/****************************************************************************+
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**+
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** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).+
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** All rights reserved.+
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** Contact: Nokia Corporation (qt-info@nokia.com)+
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**+
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** This file is part of the tools module of the Qt Toolkit.+
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**+
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** $QT_BEGIN_LICENSE:LGPL$+
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** No Commercial Usage+
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** This file contains pre-release code and may not be distributed.+
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** You may use this file in accordance with the terms and conditions+
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** contained in the Technology Preview License Agreement accompanying+
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** this package.+
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**+
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** GNU Lesser General Public License Usage+
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** Alternatively, this file may be used under the terms of the GNU Lesser+
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** General Public License version 2.1 as published by the Free Software+
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** Foundation and appearing in the file LICENSE.LGPL included in the+
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** packaging of this file.  Please review the following information to+
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** ensure the GNU Lesser General Public License version 2.1 requirements+
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** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.+
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**+
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** In addition, as a special exception, Nokia gives you certain additional+
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** rights.  These rights are described in the Nokia Qt LGPL Exception+
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.+
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**+
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** If you have questions regarding the use of this file, please contact+
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** Nokia at qt-info@nokia.com.+
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**+
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**+
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**+
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**+
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**+
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**+
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**+
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**+
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** $QT_END_LICENSE$+
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**+
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****************************************************************************/+
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+
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#include "qvfbx11view.h"+
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#include "x11keyfaker.h"+
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#include <qevent.h>+
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#include <QX11Info>+
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#include <QTimer>+
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#include <QProcess>+
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#include <QDebug>+
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#include <QUuid>+
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#include <QDataStream>+
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#include <QTemporaryFile>+
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#include <X11/Xlib.h>+
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+
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QT_BEGIN_NAMESPACE+
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+
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QVFbX11View::QVFbX11View+
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	(int id, int w, int h, int d, Rotation r, QWidget *parent)+
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    : QVFbAbstractView(parent)+
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{+
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    this->id = id;+
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    this->w = w;+
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    this->h = h;+
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    this->d = d;+
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    this->rotation = r;+
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    this->gr = 1.0;+
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    this->gg = 1.0;+
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    this->gb = 1.0;+
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    this->touchscreen = false;+
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    this->lcd = false;+
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    this->keyFaker = 0;+
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    this->xnest = 0;+
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    this->serverAuthFile = 0;+
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    this->shutdown = false;+
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+
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    // Try to find Xephyr, as it is better than Xnest in many ways.+
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    if (QFile::exists("/usr/bin/Xephyr"))+
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        xserver = "/usr/bin/Xephyr";+
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    else if (QFile::exists("/usr/local/bin/Xephyr"))+
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        xserver = "/usr/local/bin/Xephyr";+
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    else if (QFile::exists("/usr/X11R6/bin/Xephyr"))+
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        xserver = "/usr/X11R6/bin/Xephyr";+
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    else+
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        xserver = "Xnest";+
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}+
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+
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QVFbX11View::~QVFbX11View()+
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{+
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    shutdown = true;+
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    if (xnest) {+
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	xnest->terminate();+
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	xnestStopped();+
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    }+
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}+
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+
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int QVFbX11View::displayId() const+
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{+
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    return id;+
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}+
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+
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int QVFbX11View::displayWidth() const+
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{+
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    return ( (int)rotation & 0x01 ) ? h : w;+
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}+
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+
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int QVFbX11View::displayHeight() const+
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{+
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    return ( (int)rotation & 0x01 ) ? w : h;+
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}+
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+
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int QVFbX11View::displayDepth() const+
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{+
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    return d;+
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}+
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+
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QVFbX11View::Rotation QVFbX11View::displayRotation() const+
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{+
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    return rotation;+
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}+
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+
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void QVFbX11View::skinKeyPressEvent(int code, const QString&, bool)+
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{+
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    if (keyFaker)+
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	keyFaker->sendKeyEvent(code, true);+
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}+
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+
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void QVFbX11View::skinKeyReleaseEvent(int code, const QString&, bool)+
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{+
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    if (keyFaker)+
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	keyFaker->sendKeyEvent(code, false);+
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}+
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+
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void QVFbX11View::setGamma(double gr, double gg, double gb)+
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{+
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    // We remember the values, but don't do anything with them.+
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    this->gr = gr;+
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    this->gg = gg;+
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    this->gb = gb;+
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}+
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+
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double QVFbX11View::gammaRed() const+
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{+
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    return gr;+
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}+
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+
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double QVFbX11View::gammaGreen() const+
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{+
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    return gg;+
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}+
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+
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double QVFbX11View::gammaBlue() const+
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{+
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    return gb;+
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}+
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+
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void QVFbX11View::getGamma(int, QRgb& rgb)+
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{+
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    rgb = qRgb(255, 255, 255);+
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}+
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+
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bool QVFbX11View::touchScreenEmulation() const+
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{+
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    return touchscreen;+
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}+
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+
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bool QVFbX11View::lcdScreenEmulation() const+
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{+
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    return lcd;+
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}+
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+
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int QVFbX11View::rate()+
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{+
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    // We don't support refresh rates, so return a default value.+
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    return 30;+
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}+
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+
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bool QVFbX11View::animating() const+
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{+
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    // We don't support animation.+
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    return false;+
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}+
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+
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QImage QVFbX11View::image() const+
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{+
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    // We don't support image capture.+
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    return QImage();+
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}+
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+
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void QVFbX11View::setRate(int)+
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{+
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    // We don't support rate adjustments.+
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}+
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+
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+
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double QVFbX11View::zoomH() const+
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{+
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    // Zoom is not possible with Xnest.+
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    return 1.0;+
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}+
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+
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double QVFbX11View::zoomV() const+
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{+
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    // Zoom is not possible with Xnest.+
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    return 1.0;+
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}+
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+
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QSize QVFbX11View::sizeHint() const+
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{+
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    return QSize(w, h);+
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}+
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+
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void QVFbX11View::setTouchscreenEmulation( bool flag )+
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{+
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    touchscreen = flag;+
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}+
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+
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void QVFbX11View::setLcdScreenEmulation( bool flag )+
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{+
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    lcd = flag;+
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}+
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+
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void QVFbX11View::setZoom( double, double )+
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{+
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    // Zoom is not possible with Xnest.+
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}+
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+
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void QVFbX11View::setRotation( Rotation )+
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{+
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    // Rotation is not possible with Xnest.+
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}+
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+
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void QVFbX11View::startAnimation( const QString& )+
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{+
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    // Animation is not supported.+
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}+
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+
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void QVFbX11View::stopAnimation()+
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{+
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    // Animation is not supported.+
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}+
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+
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// Generate a 16-byte magic cookie string.+
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static QString generateMagicCookie()+
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{+
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    static const char hexchars[] = "0123456789abcdef";+
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    QUuid uuid = QUuid::createUuid();+
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    QByteArray ba;+
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    QDataStream stream(&ba, QIODevice::WriteOnly);+
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    stream << uuid;+
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    QString value;+
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    foreach ( char ch, ba ) {+
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	value += QChar( hexchars[(ch >> 4) & 0x0F] );+
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	value += QChar( hexchars[ch & 0x0F] );+
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    }+
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    return value;+
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}+
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+
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void QVFbX11View::showEvent(QShowEvent *e)+
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{+
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    if (!xnest)+
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	startXnest();+
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    QWidget::showEvent(e);+
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}+
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+
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void QVFbX11View::keyPressEvent(QKeyEvent *e)+
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{+
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    if (keyFaker)+
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	keyFaker->sendKeyEvent(e->key(), true);+
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    QWidget::keyPressEvent(e);+
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}+
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+
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void QVFbX11View::keyReleaseEvent(QKeyEvent *e)+
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{+
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    if (keyFaker)+
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	keyFaker->sendKeyEvent(e->key(), false);+
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    QWidget::keyReleaseEvent(e);+
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}+
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+
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void QVFbX11View::startXnest()+
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{+
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    // Add authentication credentials to the XAUTHORITY file.+
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    QString cookie = generateMagicCookie();+
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    QStringList xauthargs;+
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    xauthargs += "add";+
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    xauthargs += ":" + QString::number(displayId());+
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    xauthargs += "MIT-MAGIC-COOKIE-1";+
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    xauthargs += cookie;+
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    if (QProcess::execute("xauth", xauthargs) != 0)+
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	qWarning() << "xauth: failed to add Xnest client authentication credentials";+
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+
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    // Write the credentials to another authentication file for the server.+
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    serverAuthFile = new QTemporaryFile(this);+
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    QString authFilename;+
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    if (serverAuthFile->open()) {+
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	authFilename = serverAuthFile->fileName();+
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	serverAuthFile->close();+
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	xauthargs.clear();+
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	xauthargs += "-f";+
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	xauthargs += authFilename;+
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	xauthargs += "add";+
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	xauthargs += ":" + QString::number(displayId());+
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	xauthargs += "MIT-MAGIC-COOKIE-1";+
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	xauthargs += cookie;+
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	if (QProcess::execute("xauth", xauthargs) != 0)+
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	    qWarning() << "xauth: failed to add Xnest server authentication credentials";+
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    }+
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+
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    // Create a raw X11 window to act as the Xnest's root window.+
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    // We cannot use winId() directly because qvfb is already+
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    // selecting for events that Xnest wants to select for.+
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    WId root = XCreateSimpleWindow+
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	(QX11Info::display(), winId(), 0, 0, w, h, 0,+
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	 BlackPixel(QX11Info::display(), QX11Info::appScreen()),+
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	 BlackPixel(QX11Info::display(), QX11Info::appScreen()));+
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    XMapWindow(QX11Info::display(), root);+
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+
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    // Warn the user if the visual number looks wrong.  Xnest expects+
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    // its root window to be on the default visual.+
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    if (QX11Info::appVisual() != DefaultVisual(QX11Info::display(), QX11Info::appScreen())) {+
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	qWarning() << "*** Qt is not using the default visual.  Xnest may fail "+
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		      "with a BadMatch error.";+
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	qWarning() << "*** If it fails, then restart qvfb with \" -visual"+
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		   << DefaultVisual(QX11Info::display(), QX11Info::appScreen())+
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			    ->visualid << "\"";+
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    }+
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+
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    // Make sure the root window is in the X server before Xnest starts.+
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    XSync(QX11Info::display(), False);+
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+
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    // Start the Xnest process.+
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    xnest = new QProcess(this);+
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    connect(xnest, SIGNAL(error(QProcess::ProcessError)),+
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	    this, SLOT(xnestStopped()));+
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    connect(xnest, SIGNAL(finished(int,QProcess::ExitStatus)),+
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	    this, SLOT(xnestStopped()));+
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    QStringList args;+
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    args += "-auth";+
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    args += authFilename;+
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    if (!xserver.contains("Xephyr")) {+
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        args += "-geometry";+
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        args += QString::number(w) + "x" + QString::number(h) + "+0+0";+
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        args += "-depth";+
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        args += QString::number(d);+
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    }+
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    args += "-br";	    // Start Xnest with a black background.+
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    args += "-parent";+
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    args += "0x" + QString::number(root, 16);+
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    args += ":" + QString::number(displayId());+
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    xnest->setProcessChannelMode(QProcess::ForwardedChannels);+
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    xnest->start(xserver, args);+
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    //qDebug() << args;+
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+
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    QTimer::singleShot(200, this, SLOT(startKeyFaker()));+
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}+
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+
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void QVFbX11View::xnestStopped()+
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{+
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    if (!shutdown) {+
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	if (xnest && xnest->error() == QProcess::FailedToStart)+
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	    qWarning() << xserver << "could not be started";+
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	else+
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	    qWarning() << xserver << "stopped unexpectedly";+
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    }+
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    if (keyFaker) {+
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	delete keyFaker;+
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	keyFaker = 0;+
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    }+
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    if (xnest) {+
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	xnest->deleteLater();+
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	xnest = 0;+
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+
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	QStringList xauthargs;+
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	xauthargs += "remove";+
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	xauthargs += ":" + QString::number(displayId());+
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	if (QProcess::execute("xauth", xauthargs) != 0)+
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	    qWarning() << "xauth: failed to remove Xnest authentication credentials";+
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    }+
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    if (serverAuthFile) {+
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	delete serverAuthFile;+
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	serverAuthFile = 0;+
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    }+
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}+
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+
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void QVFbX11View::startKeyFaker()+
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{+
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    if (!keyFaker && xnest)+
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	keyFaker = new X11KeyFaker(":" + QString::number(displayId()), this);+
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}+
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+
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QT_END_NAMESPACE+
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