Initial import from the monolithic Qt.

This is the beginning of revision history for this module. If you
want to look at revision history older than this, please refer to the
Qt Git wiki for how to use Git history grafting. At the time of
writing, this wiki is located here:

http://qt.gitorious.org/qt/pages/GitIntroductionWithQt

If you have already performed the grafting and you don't see any
history beyond this commit, try running "git log" with the "--follow"
argument.

Branched from the monolithic repo, Qt master branch, at commit
896db169ea224deb96c59ce8af800d019de63f12

1 files changed, 1935 insertions, 0 deletions

diff --git a/src/plugins/platforms/vnc/qvncserver.cpp b/src/plugins/platforms/vnc/qvncserver.cpp
new file mode 100644
index 0000000000..be2de7c007
--- /dev/null
+++ b/src/plugins/platforms/vnc/qvncserver.cpp
@@ -0,0 +1,1935 @@
+/****************************************************************************
+**
+** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the plugins of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the Technology Preview License Agreement accompanying
+** this package.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights.  These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qvncserver.h"
+
+#include <QtCore/qtimer.h>
+#include <QtCore/qregexp.h>
+#include <QtGui/qwidget.h>
+#include <QtGui/qpolygon.h>
+#include <QtGui/qpainter.h>
+
+#include <QtGui/qevent.h>
+#include <QWindowSystemInterface>
+
+#include <qplatformdefs.h>
+
+#include <qdebug.h>
+
+#include <stdlib.h>
+
+
+#define QT_QWS_VNC_DEBUG
+#define QT_NO_QWS_CURSOR //###
+
+
+QT_BEGIN_NAMESPACE
+
+
+
+//copied from qscreen_qws.h
+#ifndef QT_QWS_DEPTH16_RGB
+#define QT_QWS_DEPTH16_RGB 565
+#endif
+static const int qt_rbits = (QT_QWS_DEPTH16_RGB/100);
+static const int qt_gbits = (QT_QWS_DEPTH16_RGB/10%10);
+static const int qt_bbits = (QT_QWS_DEPTH16_RGB%10);
+static const int qt_red_shift = qt_bbits+qt_gbits-(8-qt_rbits);
+static const int qt_green_shift = qt_bbits-(8-qt_gbits);
+static const int qt_neg_blue_shift = 8-qt_bbits;
+static const int qt_blue_mask = (1<<qt_bbits)-1;
+static const int qt_green_mask = (1<<(qt_gbits+qt_bbits))-(1<<qt_bbits);
+static const int qt_red_mask = (1<<(qt_rbits+qt_gbits+qt_bbits))-(1<<(qt_gbits+qt_bbits));
+
+static const int qt_red_rounding_shift = qt_red_shift + qt_rbits;
+static const int qt_green_rounding_shift = qt_green_shift + qt_gbits;
+static const int qt_blue_rounding_shift = qt_bbits - qt_neg_blue_shift;
+
+
+inline QRgb qt_conv16ToRgb(ushort c)
+{
+    const int r=(c & qt_red_mask);
+    const int g=(c & qt_green_mask);
+    const int b=(c & qt_blue_mask);
+    const int tr = r >> qt_red_shift | r >> qt_red_rounding_shift;
+    const int tg = g >> qt_green_shift | g >> qt_green_rounding_shift;
+    const int tb = b << qt_neg_blue_shift | b >> qt_blue_rounding_shift;
+
+    return qRgb(tr,tg,tb);
+}
+
+
+
+//===========================================================================
+
+static const struct {
+    int keysym;
+    int keycode;
+} keyMap[] = {
+    { 0xff08, Qt::Key_Backspace },
+    { 0xff09, Qt::Key_Tab       },
+    { 0xff0d, Qt::Key_Return    },
+    { 0xff1b, Qt::Key_Escape    },
+    { 0xff63, Qt::Key_Insert    },
+    { 0xffff, Qt::Key_Delete    },
+    { 0xff50, Qt::Key_Home      },
+    { 0xff57, Qt::Key_End       },
+    { 0xff55, Qt::Key_PageUp    },
+    { 0xff56, Qt::Key_PageDown  },
+    { 0xff51, Qt::Key_Left      },
+    { 0xff52, Qt::Key_Up        },
+    { 0xff53, Qt::Key_Right     },
+    { 0xff54, Qt::Key_Down      },
+    { 0xffbe, Qt::Key_F1        },
+    { 0xffbf, Qt::Key_F2        },
+    { 0xffc0, Qt::Key_F3        },
+    { 0xffc1, Qt::Key_F4        },
+    { 0xffc2, Qt::Key_F5        },
+    { 0xffc3, Qt::Key_F6        },
+    { 0xffc4, Qt::Key_F7        },
+    { 0xffc5, Qt::Key_F8        },
+    { 0xffc6, Qt::Key_F9        },
+    { 0xffc7, Qt::Key_F10       },
+    { 0xffc8, Qt::Key_F11       },
+    { 0xffc9, Qt::Key_F12       },
+    { 0xffe1, Qt::Key_Shift     },
+    { 0xffe2, Qt::Key_Shift     },
+    { 0xffe3, Qt::Key_Control   },
+    { 0xffe4, Qt::Key_Control   },
+    { 0xffe7, Qt::Key_Meta      },
+    { 0xffe8, Qt::Key_Meta      },
+    { 0xffe9, Qt::Key_Alt       },
+    { 0xffea, Qt::Key_Alt       },
+    { 0, 0 }
+};
+
+void QRfbRect::read(QTcpSocket *s)
+{
+    quint16 buf[4];
+    s->read((char*)buf, 8);
+    x = ntohs(buf[0]);
+    y = ntohs(buf[1]);
+    w = ntohs(buf[2]);
+    h = ntohs(buf[3]);
+}
+
+void QRfbRect::write(QTcpSocket *s) const
+{
+    quint16 buf[4];
+    buf[0] = htons(x);
+    buf[1] = htons(y);
+    buf[2] = htons(w);
+    buf[3] = htons(h);
+    s->write((char*)buf, 8);
+}
+
+void QRfbPixelFormat::read(QTcpSocket *s)
+{
+    char buf[16];
+    s->read(buf, 16);
+    bitsPerPixel = buf[0];
+    depth = buf[1];
+    bigEndian = buf[2];
+    trueColor = buf[3];
+
+    quint16 a = ntohs(*(quint16 *)(buf + 4));
+    redBits = 0;
+    while (a) { a >>= 1; redBits++; }
+
+    a = ntohs(*(quint16 *)(buf + 6));
+    greenBits = 0;
+    while (a) { a >>= 1; greenBits++; }
+
+    a = ntohs(*(quint16 *)(buf + 8));
+    blueBits = 0;
+    while (a) { a >>= 1; blueBits++; }
+
+    redShift = buf[10];
+    greenShift = buf[11];
+    blueShift = buf[12];
+}
+
+void QRfbPixelFormat::write(QTcpSocket *s)
+{
+    char buf[16];
+    buf[0] = bitsPerPixel;
+    buf[1] = depth;
+    buf[2] = bigEndian;
+    buf[3] = trueColor;
+
+    quint16 a = 0;
+    for (int i = 0; i < redBits; i++) a = (a << 1) | 1;
+    *(quint16 *)(buf + 4) = htons(a);
+
+    a = 0;
+    for (int i = 0; i < greenBits; i++) a = (a << 1) | 1;
+    *(quint16 *)(buf + 6) = htons(a);
+
+    a = 0;
+    for (int i = 0; i < blueBits; i++) a = (a << 1) | 1;
+    *(quint16 *)(buf + 8) = htons(a);
+
+    buf[10] = redShift;
+    buf[11] = greenShift;
+    buf[12] = blueShift;
+    s->write(buf, 16);
+}
+
+
+void QRfbServerInit::setName(const char *n)
+{
+    delete[] name;
+    name = new char [strlen(n) + 1];
+    strcpy(name, n);
+}
+
+void QRfbServerInit::read(QTcpSocket *s)
+{
+    s->read((char *)&width, 2);
+    width = ntohs(width);
+    s->read((char *)&height, 2);
+    height = ntohs(height);
+    format.read(s);
+
+    quint32 len;
+    s->read((char *)&len, 4);
+    len = ntohl(len);
+
+    name = new char [len + 1];
+    s->read(name, len);
+    name[len] = '\0';
+}
+
+void QRfbServerInit::write(QTcpSocket *s)
+{
+    quint16 t = htons(width);
+    s->write((char *)&t, 2);
+    t = htons(height);
+    s->write((char *)&t, 2);
+    format.write(s);
+    quint32 len = strlen(name);
+    len = htonl(len);
+    s->write((char *)&len, 4);
+    s->write(name, strlen(name));
+}
+
+bool QRfbSetEncodings::read(QTcpSocket *s)
+{
+    if (s->bytesAvailable() < 3)
+        return false;
+
+    char tmp;
+    s->read(&tmp, 1);        // padding
+    s->read((char *)&count, 2);
+    count = ntohs(count);
+
+    return true;
+}
+
+bool QRfbFrameBufferUpdateRequest::read(QTcpSocket *s)
+{
+    if (s->bytesAvailable() < 9)
+        return false;
+
+    s->read(&incremental, 1);
+    rect.read(s);
+
+    return true;
+}
+
+bool QRfbKeyEvent::read(QTcpSocket *s)
+{
+    if (s->bytesAvailable() < 7)
+        return false;
+
+    s->read(&down, 1);
+    quint16 tmp;
+    s->read((char *)&tmp, 2);  // padding
+
+    quint32 key;
+    s->read((char *)&key, 4);
+    key = ntohl(key);
+
+    unicode = 0;
+    keycode = 0;
+    int i = 0;
+    while (keyMap[i].keysym && !keycode) {
+        if (keyMap[i].keysym == (int)key)
+            keycode = keyMap[i].keycode;
+        i++;
+    }
+    if (!keycode) {
+        if (key <= 0xff) {
+            unicode = key;
+            if (key >= 'a' && key <= 'z')
+                keycode = Qt::Key_A + key - 'a';
+            else if (key >= ' ' && key <= '~')
+                keycode = Qt::Key_Space + key - ' ';
+        }
+    }
+
+    return true;
+}
+
+bool QRfbPointerEvent::read(QTcpSocket *s)
+{
+    if (s->bytesAvailable() < 5)
+        return false;
+
+    char buttonMask;
+    s->read(&buttonMask, 1);
+
+    buttons = Qt::NoButton;
+    wheelDirection = WheelNone;
+    if (buttonMask & 1)
+        buttons |= Qt::LeftButton;
+    if (buttonMask & 2)
+        buttons |= Qt::MidButton;
+    if (buttonMask & 4)
+        buttons |= Qt::RightButton;
+    if (buttonMask & 8)
+        wheelDirection = WheelUp;
+    if (buttonMask & 16)
+        wheelDirection = WheelDown;
+    if (buttonMask & 32)
+        wheelDirection = WheelLeft;
+    if (buttonMask & 64)
+        wheelDirection = WheelRight;
+
+    quint16 tmp;
+    s->read((char *)&tmp, 2);
+    x = ntohs(tmp);
+    s->read((char *)&tmp, 2);
+    y = ntohs(tmp);
+
+    return true;
+}
+
+bool QRfbClientCutText::read(QTcpSocket *s)
+{
+    if (s->bytesAvailable() < 7)
+        return false;
+
+    char tmp[3];
+    s->read(tmp, 3);        // padding
+    s->read((char *)&length, 4);
+    length = ntohl(length);
+
+    return true;
+}
+
+//===========================================================================
+
+QVNCServer::QVNCServer(QVNCScreen *screen)
+    : qvnc_screen(screen), cursor(0)
+{
+    init(5900);
+}
+
+QVNCServer::QVNCServer(QVNCScreen *screen, int id)
+    : qvnc_screen(screen), cursor(0)
+{
+    init(5900 + id);
+}
+
+void QVNCServer::init(uint port)
+{
+    qDebug() << "QVNCServer::init" << port;
+
+    handleMsg = false;
+    client = 0;
+    encodingsPending = 0;
+    cutTextPending = 0;
+    keymod = 0;
+    state = Unconnected;
+    dirtyCursor = false;
+
+    refreshRate = 25;
+    timer = new QTimer(this);
+    timer->setSingleShot(true);
+    connect(timer, SIGNAL(timeout()), this, SLOT(checkUpdate()));
+
+    serverSocket = new QTcpServer(this);
+    if (!serverSocket->listen(QHostAddress::Any, port))
+        qDebug() << "QVNCServer could not connect:" << serverSocket->errorString();
+    else
+        qDebug("QVNCServer created on port %d", port);
+
+    connect(serverSocket, SIGNAL(newConnection()), this, SLOT(newConnection()));
+
+#ifndef QT_NO_QWS_CURSOR
+    qvnc_cursor = 0;
+#endif
+    encoder = 0;
+}
+
+QVNCServer::~QVNCServer()
+{
+    delete encoder;
+    encoder = 0;
+    delete client;
+    client = 0;
+#ifndef QT_NO_QWS_CURSOR
+    delete qvnc_cursor;
+    qvnc_cursor = 0;
+#endif
+}
+
+void QVNCServer::setDirty()
+{
+    if (state == Connected && !timer->isActive() &&
+        ((dirtyMap()->numDirty > 0) || dirtyCursor)) {
+        timer->start();
+    }
+}
+
+void QVNCServer::newConnection()
+{
+    if (client)
+        delete client;
+
+    client = serverSocket->nextPendingConnection();
+    connect(client,SIGNAL(readyRead()),this,SLOT(readClient()));
+    connect(client,SIGNAL(disconnected()),this,SLOT(discardClient()));
+    handleMsg = false;
+    encodingsPending = 0;
+    cutTextPending = 0;
+    supportHextile = false;
+    wantUpdate = false;
+
+    timer->start(1000 / refreshRate);
+    dirtyMap()->reset();
+
+    // send protocol version
+    const char *proto = "RFB 003.003\n";
+    client->write(proto, 12);
+    state = Protocol;
+
+//     if (!qvnc_screen->screen())
+//         QWSServer::instance()->enablePainting(true);
+}
+
+void QVNCServer::readClient()
+{
+    switch (state) {
+        case Protocol:
+            if (client->bytesAvailable() >= 12) {
+                char proto[13];
+                client->read(proto, 12);
+                proto[12] = '\0';
+                qDebug("Client protocol version %s", proto);
+                // No authentication
+                quint32 auth = htonl(1);
+                client->write((char *) &auth, sizeof(auth));
+                state = Init;
+            }
+            break;
+
+        case Init:
+            if (client->bytesAvailable() >= 1) {
+                quint8 shared;
+                client->read((char *) &shared, 1);
+
+                // Server Init msg
+                QRfbServerInit sim;
+                QRfbPixelFormat &format = sim.format;
+                switch (qvnc_screen->depth()) {
+                case 32:
+                    format.bitsPerPixel = 32;
+                    format.depth = 32;
+                    format.bigEndian = 0;
+                    format.trueColor = true;
+                    format.redBits = 8;
+                    format.greenBits = 8;
+                    format.blueBits = 8;
+                    format.redShift = 16;
+                    format.greenShift = 8;
+                    format.blueShift = 0;
+                    break;
+
+                case 24:
+                    format.bitsPerPixel = 24;
+                    format.depth = 24;
+                    format.bigEndian = 0;
+                    format.trueColor = true;
+                    format.redBits = 8;
+                    format.greenBits = 8;
+                    format.blueBits = 8;
+                    format.redShift = 16;
+                    format.greenShift = 8;
+                    format.blueShift = 0;
+                    break;
+
+                case 18:
+                    format.bitsPerPixel = 24;
+                    format.depth = 18;
+                    format.bigEndian = 0;
+                    format.trueColor = true;
+                    format.redBits = 6;
+                    format.greenBits = 6;
+                    format.blueBits = 6;
+                    format.redShift = 12;
+                    format.greenShift = 6;
+                    format.blueShift = 0;
+                    break;
+
+                case 16:
+                    format.bitsPerPixel = 16;
+                    format.depth = 16;
+                    format.bigEndian = 0;
+                    format.trueColor = true;
+                    format.redBits = 5;
+                    format.greenBits = 6;
+                    format.blueBits = 5;
+                    format.redShift = 11;
+                    format.greenShift = 5;
+                    format.blueShift = 0;
+                    break;
+
+                case 15:
+                    format.bitsPerPixel = 16;
+                    format.depth = 15;
+                    format.bigEndian = 0;
+                    format.trueColor = true;
+                    format.redBits = 5;
+                    format.greenBits = 5;
+                    format.blueBits = 5;
+                    format.redShift = 10;
+                    format.greenShift = 5;
+                    format.blueShift = 0;
+                    break;
+
+                case 12:
+                    format.bitsPerPixel = 16;
+                    format.depth = 12;
+                    format.bigEndian = 0;
+                    format.trueColor = true;
+                    format.redBits = 4;
+                    format.greenBits = 4;
+                    format.blueBits = 4;
+                    format.redShift = 8;
+                    format.greenShift = 4;
+                    format.blueShift = 0;
+                    break;
+
+                case 8:
+                case 4:
+                    format.bitsPerPixel = 8;
+                    format.depth = 8;
+                    format.bigEndian = 0;
+                    format.trueColor = false;
+                    format.redBits = 0;
+                    format.greenBits = 0;
+                    format.blueBits = 0;
+                    format.redShift = 0;
+                    format.greenShift = 0;
+                    format.blueShift = 0;
+                    break;
+
+                default:
+                    qDebug("QVNC cannot drive depth %d", qvnc_screen->depth());
+                    discardClient();
+                    return;
+                }
+                sim.width = qvnc_screen->geometry().width();
+                sim.height = qvnc_screen->geometry().height();
+                sim.setName("Qt for Embedded Linux VNC Server");
+                sim.write(client);
+                state = Connected;
+            }
+            break;
+
+        case Connected:
+            do {
+                if (!handleMsg) {
+                    client->read((char *)&msgType, 1);
+                    handleMsg = true;
+                }
+                if (handleMsg) {
+                    switch (msgType ) {
+                    case SetPixelFormat:
+                        setPixelFormat();
+                        break;
+                    case FixColourMapEntries:
+                        qDebug("Not supported: FixColourMapEntries");
+                        handleMsg = false;
+                        break;
+                    case SetEncodings:
+                        setEncodings();
+                        break;
+                    case FramebufferUpdateRequest:
+                        frameBufferUpdateRequest();
+                        break;
+                    case KeyEvent:
+                        keyEvent();
+                        break;
+                    case PointerEvent:
+                        pointerEvent();
+                        break;
+                    case ClientCutText:
+                        clientCutText();
+                        break;
+                    default:
+                        qDebug("Unknown message type: %d", (int)msgType);
+                        handleMsg = false;
+                    }
+                }
+            } while (!handleMsg && client->bytesAvailable());
+            break;
+    default:
+        break;
+    }
+}
+
+#if 0//Q_BYTE_ORDER == Q_BIG_ENDIAN
+bool QVNCScreen::swapBytes() const
+{
+    if (depth() != 16)
+        return false;
+
+    if (screen())
+        return screen()->frameBufferLittleEndian();
+    return frameBufferLittleEndian();
+}
+#endif
+
+void QVNCServer::setPixelFormat()
+{
+    if (client->bytesAvailable() >= 19) {
+        char buf[3];
+        client->read(buf, 3); // just padding
+        pixelFormat.read(client);
+#ifdef QT_QWS_VNC_DEBUG
+        qDebug("Want format: %d %d %d %d %d %d %d %d %d %d",
+            int(pixelFormat.bitsPerPixel),
+            int(pixelFormat.depth),
+            int(pixelFormat.bigEndian),
+            int(pixelFormat.trueColor),
+            int(pixelFormat.redBits),
+            int(pixelFormat.greenBits),
+            int(pixelFormat.blueBits),
+            int(pixelFormat.redShift),
+            int(pixelFormat.greenShift),
+            int(pixelFormat.blueShift));
+#endif
+        if (!pixelFormat.trueColor) {
+            qDebug("Can only handle true color clients");
+            discardClient();
+        }
+        handleMsg = false;
+        sameEndian = (QSysInfo::ByteOrder == QSysInfo::BigEndian) == !!pixelFormat.bigEndian;
+        needConversion = pixelConversionNeeded();
+#if Q_BYTE_ORDER == Q_BIG_ENDIAN
+        swapBytes = qvnc_screen->swapBytes();
+#endif
+    }
+}
+
+void QVNCServer::setEncodings()
+{
+    QRfbSetEncodings enc;
+
+    if (!encodingsPending && enc.read(client)) {
+        encodingsPending = enc.count;
+        if (!encodingsPending)
+            handleMsg = false;
+    }
+
+    if (encoder) {
+        delete encoder;
+        encoder = 0;
+    }
+
+    enum Encodings {
+        Raw = 0,
+        CopyRect = 1,
+        RRE = 2,
+        CoRRE = 4,
+        Hextile = 5,
+        ZRLE = 16,
+        Cursor = -239,
+        DesktopSize = -223
+    };
+
+    supportCursor = false;
+
+    if (encodingsPending && (unsigned)client->bytesAvailable() >=
+                                encodingsPending * sizeof(quint32)) {
+        for (int i = 0; i < encodingsPending; ++i) {
+            qint32 enc;
+            client->read((char *)&enc, sizeof(qint32));
+            enc = ntohl(enc);
+#ifdef QT_QWS_VNC_DEBUG
+            qDebug("QVNCServer::setEncodings: %d", enc);
+#endif
+            switch (enc) {
+            case Raw:
+                if (!encoder) {
+                    encoder = new QRfbRawEncoder(this);
+#ifdef QT_QWS_VNC_DEBUG
+                    qDebug("QVNCServer::setEncodings: using raw");
+#endif
+                }
+               break;
+            case CopyRect:
+                supportCopyRect = true;
+                break;
+            case RRE:
+                supportRRE = true;
+                break;
+            case CoRRE:
+                supportCoRRE = true;
+                break;
+            case Hextile:
+                supportHextile = true;
+                if (encoder)
+                    break;
+                switch (qvnc_screen->depth()) {
+#ifdef QT_QWS_DEPTH_8
+                case 8:
+                    encoder = new QRfbHextileEncoder<quint8>(this);
+                    break;
+#endif
+#ifdef QT_QWS_DEPTH_12
+                case 12:
+                    encoder = new QRfbHextileEncoder<qrgb444>(this);
+                    break;
+#endif
+#ifdef QT_QWS_DEPTH_15
+                case 15:
+                    encoder = new QRfbHextileEncoder<qrgb555>(this);
+                    break;
+#endif
+#ifdef QT_QWS_DEPTH_16
+                case 16:
+                    encoder = new QRfbHextileEncoder<quint16>(this);
+                    break;
+#endif
+#ifdef QT_QWS_DEPTH_18
+                case 18:
+                    encoder = new QRfbHextileEncoder<qrgb666>(this);
+                    break;
+#endif
+#ifdef QT_QWS_DEPTH_24
+                case 24:
+                    encoder = new QRfbHextileEncoder<qrgb888>(this);
+                    break;
+#endif
+#ifdef QT_QWS_DEPTH_32
+                case 32:
+                    encoder = new QRfbHextileEncoder<quint32>(this);
+                    break;
+#endif
+                default:
+                    break;
+                }
+#ifdef QT_QWS_VNC_DEBUG
+                qDebug("QVNCServer::setEncodings: using hextile");
+#endif
+                break;
+            case ZRLE:
+                supportZRLE = true;
+                break;
+            case Cursor:
+                supportCursor = true;
+#ifndef QT_NO_QWS_CURSOR
+                if (!qvnc_screen->screen() || qt_screencursor->isAccelerated()) {
+                    delete qvnc_cursor;
+                    qvnc_cursor = new QVNCClientCursor(this);
+                }
+#endif
+                break;
+            case DesktopSize:
+                supportDesktopSize = true;
+                break;
+            default:
+                break;
+            }
+        }
+        handleMsg = false;
+        encodingsPending = 0;
+    }
+
+    if (!encoder) {
+        encoder = new QRfbRawEncoder(this);
+#ifdef QT_QWS_VNC_DEBUG
+        qDebug("QVNCServer::setEncodings: fallback using raw");
+#endif
+    }
+
+    if (cursor)
+        cursor->setCursorMode(supportCursor);
+}
+
+void QVNCServer::frameBufferUpdateRequest()
+{
+    QRfbFrameBufferUpdateRequest ev;
+
+    if (ev.read(client)) {
+        if (!ev.incremental) {
+            QRect r(ev.rect.x, ev.rect.y, ev.rect.w, ev.rect.h);
+////###            r.translate(qvnc_screen->offset());
+            qvnc_screen->d_ptr->setDirty(r, true);
+        }
+        wantUpdate = true;
+        checkUpdate();
+        handleMsg = false;
+    }
+}
+
+static bool buttonChange(Qt::MouseButtons before, Qt::MouseButtons after, Qt::MouseButton *button, bool *isPress)
+{
+    if (before == after)
+        return false;
+    for (int b = Qt::LeftButton;  b <= Qt::MidButton; b<<=1) {
+        if ((before & b) != (after & b)) {
+            *button = static_cast<Qt::MouseButton>(b);
+            *isPress = (after & b);
+            return true;
+        }
+    }
+    return false;
+}
+
+void QVNCServer::pointerEvent()
+{
+    QPoint screenOffset = this->screen()->geometry().topLeft();
+
+    QRfbPointerEvent ev;
+    if (ev.read(client)) {
+        QPoint eventPoint(ev.x, ev.y);
+        eventPoint += screenOffset;         // local to global translation
+
+        if (ev.wheelDirection == ev.WheelNone) {
+            QEvent::Type type = QEvent::MouseMove;
+            Qt::MouseButton button = Qt::NoButton;
+            bool isPress;
+            if (buttonChange(buttons, ev.buttons, &button, &isPress))
+                type = isPress ? QEvent::MouseButtonPress : QEvent::MouseButtonRelease;
+            QWindowSystemInterface::handleMouseEvent(0, eventPoint, eventPoint, ev.buttons);
+        } else {
+            // No buttons or motion reported at the same time as wheel events
+            Qt::Orientation orientation;
+            if (ev.wheelDirection == ev.WheelLeft || ev.wheelDirection == ev.WheelRight)
+                orientation = Qt::Horizontal;
+            else
+                orientation = Qt::Vertical;
+            int delta = 120 * ((ev.wheelDirection == ev.WheelLeft || ev.wheelDirection == ev.WheelUp) ? 1 : -1);
+            QWindowSystemInterface::handleWheelEvent(0, eventPoint, eventPoint, delta, orientation);
+        }
+        handleMsg = false;
+    }
+}
+
+void QVNCServer::keyEvent()
+{
+    QRfbKeyEvent ev;
+
+    if (ev.read(client)) {
+        if (ev.keycode == Qt::Key_Shift)
+            keymod = ev.down ? keymod | Qt::ShiftModifier :
+                               keymod & ~Qt::ShiftModifier;
+        else if (ev.keycode == Qt::Key_Control)
+            keymod = ev.down ? keymod | Qt::ControlModifier :
+                               keymod & ~Qt::ControlModifier;
+        else if (ev.keycode == Qt::Key_Alt)
+            keymod = ev.down ? keymod | Qt::AltModifier :
+                               keymod & ~Qt::AltModifier;
+        if (ev.unicode || ev.keycode) {
+//            qDebug() << "keyEvent" << hex << ev.unicode << ev.keycode <<  keymod << ev.down;
+            QEvent::Type type = ev.down ? QEvent::KeyPress : QEvent::KeyRelease;
+            QString str;
+            if (ev.unicode && ev.unicode != 0xffff)
+                str = QString(ev.unicode);
+            QWindowSystemInterface::handleKeyEvent(0, type, ev.keycode, keymod, str);
+        }
+        handleMsg = false;
+    }
+}
+
+void QVNCServer::clientCutText()
+{
+    QRfbClientCutText ev;
+
+    if (cutTextPending == 0 && ev.read(client)) {
+        cutTextPending = ev.length;
+        if (!cutTextPending)
+            handleMsg = false;
+    }
+
+    if (cutTextPending && client->bytesAvailable() >= cutTextPending) {
+        char *text = new char [cutTextPending+1];
+        client->read(text, cutTextPending);
+        delete [] text;
+        cutTextPending = 0;
+        handleMsg = false;
+    }
+}
+
+// stride in bytes
+template <class SRC>
+bool QRfbSingleColorHextile<SRC>::read(const uchar *data,
+                                       int width, int height, int stride)
+{
+    const int depth = encoder->server->screen()->depth();
+    if (width % (depth / 8)) // hw: should rather fallback to simple loop
+        return false;
+
+    static int alwaysFalse = qgetenv("QT_VNC_NOCHECKFILL").toInt();
+    if (alwaysFalse)
+        return false;
+
+    switch (depth) {
+    case 4: {
+        const quint8 *data8 = reinterpret_cast<const quint8*>(data);
+        if ((data8[0] & 0xf) != (data8[0] >> 4))
+            return false;
+        width /= 2;
+    } // fallthrough
+    case 8: {
+        const quint8 *data8 = reinterpret_cast<const quint8*>(data);
+        if (data8[0] != data8[1])
+            return false;
+        width /= 2;
+    } // fallthrough
+    case 12:
+    case 15:
+    case 16: {
+        const quint16 *data16 = reinterpret_cast<const quint16*>(data);
+        if (data16[0] != data16[1])
+            return false;
+        width /= 2;
+    } // fallthrough
+    case 18:
+    case 24:
+    case 32: {
+        const quint32 *data32 = reinterpret_cast<const quint32*>(data);
+        const quint32 first = data32[0];
+        const int linestep = (stride / sizeof(quint32)) - width;
+        for (int y = 0; y < height; ++y) {
+            for (int x = 0; x < width; ++x) {
+                if (*(data32++) != first)
+                    return false;
+            }
+            data32 += linestep;
+        }
+        break;
+    }
+    default:
+        return false;
+    }
+
+    SRC color = reinterpret_cast<const SRC*>(data)[0];
+    encoder->newBg |= (color != encoder->bg);
+    encoder->bg = color;
+    return true;
+}
+
+template <class SRC>
+void QRfbSingleColorHextile<SRC>::write(QTcpSocket *socket) const
+{
+    if (true || encoder->newBg) {
+        const int bpp = encoder->server->clientBytesPerPixel();
+        const int padding = 3;
+        QVarLengthArray<char> buffer(padding + 1 + bpp);
+        buffer[padding] = 2; // BackgroundSpecified
+        encoder->server->convertPixels(buffer.data() + padding + 1,
+                                       reinterpret_cast<char*>(&encoder->bg),
+                                       1);
+        socket->write(buffer.data() + padding, bpp + 1);
+//        encoder->newBg = false;
+    } else {
+        char subenc = 0;
+        socket->write(&subenc, 1);
+    }
+}
+
+template <class SRC>
+bool QRfbDualColorHextile<SRC>::read(const uchar *data,
+                                     int width, int height, int stride)
+{
+    const SRC *ptr = reinterpret_cast<const SRC*>(data);
+    const int linestep = (stride / sizeof(SRC)) - width;
+
+    SRC c1;
+    SRC c2 = 0;
+    int n1 = 0;
+    int n2 = 0;
+    int x = 0;
+    int y = 0;
+
+    c1 = *ptr;
+
+    // find second color
+    while (y < height) {
+        while (x < width) {
+            if (*ptr == c1) {
+                ++n1;
+            } else {
+                c2 = *ptr;
+                goto found_second_color;
+            }
+            ++ptr;
+            ++x;
+        }
+        x = 0;
+        ptr += linestep;
+        ++y;
+    }
+
+found_second_color:
+    // finish counting
+    while (y < height) {
+        while (x < width) {
+            if (*ptr == c1) {
+                ++n1;
+            } else if (*ptr == c2) {
+                ++n2;
+            } else {
+                return false;
+            }
+            ++ptr;
+            ++x;
+        }
+        x = 0;
+        ptr += linestep;
+        ++y;
+    }
+
+    if (n2 > n1) {
+        const quint32 tmpC = c1;
+        c1 = c2;
+        c2 = tmpC;
+    }
+
+    encoder->newBg |= (c1 != encoder->bg);
+    encoder->newFg |= (c2 != encoder->fg);
+
+    encoder->bg = c1;
+    encoder->fg = c2;
+
+    // create map
+    bool inRect = false;
+    numRects = 0;
+    ptr = reinterpret_cast<const SRC*>(data);
+    for (y = 0; y < height; ++y) {
+        for (x = 0; x < width; ++x) {
+            if (inRect && *ptr == encoder->bg) {
+                // rect finished
+                setWidth(x - lastx());
+                next();
+                inRect = false;
+            } else if (!inRect && *ptr == encoder->fg) {
+                // rect start
+                setX(x);
+                setY(y);
+                setHeight(1);
+                inRect = true;
+            }
+            ++ptr;
+        }
+        if (inRect) {
+            // finish rect
+            setWidth(width - lastx());
+            next();
+            inRect = false;
+        }
+        ptr += linestep;
+    }
+
+    return true;
+}
+
+template <class SRC>
+void QRfbDualColorHextile<SRC>::write(QTcpSocket *socket) const
+{
+    const int bpp = encoder->server->clientBytesPerPixel();
+    const int padding = 3;
+    QVarLengthArray<char> buffer(padding + 2 * bpp + sizeof(char) + sizeof(numRects));
+    char &subenc = buffer[padding];
+    int n = padding + sizeof(subenc);
+
+    subenc = 0x8; // AnySubrects
+
+    if (encoder->newBg) {
+        subenc |= 0x2; // Background
+        encoder->server->convertPixels(buffer.data() + n, (char*)&encoder->bg, 1);
+        n += bpp;
+//        encoder->newBg = false;
+    }
+
+    if (encoder->newFg) {
+        subenc |= 0x4; // Foreground
+        encoder->server->convertPixels(buffer.data() + n, (char*)&encoder->fg, 1);
+        n += bpp;
+//        encoder->newFg = false;
+    }
+    buffer[n] = numRects;
+    n += sizeof(numRects);
+
+    socket->write(buffer.data() + padding, n - padding);
+    socket->write((char*)rects, numRects * sizeof(Rect));
+}
+
+template <class SRC>
+void QRfbDualColorHextile<SRC>::next()
+{
+    for (int r = numRects - 1; r >= 0; --r) {
+        if (recty(r) == lasty())
+            continue;
+        if (recty(r) < lasty() - 1) // only search previous scanline
+            break;
+        if (rectx(r) == lastx() && width(r) == width(numRects)) {
+            ++rects[r].wh;
+            return;
+        }
+    }
+    ++numRects;
+}
+
+template <class SRC>
+inline void QRfbMultiColorHextile<SRC>::setColor(SRC color)
+{
+    encoder->server->convertPixels(reinterpret_cast<char*>(rect(numRects)),
+                                   (const char*)&color, 1);
+}
+
+template <class SRC>
+inline bool QRfbMultiColorHextile<SRC>::beginRect()
+{
+    if ((rects.size() + bpp + 2) > maxRectsSize)
+        return false;
+    rects.resize(rects.size() + bpp + 2);
+    return true;
+}
+
+template <class SRC>
+inline void QRfbMultiColorHextile<SRC>::endRect()
+{
+    setHeight(numRects, 1);
+    ++numRects;
+}
+
+template <class SRC>
+bool QRfbMultiColorHextile<SRC>::read(const uchar *data,
+                                      int width, int height, int stride)
+{
+    const SRC *ptr = reinterpret_cast<const SRC*>(data);
+    const int linestep = (stride / sizeof(SRC)) - width;
+
+    bpp = encoder->server->clientBytesPerPixel();
+
+    if (encoder->newBg)
+        encoder->bg = ptr[0];
+
+    const SRC bg = encoder->bg;
+    SRC color = bg;
+    bool inRect = false;
+
+    numRects = 0;
+    rects.clear();
+
+    for (int y = 0; y < height; ++y) {
+        for (int x = 0; x < width; ++x) {
+            if (inRect && *ptr != color) { // end rect
+                setWidth(numRects, x - rectx(numRects));
+                endRect();
+                inRect = false;
+            }
+
+            if (!inRect && *ptr != bg) { // begin rect
+                if (!beginRect())
+                    return false;
+                inRect = true;
+                color = *ptr;
+                setColor(color);
+                setX(numRects, x);
+                setY(numRects, y);
+            }
+            ++ptr;
+        }
+        if (inRect) { // end rect
+            setWidth(numRects, width - rectx(numRects));
+            endRect();
+            inRect = false;
+        }
+        ptr += linestep;
+    }
+
+    return true;
+}
+
+template <class SRC>
+void QRfbMultiColorHextile<SRC>::write(QTcpSocket *socket) const
+{
+    const int padding = 3;
+    QVarLengthArray<quint8> buffer(bpp + padding + sizeof(quint8) + sizeof(numRects));
+
+    quint8 &subenc = buffer[padding];
+    int n = padding + sizeof(quint8);
+
+    subenc = 8 | 16; // AnySubrects | SubrectsColoured
+
+    if (encoder->newBg) {
+        subenc |= 0x2; // Background
+        encoder->server->convertPixels(reinterpret_cast<char*>(buffer.data() + n),
+                                       reinterpret_cast<const char*>(&encoder->bg),
+                                       1);
+        n += bpp;
+//        encoder->newBg = false;
+    }
+
+    buffer[n] = numRects;
+    n += sizeof(numRects);
+
+    socket->write(reinterpret_cast<const char*>(buffer.data() + padding),
+                  n - padding);
+    socket->write(reinterpret_cast<const char*>(rects.constData()),
+                  rects.size());
+}
+
+bool QVNCServer::pixelConversionNeeded() const
+{
+    if (!sameEndian)
+        return true;
+
+#if Q_BYTE_ORDER == Q_BIG_ENDIAN
+    if (qvnc_screen->swapBytes())
+        return true;
+#endif
+
+    const int screendepth = qvnc_screen->depth();
+    if (screendepth != pixelFormat.bitsPerPixel)
+        return true;
+
+    switch (screendepth) {
+    case 32:
+    case 24:
+        return false;
+    case 18:
+        return (pixelFormat.redBits == 6
+                && pixelFormat.greenBits == 6
+                && pixelFormat.blueBits == 6);
+    case 16:
+        return (pixelFormat.redBits == 5
+                && pixelFormat.greenBits == 6
+                && pixelFormat.blueBits == 5);
+    case 15:
+        return (pixelFormat.redBits == 5
+                && pixelFormat.greenBits == 5
+                && pixelFormat.blueBits == 5);
+    case 12:
+        return (pixelFormat.redBits == 4
+                && pixelFormat.greenBits == 4
+                && pixelFormat.blueBits == 4);
+    }
+    return true;
+}
+
+// count: number of pixels
+void QVNCServer::convertPixels(char *dst, const char *src, int count) const
+{
+    const int screendepth = qvnc_screen->depth();
+    const bool isBgr = false; //### qvnc_screen->pixelType() == QScreen::BGRPixel;
+
+    // cutoffs
+#if Q_BYTE_ORDER == Q_BIG_ENDIAN
+    if (!swapBytes)
+#endif
+    if (sameEndian) {
+        if (screendepth == pixelFormat.bitsPerPixel) { // memcpy cutoffs
+
+            switch (screendepth) {
+            case 32:
+                memcpy(dst, src, count * sizeof(quint32));
+                return;
+            case 16:
+                if (pixelFormat.redBits == 5
+                    && pixelFormat.greenBits == 6
+                    && pixelFormat.blueBits == 5)
+                {
+                    memcpy(dst, src, count * sizeof(quint16));
+                    return;
+                }
+            }
+        } else if (screendepth == 16 && pixelFormat.bitsPerPixel == 32) {
+#if defined(__i386__) // Currently fails on ARM if dst is not 4 byte aligned
+            const quint32 *src32 = reinterpret_cast<const quint32*>(src);
+            quint32 *dst32 = reinterpret_cast<quint32*>(dst);
+            int count32 = count * sizeof(quint16) / sizeof(quint32);
+            while (count32--) {
+                const quint32 s = *src32++;
+                quint32 result1;
+                quint32 result2;
+
+                // red
+                result1 = ((s & 0xf8000000) | ((s & 0xe0000000) >> 5)) >> 8;
+                result2 = ((s & 0x0000f800) | ((s & 0x0000e000) >> 5)) << 8;
+
+                // green
+                result1 |= ((s & 0x07e00000) | ((s & 0x06000000) >> 6)) >> 11;
+                result2 |= ((s & 0x000007e0) | ((s & 0x00000600) >> 6)) << 5;
+
+                // blue
+                result1 |= ((s & 0x001f0000) | ((s & 0x001c0000) >> 5)) >> 13;
+                result2 |= ((s & 0x0000001f) | ((s & 0x0000001c) >> 5)) << 3;
+
+                *dst32++ = result2;
+                *dst32++ = result1;
+            }
+            if (count & 0x1) {
+                const quint16 *src16 = reinterpret_cast<const quint16*>(src);
+                *dst32 = qt_conv16ToRgb(src16[count - 1]);
+            }
+            return;
+#endif
+        }
+    }
+
+    const int bytesPerPixel = (pixelFormat.bitsPerPixel + 7) / 8;
+
+//    nibble = 0;
+
+    for (int i = 0; i < count; ++i) {
+        int r, g, b;
+
+        switch (screendepth) {
+#if 0
+        case 4: {
+            if (!nibble) {
+                r = ((*src) & 0x0f) << 4;
+            } else {
+                r = (*src) & 0xf0;
+                src++;
+            }
+            nibble = !nibble;
+            g = b = r;
+            break;
+        }
+#endif
+#if 0
+        case 8: {
+            QRgb rgb = qvnc_screen->clut()[int(*src)];
+            r = qRed(rgb);
+            g = qGreen(rgb);
+            b = qBlue(rgb);
+            src++;
+            break;
+        }
+#endif
+#ifdef QT_QWS_DEPTH_12
+        case 12: {
+            quint32 p = quint32(*reinterpret_cast<const qrgb444*>(src));
+            r = qRed(p);
+            g = qGreen(p);
+            b = qBlue(p);
+            src += sizeof(qrgb444);
+            break;
+        }
+#endif
+#ifdef QT_QWS_DEPTH_15
+        case 15: {
+            quint32 p = quint32(*reinterpret_cast<const qrgb555*>(src));
+            r = qRed(p);
+            g = qGreen(p);
+            b = qBlue(p);
+            src += sizeof(qrgb555);
+            break;
+        }
+#endif
+        case 16: {
+            quint16 p = *reinterpret_cast<const quint16*>(src);
+#if Q_BYTE_ORDER == Q_BIG_ENDIAN
+            if (swapBytes)
+                p = ((p & 0xff) << 8) | ((p & 0xff00) >> 8);
+#endif
+            r = (p >> 11) & 0x1f;
+            g = (p >> 5) & 0x3f;
+            b = p & 0x1f;
+            r <<= 3;
+            g <<= 2;
+            b <<= 3;
+            src += sizeof(quint16);
+            break;
+        }
+#ifdef QT_QWS_DEPTH_18
+        case 18: {
+            quint32 p = quint32(*reinterpret_cast<const qrgb666*>(src));
+            r = qRed(p);
+            g = qGreen(p);
+            b = qBlue(p);
+            src += sizeof(qrgb666);
+            break;
+        }
+#endif
+#ifdef QT_QWS_DEPTH_24
+        case 24: {
+            quint32 p = quint32(*reinterpret_cast<const qrgb888*>(src));
+            r = qRed(p);
+            g = qGreen(p);
+            b = qBlue(p);
+            src += sizeof(qrgb888);
+            break;
+        }
+#endif
+        case 32: {
+            quint32 p = *reinterpret_cast<const quint32*>(src);
+            r = (p >> 16) & 0xff;
+            g = (p >> 8) & 0xff;
+            b = p & 0xff;
+            src += sizeof(quint32);
+            break;
+        }
+        default: {
+            r = g = b = 0;
+            qDebug("QVNCServer: don't support %dbpp display", screendepth);
+            return;
+        }
+        }
+
+#if Q_BYTE_ORDER == Q_BIG_ENDIAN
+        if (swapBytes ^ isBgr)
+#else
+        if (isBgr)
+#endif
+            qSwap(r, b);
+
+        r >>= (8 - pixelFormat.redBits);
+        g >>= (8 - pixelFormat.greenBits);
+        b >>= (8 - pixelFormat.blueBits);
+
+        int pixel = (r << pixelFormat.redShift) |
+                    (g << pixelFormat.greenShift) |
+                    (b << pixelFormat.blueShift);
+
+        if (sameEndian || pixelFormat.bitsPerPixel == 8) {
+            memcpy(dst, &pixel, bytesPerPixel); // XXX: do a simple for-loop instead?
+            dst += bytesPerPixel;
+            continue;
+        }
+
+
+        if (QSysInfo::ByteOrder == QSysInfo::BigEndian) {
+            switch (pixelFormat.bitsPerPixel) {
+            case 16:
+                pixel = (((pixel & 0x0000ff00) << 8)  |
+                         ((pixel & 0x000000ff) << 24));
+                break;
+            case 32:
+                pixel = (((pixel & 0xff000000) >> 24) |
+                         ((pixel & 0x00ff0000) >> 8)  |
+                         ((pixel & 0x0000ff00) << 8)  |
+                         ((pixel & 0x000000ff) << 24));
+                break;
+            default:
+                qDebug("Cannot handle %d bpp client", pixelFormat.bitsPerPixel);
+            }
+        } else { // QSysInfo::ByteOrder == QSysInfo::LittleEndian
+            switch (pixelFormat.bitsPerPixel) {
+            case 16:
+                pixel = (((pixel & 0xff000000) >> 8) |
+                         ((pixel & 0x00ff0000) << 8));
+                break;
+            case 32:
+                pixel = (((pixel & 0xff000000) >> 24) |
+                         ((pixel & 0x00ff0000) >> 8)  |
+                         ((pixel & 0x0000ff00) << 8)  |
+                         ((pixel & 0x000000ff) << 24));
+                break;
+            default:
+                qDebug("Cannot handle %d bpp client",
+                       pixelFormat.bitsPerPixel);
+                break;
+            }
+        }
+        memcpy(dst, &pixel, bytesPerPixel); // XXX: simple for-loop instead?
+        dst += bytesPerPixel;
+    }
+}
+
+#ifndef QT_NO_QWS_CURSOR
+static void blendCursor(QImage &image, const QRect &imageRect)
+{
+    const QRect cursorRect = qt_screencursor->boundingRect();
+    const QRect intersection = (cursorRect & imageRect);
+    const QRect destRect = intersection.translated(-imageRect.topLeft());
+    const QRect srcRect = intersection.translated(-cursorRect.topLeft());
+
+    QPainter painter(&image);
+    painter.drawImage(destRect, qt_screencursor->image(), srcRect);
+    painter.end();
+}
+#endif // QT_NO_QWS_CURSOR
+
+QVNCDirtyMap::QVNCDirtyMap(QVNCScreen *s)
+    : bytesPerPixel(0), numDirty(0), screen(s)
+{
+    bytesPerPixel = (screen->depth() + 7) / 8;
+    QSize screenSize = screen->geometry().size();
+    bufferWidth = screenSize.width();
+    bufferHeight = screenSize.height();
+    bufferStride = bufferWidth * bytesPerPixel;
+    buffer = new uchar[bufferHeight * bufferStride];
+
+    mapWidth = (bufferWidth + MAP_TILE_SIZE - 1) / MAP_TILE_SIZE;
+    mapHeight = (bufferHeight + MAP_TILE_SIZE - 1) / MAP_TILE_SIZE;
+    numTiles = mapWidth * mapHeight;
+    map = new uchar[numTiles];
+}
+
+QVNCDirtyMap::~QVNCDirtyMap()
+{
+    delete[] map;
+    delete[] buffer;
+}
+
+void QVNCDirtyMap::reset()
+{
+    memset(map, 1, numTiles);
+    memset(buffer, 0, bufferHeight * bufferStride);
+    numDirty = numTiles;
+}
+
+inline bool QVNCDirtyMap::dirty(int x, int y) const
+{
+    return map[y * mapWidth + x];
+}
+
+inline void QVNCDirtyMap::setClean(int x, int y)
+{
+    map[y * mapWidth + x] = 0;
+    --numDirty;
+}
+
+template <class T>
+void QVNCDirtyMapOptimized<T>::setDirty(int tileX, int tileY, bool force)
+{
+    static bool alwaysForce = qgetenv("QT_VNC_NO_COMPAREBUFFER").toInt();
+    if (alwaysForce)
+        force = true;
+
+    bool changed = false;
+
+    if (!force) {
+        const int lstep = screen->linestep();
+        const int startX = tileX * MAP_TILE_SIZE;
+        const int startY = tileY * MAP_TILE_SIZE;
+        const uchar *scrn = screen->base()
+                            + startY * lstep + startX * bytesPerPixel;
+        uchar *old = buffer + startY * bufferStride + startX * sizeof(T);
+
+        const int tileHeight = (startY + MAP_TILE_SIZE > bufferHeight ?
+                                bufferHeight - startY : MAP_TILE_SIZE);
+        const int tileWidth = (startX + MAP_TILE_SIZE > bufferWidth ?
+                               bufferWidth - startX : MAP_TILE_SIZE);
+        const bool doInlines = (tileWidth == MAP_TILE_SIZE);
+
+        int y = tileHeight;
+
+        if (doInlines) { // hw: memcmp/memcpy is inlined when using constants
+            while (y) {
+                if (memcmp(old, scrn, sizeof(T) * MAP_TILE_SIZE)) {
+                    changed = true;
+                    break;
+                }
+                scrn += lstep;
+                old += bufferStride;
+                --y;
+            }
+
+            while (y) {
+                memcpy(old, scrn, sizeof(T) * MAP_TILE_SIZE);
+                scrn += lstep;
+                old += bufferStride;
+                --y;
+            }
+        } else {
+            while (y) {
+                if (memcmp(old, scrn, sizeof(T) * tileWidth)) {
+                    changed = true;
+                    break;
+                }
+                scrn += lstep;
+                old += bufferStride;
+                --y;
+            }
+
+            while (y) {
+                memcpy(old, scrn, sizeof(T) * tileWidth);
+                scrn += lstep;
+                old += bufferStride;
+                --y;
+            }
+        }
+    }
+
+    const int mapIndex = tileY * mapWidth + tileX;
+    if ((force || changed) && !map[mapIndex]) {
+        map[mapIndex] = 1;
+        ++numDirty;
+    }
+}
+
+template <class SRC>
+QRfbHextileEncoder<SRC>::QRfbHextileEncoder(QVNCServer *s)
+    : QRfbEncoder(s),
+      singleColorHextile(this), dualColorHextile(this), multiColorHextile(this)
+{
+}
+
+/*
+    \internal
+    Send dirty rects using hextile encoding.
+*/
+template <class SRC>
+void QRfbHextileEncoder<SRC>::write()
+{
+//    QWSDisplay::grab(true);
+
+    QVNCDirtyMap *map = server->dirtyMap();
+    QTcpSocket *socket = server->clientSocket();
+
+    const quint32 encoding = htonl(5); // hextile encoding
+    const int bytesPerPixel = server->clientBytesPerPixel();
+
+    {
+        const char tmp[2] = { 0, 0 }; // msg type, padding
+        socket->write(tmp, sizeof(tmp));
+    }
+    {
+        const quint16 count = htons(map->numDirty);
+        socket->write((char *)&count, sizeof(count));
+    }
+
+    if (map->numDirty <= 0) {
+//        QWSDisplay::ungrab();
+        return;
+    }
+
+    newBg = true;
+    newFg = true;
+
+    const QImage screenImage = server->screenImage();
+    QRfbRect rect(0, 0, MAP_TILE_SIZE, MAP_TILE_SIZE);
+
+    QSize screenSize = server->screen()->geometry().size();
+
+    for (int y = 0; y < map->mapHeight; ++y) {
+        if (rect.y + MAP_TILE_SIZE > screenSize.height())
+            rect.h = screenSize.height() - rect.y;
+        rect.w = MAP_TILE_SIZE;
+        for (int x = 0; x < map->mapWidth; ++x) {
+            if (!map->dirty(x, y))
+                continue;
+            map->setClean(x, y);
+
+            rect.x = x * MAP_TILE_SIZE;
+            if (rect.x + MAP_TILE_SIZE > screenSize.width()) //###deviceWidth ???
+                rect.w = screenSize.width() - rect.x;
+            rect.write(socket);
+
+            socket->write((char *)&encoding, sizeof(encoding));
+
+            const uchar *screendata = screenImage.scanLine(rect.y)
+                                      + rect.x * screenImage.depth() / 8;
+            int linestep = screenImage.bytesPerLine();
+
+#ifndef QT_NO_QWS_CURSOR
+            // hardware cursors must be blended with the screen memory
+            const bool doBlendCursor = qt_screencursor
+                                       && !server->hasClientCursor()
+                                       && qt_screencursor->isAccelerated();
+            QImage tileImage;
+            if (doBlendCursor) {
+                const QRect tileRect(rect.x, rect.y, rect.w, rect.h);
+                const QRect cursorRect = qt_screencursor->boundingRect()
+                                         .translated(-server->screen()->offset());
+                if (tileRect.intersects(cursorRect)) {
+                    tileImage = screenImage.copy(tileRect);
+                    blendCursor(tileImage,
+                                tileRect.translated(server->screen()->offset()));
+                    screendata = tileImage.bits();
+                    linestep = tileImage.bytesPerLine();
+                }
+            }
+#endif // QT_NO_QWS_CURSOR
+
+            if (singleColorHextile.read(screendata, rect.w, rect.h, linestep)) {
+                singleColorHextile.write(socket);
+            } else if (dualColorHextile.read(screendata, rect.w, rect.h, linestep)) {
+                dualColorHextile.write(socket);
+            } else if (multiColorHextile.read(screendata, rect.w, rect.h, linestep)) {
+                multiColorHextile.write(socket);
+            } else if (server->doPixelConversion()) {
+                const int bufferSize = rect.w * rect.h * bytesPerPixel + 1;
+                const int padding = sizeof(quint32) - sizeof(char);
+                buffer.resize(bufferSize + padding);
+
+                buffer[padding] = 1; // Raw subencoding
+
+                // convert pixels
+                char *b = buffer.data() + padding + 1;
+                const int bstep = rect.w * bytesPerPixel;
+                for (int i = 0; i < rect.h; ++i) {
+                    server->convertPixels(b, (const char*)screendata, rect.w);
+                    screendata += linestep;
+                    b += bstep;
+                }
+                socket->write(buffer.constData() + padding, bufferSize);
+            } else {
+                quint8 subenc = 1; // Raw subencoding
+                socket->write((char *)&subenc, 1);
+
+                // send pixels
+                for (int i = 0; i < rect.h; ++i) {
+                    socket->write((const char*)screendata,
+                                  rect.w * bytesPerPixel);
+                    screendata += linestep;
+                }
+            }
+        }
+        if (socket->state() == QAbstractSocket::UnconnectedState)
+            break;
+        rect.y += MAP_TILE_SIZE;
+    }
+    socket->flush();
+    Q_ASSERT(map->numDirty == 0);
+
+//    QWSDisplay::ungrab();
+}
+
+void QRfbRawEncoder::write()
+{
+//    QWSDisplay::grab(false);
+
+    QVNCDirtyMap *map = server->dirtyMap();
+    QTcpSocket *socket = server->clientSocket();
+
+    const int bytesPerPixel = server->clientBytesPerPixel();
+    QSize screenSize = server->screen()->geometry().size();
+
+    // create a region from the dirty rects and send the region's merged rects.
+    QRegion rgn;
+    if (map) {
+        for (int y = 0; y < map->mapHeight; ++y) {
+            for (int x = 0; x < map->mapWidth; ++x) {
+                if (!map->dirty(x, y))
+                    continue;
+                rgn += QRect(x * MAP_TILE_SIZE, y * MAP_TILE_SIZE,
+                             MAP_TILE_SIZE, MAP_TILE_SIZE);
+                map->setClean(x, y);
+            }
+        }
+
+        rgn &= QRect(0, 0, screenSize.width(),
+                     screenSize.height());
+    }
+    const QVector<QRect> rects = rgn.rects();
+
+    {
+        const char tmp[2] = { 0, 0 }; // msg type, padding
+        socket->write(tmp, sizeof(tmp));
+    }
+
+    {
+        const quint16 count = htons(rects.size());
+        socket->write((char *)&count, sizeof(count));
+    }
+
+    if (rects.size() <= 0) {
+//        QWSDisplay::ungrab();
+        return;
+    }
+
+    const QImage *screenImage = server->screenImage();
+
+    for (int i = 0; i < rects.size(); ++i) {
+        const QRect tileRect = rects.at(i);
+        const QRfbRect rect(tileRect.x(), tileRect.y(),
+                            tileRect.width(), tileRect.height());
+        rect.write(socket);
+
+        const quint32 encoding = htonl(0); // raw encoding
+        socket->write((char *)&encoding, sizeof(encoding));
+
+        int linestep = screenImage->bytesPerLine();
+        const uchar *screendata = screenImage->scanLine(rect.y)
+                                  + rect.x * screenImage->depth() / 8;
+
+#ifndef QT_NO_QWS_CURSOR
+        // hardware cursors must be blended with the screen memory
+        const bool doBlendCursor = qt_screencursor
+                                   && !server->hasClientCursor()
+                                   && qt_screencursor->isAccelerated();
+        QImage tileImage;
+        if (doBlendCursor) {
+            const QRect cursorRect = qt_screencursor->boundingRect()
+                                     .translated(-server->screen()->offset());
+            if (tileRect.intersects(cursorRect)) {
+                tileImage = screenImage->copy(tileRect);
+                blendCursor(tileImage,
+                            tileRect.translated(server->screen()->offset()));
+                screendata = tileImage.bits();
+                linestep = tileImage.bytesPerLine();
+            }
+        }
+#endif // QT_NO_QWS_CURSOR
+
+        if (server->doPixelConversion()) {
+            const int bufferSize = rect.w * rect.h * bytesPerPixel;
+            if (bufferSize > buffer.size())
+                buffer.resize(bufferSize);
+
+            // convert pixels
+            char *b = buffer.data();
+            const int bstep = rect.w * bytesPerPixel;
+            for (int i = 0; i < rect.h; ++i) {
+                server->convertPixels(b, (const char*)screendata, rect.w);
+                screendata += linestep;
+                b += bstep;
+            }
+            socket->write(buffer.constData(), bufferSize);
+        } else {
+            for (int i = 0; i < rect.h; ++i) {
+                socket->write((const char*)screendata, rect.w * bytesPerPixel);
+                screendata += linestep;
+            }
+        }
+        if (socket->state() == QAbstractSocket::UnconnectedState)
+            break;
+    }
+    socket->flush();
+
+//    QWSDisplay::ungrab();
+}
+
+inline QImage *QVNCServer::screenImage() const
+{
+    return qvnc_screen->image();
+}
+
+void QVNCServer::checkUpdate()
+{
+    if (!wantUpdate)
+        return;
+
+    if (dirtyCursor) {
+#ifndef QT_NO_QWS_CURSOR
+        Q_ASSERT(qvnc_cursor);
+        qvnc_cursor->write();
+#endif
+        cursor->sendClientCursor();
+        dirtyCursor = false;
+        wantUpdate = false;
+        return;
+    }
+
+    if (dirtyMap()->numDirty > 0) {
+        if (encoder)
+            encoder->write();
+        wantUpdate = false;
+    }
+}
+
+void QVNCServer::discardClient()
+{
+    timer->stop();
+    state = Unconnected;
+    delete encoder;
+    encoder = 0;
+#ifndef QT_NO_QWS_CURSOR
+    delete qvnc_cursor;
+    qvnc_cursor = 0;
+#endif
+//     if (!qvnc_screen->screen())
+//         QWSServer::instance()->enablePainting(false);
+}
+
+
+
+QVNCScreenPrivate::QVNCScreenPrivate(QVNCScreen *parent, int screenId)
+    : dpiX(72), dpiY(72), doOnScreenSurface(false), refreshRate(25),
+      vncServer(0), q_ptr(parent)
+{
+#if 0//ndef QT_NO_QWS_SIGNALHANDLER
+    QWSSignalHandler::instance()->addObject(this);
+#endif
+
+    vncServer = new QVNCServer(q_ptr, screenId);
+    vncServer->setRefreshRate(refreshRate);
+
+
+    Q_ASSERT(q_ptr->depth() == 32);
+
+    dirty = new QVNCDirtyMapOptimized<quint32>(q_ptr);
+}
+
+QVNCScreenPrivate::~QVNCScreenPrivate()
+{
+}
+
+
+void QVNCScreenPrivate::setDirty(const QRect& rect, bool force)
+{
+    if (rect.isEmpty())
+        return;
+
+//     if (q_ptr->screen())
+//         q_ptr->screen()->setDirty(rect);
+
+    if (!vncServer || !vncServer->isConnected()) {
+//        qDebug() << "QVNCScreenPrivate::setDirty() - Not connected";
+        return;
+    }
+    const QRect r = rect; // .translated(-q_ptr->offset());
+    const int x1 = r.x() / MAP_TILE_SIZE;
+    int y = r.y() / MAP_TILE_SIZE;
+    for (; (y <= r.bottom() / MAP_TILE_SIZE) && y < dirty->mapHeight; y++)
+        for (int x = x1; (x <= r.right() / MAP_TILE_SIZE) && x < dirty->mapWidth; x++)
+            dirty->setDirty(x, y, force);
+
+    vncServer->setDirty();
+}
+
+
+
+
+QT_END_NAMESPACE