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#include "qsvgiohandler.h"

#ifndef QT_NO_SVGRENDERER

#include "qsvgrenderer.h"

#include "qimage.h"

#include "qpixmap.h"

#include "qpainter.h"

#include "qvariant.h"

#include "qdebug.h"

QT_BEGIN_NAMESPACE

class QSvgIOHandlerPrivate

{

public:

    QSvgIOHandlerPrivate()

        : r(new QSvgRenderer()), loaded(false)

    {}

    ~QSvgIOHandlerPrivate()

    {

        delete r;

    }

    bool load(QIODevice *device);

    static bool findSvgTag(QIODevice *device);

    QSvgRenderer *r;

    QSize         defaultSize;

    QSize         currentSize;

    bool          loaded;

};

bool QSvgIOHandlerPrivate::load(QIODevice *device)

{

    if (loaded)

        return true;

    if (r->load(device->readAll())) {

        defaultSize = QSize(r->viewBox().width(), r->viewBox().height());

        if (currentSize.isEmpty())

            currentSize = defaultSize;

    }

    loaded = r->isValid();

    return loaded;

}

bool QSvgIOHandlerPrivate::findSvgTag(QIODevice *device)

{

    qint64 pos = device->pos();

    device->seek(0);

    char buffer[256];

    const char svg_tag[] = "<svg";

    while (1) {

        int size = device->read(buffer, 256);

        for (int i=0; i<size - 5; ++i) {

            if (!memcmp(buffer + i, svg_tag, 4)) {

                if (buffer[i+4] == ' ' || buffer[i+4] == '\t'

                    || buffer[i+4] == '\n' || buffer[i+4] == '\r')

                {

                    device->seek(pos);

                    return true;

                }

            }

        }

        if (device->atEnd())

            break;

        device->seek(device->pos()-4);

    }

    device->seek(pos);

    return false;

}

QSvgIOHandler::QSvgIOHandler()

    : d(new QSvgIOHandlerPrivate())

{

}

QSvgIOHandler::~QSvgIOHandler()

{

    delete d;

}

bool QSvgIOHandler::canRead() const

{

    return QSvgIOHandlerPrivate::findSvgTag(device());

}

QByteArray QSvgIOHandler::name() const

{

    return "svg";

}

bool QSvgIOHandler::read(QImage *image)

{

    if (d->load(device())) {

        *image = QImage(d->currentSize, QImage::Format_ARGB32_Premultiplied);

        if (!d->currentSize.isEmpty()) {

            image->fill(0x00000000);

            QPainter p(image);

            d->r->render(&p);

            p.end();

        }

        return true;

    }

    return false;

}

QVariant QSvgIOHandler::option(ImageOption option) const

{

    switch(option) {

    case ImageFormat:

        return QImage::Format_ARGB32_Premultiplied;

        break;

    case Size:

        d->load(device());

        return d->defaultSize;

        break;

    case ScaledSize:

        return d->currentSize;

        break;

    default:

        break;

    }

    return QVariant();

}

void QSvgIOHandler::setOption(ImageOption option, const QVariant & value)

{

    switch(option) {

    case Size:

        d->defaultSize = value.toSize();

        d->currentSize = value.toSize();

        break;

    case ScaledSize:

        d->currentSize = value.toSize();

        break;

    default:

        break;

    }

}

bool QSvgIOHandler::supportsOption(ImageOption option) const

{

    switch(option)

    {

    case ImageFormat:

    case Size:

    case ScaledSize:

        return true;

    default:

        break;

    }

    return false;

}

bool QSvgIOHandler::canRead(QIODevice *device)

{

    return QSvgIOHandlerPrivate::findSvgTag(device);

}

QT_END_NAMESPACE

#endif // QT_NO_SVGRENDERER