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#include "qvfbmmap.h"

#include "qvfbhdr.h"

#include <QTimer>

#include <stdlib.h>

#include <unistd.h>

#include <sys/ipc.h>

#include <sys/types.h>

#include <sys/shm.h>

#include <sys/stat.h>

#include <sys/sem.h>

#include <sys/mman.h>

#include <fcntl.h>

#include <errno.h>

#include <math.h>

QT_BEGIN_NAMESPACE

QMMapViewProtocol::QMMapViewProtocol(int displayid, const QSize &s,

                                     int d, QObject *parent)

    : QVFbViewProtocol(displayid, parent), hdr(0), dataCache(0), windowId(0)

{

    switch (d) {

    case 1:

    case 4:

    case 8:

    case 12:

    case 15:

    case 16:

    case 18:

    case 24:

    case 32:

        break;

    default:

        qFatal("Unsupported bit depth %d\n", d);

    }

    fileName = QString("/tmp/.qtvfb_map-%1").arg(displayid);

    int w = s.width();

    int h = s.height();

    kh = new QVFbKeyPipeProtocol(displayid);

    mh = new QVFbMouseLinuxTP(displayid);

    int bpl;

    if (d < 8)

	bpl = (w * d + 7) / 8;

    else

        bpl = w * ((d + 7) / 8);

    displaySize = bpl * h;

    unsigned char *data;

    uint data_offset_value = sizeof(QVFbHeader);

    const int page_size = getpagesize();

    if (data_offset_value % page_size)

        data_offset_value += page_size - (data_offset_value % page_size);

    dataSize = bpl * h + data_offset_value;

    unlink(fileName.toLocal8Bit().data());

    fd = ::open( fileName.toLocal8Bit().data(), O_CREAT|O_RDWR, 0666 );

    ::lseek(fd, dataSize, SEEK_SET);

    ::write(fd, "\0", 1);

    if (fd < 0) {

        data = (unsigned char *)-1;

    } else {

        // might need to do something about size?

        data = (unsigned char *)mmap(NULL, dataSize, PROT_WRITE | PROT_READ,

                                     MAP_SHARED, fd, 0);

        if (data == MAP_FAILED)

            data = (unsigned char *)-1;

    }

    if ( (long)data == -1 ){

        delete kh;

        delete mh;

	qFatal( "Cannot attach to mapped file %s", fileName.toLocal8Bit().data());

    }

    dataCache = (unsigned char *)malloc(displaySize);

    memset(dataCache, 0, displaySize);

    memset(data+sizeof(QVFbHeader), 0, displaySize);

    hdr = (QVFbHeader *)data;

    hdr->width = w;

    hdr->height = h;

    hdr->depth = d;

    hdr->linestep = bpl;

    hdr->numcols = 0;

    hdr->dataoffset = data_offset_value;

    hdr->update = QRect();

    hdr->brightness = 255;

    hdr->windowId = 0;

    mRefreshTimer = new QTimer(this);

    connect(mRefreshTimer, SIGNAL(timeout()), this, SLOT(flushChanges()));

}

QMMapViewProtocol::~QMMapViewProtocol()

{

    munmap((char *)hdr, dataSize);

    ::close(fd);

    unlink(fileName.toLocal8Bit().constData());

    free(dataCache);

    delete kh;

    delete mh;

}

int QMMapViewProtocol::brightness() const

{

    return hdr->brightness;

}

int QMMapViewProtocol::width() const

{

    return hdr->width;

}

int QMMapViewProtocol::height() const

{

    return hdr->height;

}

int QMMapViewProtocol::depth() const

{

    return hdr->depth;

}

int QMMapViewProtocol::linestep() const

{

    return hdr->linestep;

}

int  QMMapViewProtocol::numcols() const

{

    return hdr->numcols;

}

QVector<QRgb> QMMapViewProtocol::clut() const

{

    QVector<QRgb> vector(hdr->numcols);

    for (int i=0; i < hdr->numcols; ++i)

        vector[i] = hdr->clut[i];

    return vector;

}

unsigned char *QMMapViewProtocol::data() const

{

    return dataCache;

    //return ((unsigned char *)hdr)+hdr->dataoffset;

}

void QMMapViewProtocol::flushChanges()

{

    // based of dirty rect, copy changes from hdr to hdrcopy

    memcpy(dataCache, ((char *)hdr) + hdr->dataoffset, displaySize);

    emit displayDataChanged(QRect(0, 0, width(), height()));

}

void QMMapViewProtocol::setRate(int interval)

{

    if (interval > 0)

        return mRefreshTimer->start(1000/interval);

    else

        mRefreshTimer->stop();

}

int QMMapViewProtocol::rate() const

{

    int i = mRefreshTimer->interval();

    if (i > 0)

        return 1000/i;

    else

        return 0;

}

QT_END_NAMESPACE