/****************************************************************************+
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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 applications 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 "qlock_p.h"+
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+
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#include "qvfbshmem.h"+
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#include "qvfbhdr.h"+
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+
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#include <QFile>+
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#include <QTimer>+
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+
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#include <stdlib.h>+
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#include <unistd.h>+
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#include <sys/ipc.h>+
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#include <sys/types.h>+
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#include <sys/shm.h>+
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#include <sys/stat.h>+
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#include <sys/sem.h>+
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#include <sys/mman.h>+
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#include <fcntl.h>+
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#include <errno.h>+
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#include <math.h>+
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+
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QT_BEGIN_NAMESPACE+
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+
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#ifdef Q_WS_QWS+
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#error qvfb must be compiled with  the Qt for X11 package+
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#endif+
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+
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// Get the name of the directory where Qt for Embedded Linux temporary data should+
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// live.+
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static QString qws_dataDir(int qws_display_id)+
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{+
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    QByteArray dataDir = QT_VFB_DATADIR(qws_display_id).toLocal8Bit();+
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    if (mkdir(dataDir, 0700)) {+
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        if (errno != EEXIST) {+
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            qFatal("Cannot create Qt for Embedded Linux data directory: %s", dataDir.constData());+
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        }+
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    }+
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+
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    struct stat buf;+
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    if (lstat(dataDir, &buf))+
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        qFatal("stat failed for Qt for Embedded Linux data directory: %s", dataDir.constData());+
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+
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    if (!S_ISDIR(buf.st_mode))+
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        qFatal("%s is not a directory", dataDir.constData());+
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    if (buf.st_uid != getuid())+
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        qFatal("Qt for Embedded Linux data directory is not owned by user %uh", getuid());+
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+
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    if ((buf.st_mode & 0677) != 0600)+
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        qFatal("Qt for Embedded Linux data directory has incorrect permissions: %s", dataDir.constData());+
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    dataDir += "/";+
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+
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    return QString(dataDir);+
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}+
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+
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+
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static QString displayPipe;+
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static QString displayPiped;+
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class DisplayLock+
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{+
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public:+
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    DisplayLock() : qlock(0) {+
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        if (QFile::exists(displayPiped)) {+
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            qlock = new QLock(displayPipe, 'd', false);+
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            qlock->lock(QLock::Read);+
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        }+
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    }+
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    ~DisplayLock() {+
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        if (qlock) {+
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            qlock->unlock();+
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            delete qlock;+
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            qlock = 0;+
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        }+
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    }+
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private:+
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    QLock *qlock;+
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};+
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+
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QShMemViewProtocol::QShMemViewProtocol(int displayid, const QSize &s,+
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                                       int d, QObject *parent)+
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    : QVFbViewProtocol(displayid, parent), hdr(0), dataCache(0), lockId(-1),+
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      windowId(0)+
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{+
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    int w = s.width();+
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    int h = s.height();+
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+
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    QString username = "unknown";+
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    const char *logname = getenv("LOGNAME");+
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    if ( logname )+
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        username = logname;+
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+
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    qws_dataDir(displayid);+
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+
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    QString oldPipe = "/tmp/qtembedded-" + username + "/" + QString("QtEmbedded-%1").arg(displayid);+
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    int oldPipeSemkey = ftok(oldPipe.toLatin1().constData(), 'd');+
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    if (oldPipeSemkey != -1) {+
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        int oldPipeLockId = semget(oldPipeSemkey, 0, 0);+
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        if (oldPipeLockId >= 0){+
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            sembuf sops;+
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            sops.sem_num = 0;+
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            sops.sem_op = 1;+
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            sops.sem_flg = SEM_UNDO;+
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            int rv;+
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            do {+
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                rv = semop(lockId,&sops,1);+
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            } while (rv == -1 && errno == EINTR);+
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+
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            perror("QShMemViewProtocol::QShMemViewProtocol");+
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            qFatal("Cannot create lock file as an old version of QVFb has "+
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                   "opened %s. Close other QVFb and try again",+
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                   oldPipe.toLatin1().constData());+
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        }+
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    }+
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+
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    displayPipe = QTE_PIPE_QVFB(displayid);+
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+
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    kh = new QVFbKeyPipeProtocol(displayid);+
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    /* should really depend on receiving qt version, but how can+
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       one tell? */+
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    mh = new QVFbMousePipe(displayid);+
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+
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    QString mousePipe = mh->pipeName();+
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+
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    key_t key = ftok(mousePipe.toLatin1().constData(), 'b');+
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+
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    int bpl;+
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    if (d < 8)+
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	bpl = (w * d + 7) / 8;+
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    else+
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        bpl = w * ((d + 7) / 8);+
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+
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    displaySize = bpl * h;+
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+
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    unsigned char *data;+
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    uint data_offset_value = sizeof(QVFbHeader);+
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+
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    int dataSize = bpl * h + data_offset_value;+
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    shmId = shmget(key, dataSize, IPC_CREAT | 0666);+
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    if (shmId != -1)+
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	data = (unsigned char *)shmat(shmId, 0, 0);+
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    else {+
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	struct shmid_ds shm;+
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	shmctl(shmId, IPC_RMID, &shm);+
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	shmId = shmget(key, dataSize, IPC_CREAT | 0666);+
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	if (shmId == -1) {+
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            perror("QShMemViewProtocol::QShMemViewProtocol");+
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            qFatal("Cannot get shared memory 0x%08x", key);+
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        }+
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	data = (unsigned char *)shmat(shmId, 0, 0);+
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    }+
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+
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    if ((long)data == -1) {+
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        delete kh;+
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        delete mh;+
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        perror("QShMemViewProtocol::QShMemViewProtocol");+
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        qFatal("Cannot attach to shared memory %d",shmId);+
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    }+
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    dataCache = (unsigned char *)malloc(displaySize);+
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    memset(dataCache, 0, displaySize);+
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    memset(data+sizeof(QVFbHeader), 0, displaySize);+
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+
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    hdr = (QVFbHeader *)data;+
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    hdr->width = w;+
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    hdr->height = h;+
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    hdr->depth = d;+
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    hdr->linestep = bpl;+
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    hdr->dataoffset = data_offset_value;+
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    hdr->update = QRect();+
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    hdr->dirty = 0;+
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    hdr->numcols = 0;+
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    hdr->viewerVersion = QT_VERSION;+
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    hdr->brightness = 255;+
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    hdr->windowId = 0;+
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+
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    displayPiped = displayPipe + 'd';+
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+
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+
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    mRefreshTimer = new QTimer(this);+
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    connect(mRefreshTimer, SIGNAL(timeout()), this, SLOT(flushChanges()));+
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}+
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+
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QShMemViewProtocol::~QShMemViewProtocol()+
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{+
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    struct shmid_ds shm;+
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    shmdt( (char*)hdr );+
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    shmctl( shmId, IPC_RMID, &shm );+
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    free(dataCache);+
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    delete kh;+
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    delete mh;+
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}+
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+
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int QShMemViewProtocol::width() const+
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{+
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    return hdr->width;+
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}+
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+
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int QShMemViewProtocol::height() const+
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{+
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    return hdr->height;+
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}+
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+
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int QShMemViewProtocol::depth() const+
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{+
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    return hdr->depth;+
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}+
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+
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int QShMemViewProtocol::linestep() const+
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{+
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    return hdr->linestep;+
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}+
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+
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int  QShMemViewProtocol::numcols() const+
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{+
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    return hdr->numcols;+
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}+
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+
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QVector<QRgb> QShMemViewProtocol::clut() const+
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{+
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    QVector<QRgb> vector(hdr->numcols);+
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    for (int i=0; i < hdr->numcols; ++i)+
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        vector[i]=hdr->clut[i];+
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+
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    return vector;+
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}+
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+
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unsigned char *QShMemViewProtocol::data() const+
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{+
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    return dataCache;+
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    //return ((unsigned char *)hdr)+hdr->dataoffset;+
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}+
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+
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int QShMemViewProtocol::brightness() const+
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{+
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    return hdr->brightness;+
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}+
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+
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void QShMemViewProtocol::flushChanges()+
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{+
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    QRect r;+
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    if (hdr->dirty) {+
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        DisplayLock();+
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+
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        hdr->dirty = false;+
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        r = hdr->update;+
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        hdr->update = QRect();+
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+
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        if (hdr->windowId != windowId) {+
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            windowId = hdr->windowId;+
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            emit displayEmbedRequested(hdr->windowId);+
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        } else if (!hdr->windowId) {+
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            // copy the memory area, for now, be inefficient.+
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            memcpy(dataCache, ((char *)hdr) + hdr->dataoffset, displaySize);+
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        }+
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    }+
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    emit displayDataChanged(r);+
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}+
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+
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void QShMemViewProtocol::setRate(int interval)+
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{+
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    if (interval > 0)+
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        return mRefreshTimer->start(1000/interval);+
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    else+
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        mRefreshTimer->stop();+
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}+
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+
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int QShMemViewProtocol::rate() const+
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{+
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    int i = mRefreshTimer->interval();+
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    if (i > 0)+
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        return 1000/i;+
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    else+
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        return 0;+
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}+
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+
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QT_END_NAMESPACE+
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