {
return;
}
m_currentFollowsMouse = follows;
}
int Screens::current() const
{
if (m_currentFollowsMouse) {
return number(Cursor::pos());
}
Client *client = Workspace::self()->activeClient();
if (client && !client->isOnScreen(m_current)) {
return client->screen();
}
return m_current;
}
int Screens::intersecting(const QRect &r) const
{
int cnt = 0;
for (int i = 0; i < count(); ++i) {
if (geometry(i).intersects(r)) {
++cnt;
}
}
return cnt;
}
DesktopWidgetScreens::DesktopWidgetScreens(QObject *parent)
: Screens(parent)
, m_desktop(QApplication::desktop())
{
}
DesktopWidgetScreens::~DesktopWidgetScreens()
{
}
void DesktopWidgetScreens::init()
{
Screens::init();
connect(m_desktop, SIGNAL(screenCountChanged(int)), SLOT(startChangedTimer()));
connect(m_desktop, SIGNAL(resized(int)), SLOT(startChangedTimer()));
updateCount();
}
QRect DesktopWidgetScreens::geometry(int screen) const
{
if (Screens::self()->isChanging())
const_cast<DesktopWidgetScreens*>(this)->updateCount();
return m_desktop->screenGeometry(screen);
}
QSize DesktopWidgetScreens::size(int screen) const
{
return geometry(screen).size();
}
int DesktopWidgetScreens::number(const QPoint &pos) const
{
if (Screens::self()->isChanging())
const_cast<DesktopWidgetScreens*>(this)->updateCount();
return m_desktop->screenNumber(pos);
}
void DesktopWidgetScreens::updateCount()
{
setCount(m_desktop->screenCount());
}
#if HAVE_WAYLAND
WaylandScreens::WaylandScreens(QObject* parent)
: Screens(parent)
{
}
WaylandScreens::~WaylandScreens()
{
}
void WaylandScreens::init()
{
Screens::init();
connect(Wayland::WaylandBackend::self(), &Wayland::WaylandBackend::outputsChanged,
this, &WaylandScreens::startChangedTimer);
updateCount();
}
QRect WaylandScreens::geometry(int screen) const
{
if (screen >= m_geometries.size()) {
return QRect();
}
return m_geometries.at(screen);
}
QSize WaylandScreens::size(int screen) const
{
return geometry(screen).size();
}
int WaylandScreens::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;
}
void WaylandScreens::updateCount()
{
m_geometries.clear();
int count = 0;
const QList<Wayland::Output*> &outputs = Wayland::WaylandBackend::self()->outputs();
for (auto it = outputs.begin(); it != outputs.end(); ++it) {
if ((*it)->pixelSize().isEmpty()) {
continue;
}
count++;
m_geometries.append(QRect((*it)->globalPosition(), (*it)->pixelSize()));
}
if (m_geometries.isEmpty()) {
// we need a fake screen
m_geometries.append(QRect(0, 0, displayWidth(), displayHeight()));
setCount(1);
return;
}
updateXRandr();
emit changed();
}
namespace RandR
{
typedef Xcb::Wrapper<xcb_randr_get_screen_resources_current_reply_t,
xcb_randr_get_screen_resources_current_cookie_t,
&xcb_randr_get_screen_resources_current_reply,
&xcb_randr_get_screen_resources_current_unchecked> CurrentResources;
}
static bool setNewScreenSize(const QSize &size)
{
auto c = xcb_randr_set_screen_size_checked(connection(), rootWindow(), size.width(), size.height(), 1, 1);
ScopedCPointer<xcb_generic_error_t> error(xcb_request_check(connection(), c));
if (!error.isNull()) {
qDebug() << "Error setting screen size: " << error->error_code;
return false;
}
return true;
}
static xcb_randr_crtc_t getCrtc(const xcb_randr_get_screen_resources_current_reply_t* r)
{
if (xcb_randr_get_screen_resources_current_crtcs_length(r) == 0) {
qDebug() << "No CRTCs";
return XCB_NONE;
}
return xcb_randr_get_screen_resources_current_crtcs(r)[0];
}
static xcb_randr_output_t getOutputForCrtc(xcb_randr_crtc_t crtc)
{
ScopedCPointer<xcb_randr_get_crtc_info_reply_t> info(xcb_randr_get_crtc_info_reply(
connection(), xcb_randr_get_crtc_info(connection(), crtc, XCB_TIME_CURRENT_TIME), nullptr));
if (info->num_outputs == 0) {
return XCB_NONE;
}
return xcb_randr_get_crtc_info_outputs(info.data())[0];
}
static xcb_randr_mode_t createNewMode(const QSize &size)
{
// need to create the new mode
qDebug() << "Creating a new mode";
QString name(QString::number(size.width()));
name.append('x');
name.append(QString::number(size.height()));
xcb_randr_mode_info_t newInfo;
newInfo.dot_clock = 0;
newInfo.height = size.height();
newInfo.hskew = 0;
newInfo.hsync_end = 0;
newInfo.hsync_start = 0;
newInfo.htotal = size.width();
newInfo.id = 0;
newInfo.mode_flags = 0;
newInfo.vsync_end = 0;
newInfo.vsync_start = 0;
newInfo.vtotal = size.height();
newInfo.width = size.width();
newInfo.name_len = name.length();
auto cookie = xcb_randr_create_mode_unchecked(connection(), rootWindow(), newInfo, name.length(), name.toUtf8().constData());
ScopedCPointer<xcb_randr_create_mode_reply_t> reply(xcb_randr_create_mode_reply(connection(), cookie, nullptr));
if (!reply.isNull()) {
return reply->mode;
}
return XCB_NONE;
}
static xcb_randr_mode_t getModeForSize(const QSize &size, const xcb_randr_get_screen_resources_current_reply_t* r)
{
xcb_randr_mode_info_t *infos = xcb_randr_get_screen_resources_current_modes(r);
const int modeInfoLength = xcb_randr_get_screen_resources_current_modes_length(r);
// check available modes
for (int i = 0; i < modeInfoLength; ++i) {
xcb_randr_mode_info_t modeInfo = infos[i];
if (modeInfo.width == size.width() && modeInfo.height == size.height()) {
qDebug() << "Found our required mode";
return modeInfo.id;
}
}
// did not find our mode, so create it
return createNewMode(size);
}
static bool addModeToOutput(xcb_randr_output_t output, xcb_randr_mode_t mode)
{
ScopedCPointer<xcb_randr_get_output_info_reply_t> info(xcb_randr_get_output_info_reply(connection(),
xcb_randr_get_output_info(connection(), output, XCB_TIME_CURRENT_TIME), nullptr));
xcb_randr_mode_t *modes = xcb_randr_get_output_info_modes(info.data());
for (int i = 0; i < info->num_modes; ++i) {
if (modes[i] == mode) {
return true;
}
}
qDebug() << "Need to add the mode to output";
auto c = xcb_randr_add_output_mode_checked(connection(), output, mode);
ScopedCPointer<xcb_generic_error_t> error(xcb_request_check(connection(), c));
if (!error.isNull()) {
qDebug() << "Error while adding mode to output: " << error->error_code;
return false;
}
return true;
}
void WaylandScreens::updateXRandr()
{
if (!Xcb::Extensions::self()->isRandrAvailable()) {
qDebug() << "No RandR extension available, cannot sync with X";
return;
}
QRegion screens;
foreach (const QRect &rect, m_geometries) {
screens = screens.united(rect);
}
const QSize &size = screens.boundingRect().size();
if (size.isEmpty()) {
return;
}
RandR::CurrentResources currentResources(rootWindow());
xcb_randr_crtc_t crtc = getCrtc(currentResources.data());
if (crtc == XCB_NONE) {
return;
}
xcb_randr_output_t output = getOutputForCrtc(crtc);
if (output == XCB_NONE) {
return;
}
// first disable the first CRTC
xcb_randr_set_crtc_config(connection(), crtc, XCB_TIME_CURRENT_TIME, XCB_TIME_CURRENT_TIME,
0, 0, XCB_NONE, XCB_RANDR_ROTATION_ROTATE_0, 0, nullptr);
// then set new screen size
if (!setNewScreenSize(size)) {
return;
}
xcb_randr_mode_t mode = getModeForSize(size, currentResources.data());
if (mode == XCB_NONE) {
return;
}
if (!addModeToOutput(output, mode)) {
return;
}
// enable CRTC again
xcb_randr_set_crtc_config(connection(), crtc, XCB_TIME_CURRENT_TIME, XCB_TIME_CURRENT_TIME,
0, 0, mode, XCB_RANDR_ROTATION_ROTATE_0, 1, &output);
}
#endif
} // namespace