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#include "qsvgiconengine.h"

#ifndef QT_NO_SVGRENDERER

#include "qpainter.h"

#include "qpixmap.h"

#include "qsvgrenderer.h"

#include "qpixmapcache.h"

#include "qstyle.h"

#include "qapplication.h"

#include "qstyleoption.h"

#include "qfileinfo.h"

#include <QAtomicInt>

#include "qdebug.h"

QT_BEGIN_NAMESPACE

class QSvgIconEnginePrivate : public QSharedData

{

public:

    QSvgIconEnginePrivate()

        : svgBuffers(0), addedPixmaps(0)

        { stepSerialNum(); }

    ~QSvgIconEnginePrivate()

        { delete addedPixmaps; delete svgBuffers; }

    static int hashKey(QIcon::Mode mode, QIcon::State state)

        { return (((mode)<<4)|state); }

    QString pmcKey(const QSize &size, QIcon::Mode mode, QIcon::State state)

        { return QLatin1String("$qt_svgicon_")

                 + QString::number(serialNum, 16).append(QLatin1Char('_'))

                 + QString::number((((((size.width()<<11)|size.height())<<11)|mode)<<4)|state, 16); }

    void stepSerialNum()

        { serialNum = lastSerialNum.fetchAndAddRelaxed(1); }

    void loadDataForModeAndState(QSvgRenderer *renderer, QIcon::Mode mode, QIcon::State state);

    QHash<int, QString> svgFiles;

    QHash<int, QByteArray> *svgBuffers;

    QHash<int, QPixmap> *addedPixmaps;

    int serialNum;

    static QAtomicInt lastSerialNum;

};

QAtomicInt QSvgIconEnginePrivate::lastSerialNum;

static inline int pmKey(const QSize &size, QIcon::Mode mode, QIcon::State state)

{

    return ((((((size.width()<<11)|size.height())<<11)|mode)<<4)|state);

}

QSvgIconEngine::QSvgIconEngine()

    : d(new QSvgIconEnginePrivate)

{

}

QSvgIconEngine::QSvgIconEngine(const QSvgIconEngine &other)

    : QIconEngineV2(other), d(new QSvgIconEnginePrivate)

{

    d->svgFiles = other.d->svgFiles;

    if (other.d->svgBuffers)

        d->svgBuffers = new QHash<int, QByteArray>(*other.d->svgBuffers);

    if (other.d->addedPixmaps)

        d->addedPixmaps = new QHash<int, QPixmap>(*other.d->addedPixmaps);

}

QSvgIconEngine::~QSvgIconEngine()

{

}

QSize QSvgIconEngine::actualSize(const QSize &size, QIcon::Mode mode,

                                 QIcon::State state)

{

    if (d->addedPixmaps) {

        QPixmap pm = d->addedPixmaps->value(d->hashKey(mode, state));

        if (!pm.isNull() && pm.size() == size)

            return size;

    }

    QPixmap pm = pixmap(size, mode, state);

    if (pm.isNull())

        return QSize();

    return pm.size();

}

void QSvgIconEnginePrivate::loadDataForModeAndState(QSvgRenderer *renderer, QIcon::Mode mode, QIcon::State state)

{

    QByteArray buf;

    if (svgBuffers) {

        buf = svgBuffers->value(hashKey(mode, state));

        if (buf.isEmpty())

            buf = svgBuffers->value(hashKey(QIcon::Normal, QIcon::Off));

    }

    if (!buf.isEmpty()) {

#ifndef QT_NO_COMPRESS

        buf = qUncompress(buf);

#endif

        renderer->load(buf);

    } else {

        QString svgFile = svgFiles.value(hashKey(mode, state));

        if (svgFile.isEmpty())

            svgFile = svgFiles.value(hashKey(QIcon::Normal, QIcon::Off));

        if (!svgFile.isEmpty())

            renderer->load(svgFile);

    }

}

QPixmap QSvgIconEngine::pixmap(const QSize &size, QIcon::Mode mode,

                               QIcon::State state)

{

    QPixmap pm;

    QString pmckey(d->pmcKey(size, mode, state));

    if (QPixmapCache::find(pmckey, pm))

        return pm;

    if (d->addedPixmaps) {

        pm = d->addedPixmaps->value(d->hashKey(mode, state));

        if (!pm.isNull() && pm.size() == size)

            return pm;

    }

    QSvgRenderer renderer;

    d->loadDataForModeAndState(&renderer, mode, state);

    if (!renderer.isValid())

        return pm;

    QSize actualSize = renderer.defaultSize();

    if (!actualSize.isNull())

        actualSize.scale(size, Qt::KeepAspectRatio);

    QImage img(actualSize, QImage::Format_ARGB32_Premultiplied);

    img.fill(0x00000000);

    QPainter p(&img);

    renderer.render(&p);

    p.end();

    pm = QPixmap::fromImage(img);

    QStyleOption opt(0);

    opt.palette = QApplication::palette();

    QPixmap generated = QApplication::style()->generatedIconPixmap(mode, pm, &opt);

    if (!generated.isNull())

        pm = generated;

    if (!pm.isNull())

        QPixmapCache::insert(pmckey, pm);

    return pm;

}

void QSvgIconEngine::addPixmap(const QPixmap &pixmap, QIcon::Mode mode,

                               QIcon::State state)

{

    if (!d->addedPixmaps)

        d->addedPixmaps = new QHash<int, QPixmap>;

    d->stepSerialNum();

    d->addedPixmaps->insert(d->hashKey(mode, state), pixmap);

}

void QSvgIconEngine::addFile(const QString &fileName, const QSize &,

                             QIcon::Mode mode, QIcon::State state)

{

    if (!fileName.isEmpty()) {

        QString abs = fileName;

        if (fileName.at(0) != QLatin1Char(':'))

            abs = QFileInfo(fileName).absoluteFilePath();

        if (abs.endsWith(QLatin1String(".svg"), Qt::CaseInsensitive)

#ifndef QT_NO_COMPRESS

                || abs.endsWith(QLatin1String(".svgz"), Qt::CaseInsensitive)

                || abs.endsWith(QLatin1String(".svg.gz"), Qt::CaseInsensitive))

#endif

        {

            QSvgRenderer renderer(abs);

            if (renderer.isValid()) {

                d->stepSerialNum();

                d->svgFiles.insert(d->hashKey(mode, state), abs);

            }

        } else {

            QPixmap pm(abs);

            if (!pm.isNull())

                addPixmap(pm, mode, state);

        }

    }

}

void QSvgIconEngine::paint(QPainter *painter, const QRect &rect,

                           QIcon::Mode mode, QIcon::State state)

{

    painter->drawPixmap(rect, pixmap(rect.size(), mode, state));

}

QString QSvgIconEngine::key() const

{

    return QLatin1String("svg");

}

QIconEngineV2 *QSvgIconEngine::clone() const

{

    return new QSvgIconEngine(*this);

}

bool QSvgIconEngine::read(QDataStream &in)

{

    d = new QSvgIconEnginePrivate;

    d->svgBuffers = new QHash<int, QByteArray>;

    if (in.version() >= QDataStream::Qt_4_4) {

        int isCompressed;

        QHash<int, QString> fileNames;  // For memoryoptimization later

        in >> fileNames >> isCompressed >> *d->svgBuffers;

#ifndef QT_NO_COMPRESS

        if (!isCompressed) {

            foreach(int key, d->svgBuffers->keys())

                d->svgBuffers->insert(key, qCompress(d->svgBuffers->value(key)));

        }

#else

        if (isCompressed) {

            qWarning("QSvgIconEngine: Can not decompress SVG data");

            d->svgBuffers->clear();

        }

#endif

        int hasAddedPixmaps;

        in >> hasAddedPixmaps;

        if (hasAddedPixmaps) {

            d->addedPixmaps = new QHash<int, QPixmap>;

            in >> *d->addedPixmaps;

        }

    }

    else {

        QPixmap pixmap;

        QByteArray data;

        uint mode;

        uint state;

        int num_entries;

        in >> data;

        if (!data.isEmpty()) {

#ifndef QT_NO_COMPRESS

            data = qUncompress(data);

#endif

            if (!data.isEmpty())

                d->svgBuffers->insert(d->hashKey(QIcon::Normal, QIcon::Off), data);

        }

        in >> num_entries;

        for (int i=0; i<num_entries; ++i) {

            if (in.atEnd())

                return false;

            in >> pixmap;

            in >> mode;

            in >> state;

            // The pm list written by 4.3 is buggy and/or useless, so ignore.

            //addPixmap(pixmap, QIcon::Mode(mode), QIcon::State(state));

        }

    }

    return true;

}

bool QSvgIconEngine::write(QDataStream &out) const

{

    if (out.version() >= QDataStream::Qt_4_4) {

        int isCompressed = 0;

#ifndef QT_NO_COMPRESS

        isCompressed = 1;

#endif

        QHash<int, QByteArray> svgBuffers;

        if (d->svgBuffers)

            svgBuffers = *d->svgBuffers;

        foreach(int key, d->svgFiles.keys()) {

            QByteArray buf;

            QFile f(d->svgFiles.value(key));

            if (f.open(QIODevice::ReadOnly))

                buf = f.readAll();

#ifndef QT_NO_COMPRESS

            buf = qCompress(buf);

#endif

            svgBuffers.insert(key, buf);

        }

        out << d->svgFiles << isCompressed << svgBuffers;

        if (d->addedPixmaps)

            out << (int)1 << *d->addedPixmaps;

        else

            out << (int)0;

    }

    else {

        QByteArray buf;

        if (d->svgBuffers)

            buf = d->svgBuffers->value(d->hashKey(QIcon::Normal, QIcon::Off));

        if (buf.isEmpty()) {

            QString svgFile = d->svgFiles.value(d->hashKey(QIcon::Normal, QIcon::Off));

            if (!svgFile.isEmpty()) {

                QFile f(svgFile);

                if (f.open(QIODevice::ReadOnly))

                    buf = f.readAll();

            }

        }

#ifndef QT_NO_COMPRESS

        buf = qCompress(buf);

#endif

        out << buf;

        // 4.3 has buggy handling of added pixmaps, so don't write any

        out << (int)0;

    }

    return true;

}

QT_END_NAMESPACE

#endif // QT_NO_SVGRENDERER