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/*
* Copyright (c) 2012-2015 Christian Surlykke, Petr Vanek
*
* This file is part of qt-lightdm-greeter
* It is distributed under the LGPL 2.1 or later license.
* Please refer to the LICENSE file for a copy of the license.
*/
#include <QtWidgets/QApplication>
#include <QDesktopWidget>
#include <QtGlobal>
#include <QtDebug>
#include <QSettings>
#include <QIcon>
#include <QPainter>
#include <QMap>
#include <QSocketNotifier>
#include <fcntl.h> /* Obtain O_* constant definitions */
#include <unistd.h>
#include <signal.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <iostream>
#include "settings.h"
#include "mainwindow.h"
#include "x11util.h"
#include "global.h"
Settings *s_settings = new Settings();
static int sockets[2];
static void createSimpleBackground();
static void sigUsr1(int);
static void messageHandler(QtMsgType type, const QMessageLogContext&, const QString& msg)
{
std::cerr << type << ": " << msg.toUtf8().constData() << '\n';
}
static inline int size(const QRect& r)
{
return r.width() * r.height();
}
int main(int argc, char *argv[])
{
if (argc > 1 && QString(argv[1]) == QString("--test")) {
Global::enableTestMode();
}
QApplication a(argc, argv);
// I have no idea why, but Qt's stock qWarning() output never makes it
// to /var/log/lightdm/x-0-greeter.log, so we use std::cerr instead..
qInstallMessageHandler(messageHandler);
if (!Settings::iconThemeName().isEmpty()) {
QIcon::setThemeName(Settings::iconThemeName());
}
if (!Global::testMode() && !Settings::autoLoginCheckCmd().isEmpty()) {
QProcess p;
int ret = QProcess::execute(Settings::autoLoginCheckCmd());
if (ret == 0) {
if (Global::autoLoginGuest()) {
qWarning() << "Guest login ok";
createSimpleBackground();
return a.exec();
} else {
qWarning() << "Guest login failed";
// TODO: Set error message, display somewhere
}
}
}
// Build background for X server, in case we start a session that
// doesn't set one on its own this will make sure it's not simply
// black
QImage entire;
// Get a list of non-overlapping screens, as this might lead to a broken
// greeter with main windows covering other login forms
QMap<int, QRect> screens;
if (Global::testMode()) {
screens.insert(0, QRect(0, 0, 1024, 768));
} else {
QSize desktopSize = QApplication::desktop()->size();
qWarning() << "Desktop full size is " << desktopSize;
entire = QImage(desktopSize, QImage::Format_RGB32);
for (int i = 0; i < QApplication::desktop()->screenCount(); ++i) {
QRect r = QApplication::desktop()->screenGeometry(i);
QMutableMapIterator<int, QRect>it(screens);
while (it.hasNext()) {
it.next();
if (!it.value().intersects(r))
continue;
// Overlap, bigger wins
if (size(it.value()) >= size(r)) {
// Existing is bigger
goto skip_rect;
}
// New is bigger, remove existing and keep going
it.remove();
}
// We reached here, so add new window
screens.insert(i, r);
skip_rect: ; // Do nothing
}
}
// Determine primary screen
int primary;
if (screens.contains(QApplication::desktop()->primaryScreen())) {
// Primary screen still in selection
primary = QApplication::desktop()->primaryScreen();
} else {
// Fallback to first one
primary = screens.begin().key();
}
struct sigaction usr1;
usr1.sa_handler = &sigUsr1;
sigemptyset(&usr1.sa_mask);
usr1.sa_flags = SA_RESTART;
QSocketNotifier *sn = nullptr;
if (sigaction(SIGUSR1, &usr1, nullptr) == 0 && ::socketpair(AF_UNIX, SOCK_STREAM, 0, sockets) == 0) {
sn = new QSocketNotifier(sockets[1], QSocketNotifier::Read);
QObject::connect(sn, &QSocketNotifier::activated, [](int fd) {
char tmp[1000];
read(fd, tmp, sizeof tmp);
});
}
// Now set up all the screens
QPainter painter(&entire);
MainWindow *focusWindow = nullptr;
QMapIterator<int, QRect> it(screens);
while (it.hasNext()) {
it.next();
MainWindow *w = new MainWindow(primary == it.key(), it.key(), it.value());
w->show();
if (sn != nullptr) {
QObject::connect(sn, SIGNAL(activated(int)), w, SLOT(showStandby()));
}
if (w->showLoginForm()) {
focusWindow = w;
}
if (!entire.isNull()) {
QPoint p = it.value().topLeft();
painter.drawImage(p, w->getBackground());
}
}
if (!entire.isNull()) {
qWarning() << "Setting x background";
AddPixmapToBackground(entire.constBits(), entire.width(), entire.height(),
24, entire.bytesPerLine(), entire.byteCount());
}
// Ensure we set the primary screen's widget as active when there
// are more screens
if (focusWindow) {
focusWindow->setFocus(Qt::OtherFocusReason);
focusWindow->activateWindow();
}
return a.exec();
}
static void createSimpleBackground()
{
QImage img = Global::getConfigGradient();
if (img.isNull())
return;
img = img.scaled(QApplication::desktop()->size(), Qt::IgnoreAspectRatio, Qt::SmoothTransformation);
AddPixmapToBackground(img.constBits(), img.width(), img.height(),
24, img.bytesPerLine(), img.byteCount());
}
static void sigUsr1(int)
{
char a = 1;
::write(sockets[0], &a, sizeof(a));
}
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