/****************************************************************************

**

** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).

** All rights reserved.

** Contact: Nokia Corporation (qt-info@nokia.com)

**

** This file is part of the QtSvg module 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.

**

**

**

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**

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** $QT_END_LICENSE$

**

****************************************************************************/

#include "qsvgtinydocument_p.h"

#ifndef QT_NO_SVG

#include "qsvghandler_p.h"

#include "qsvgfont_p.h"

#include "qpainter.h"

#include "qfile.h"

#include "qbuffer.h"

#include "qbytearray.h"

#include "qqueue.h"

#include "qstack.h"

#include "qdebug.h"

#ifndef QT_NO_COMPRESS

#include <zlib.h>

#endif

QT_BEGIN_NAMESPACE

QSvgTinyDocument::QSvgTinyDocument()

    : QSvgStructureNode(0)

    , m_widthPercent(false)

    , m_heightPercent(false)

    , m_animated(false)

    , m_animationDuration(0)

    , m_fps(30)

{

}

QSvgTinyDocument::~QSvgTinyDocument()

{

}

#ifndef QT_NO_COMPRESS

#   ifdef QT_BUILD_INTERNAL

Q_AUTOTEST_EXPORT QByteArray qt_inflateGZipDataFrom(QIODevice *device);

#   else

static QByteArray qt_inflateGZipDataFrom(QIODevice *device);

#   endif

QByteArray qt_inflateGZipDataFrom(QIODevice *device)

{

    if (!device)

        return QByteArray();

    if (!device->isOpen())

        device->open(QIODevice::ReadOnly);

    Q_ASSERT(device->isOpen() && device->isReadable());

    static const int CHUNK_SIZE = 4096;

    int zlibResult = Z_OK;

    QByteArray source;

    QByteArray destination;

    // Initialize zlib stream struct

    z_stream zlibStream;

    zlibStream.next_in = Z_NULL;

    zlibStream.avail_in = 0;

    zlibStream.avail_out = 0;

    zlibStream.zalloc = Z_NULL;

    zlibStream.zfree = Z_NULL;

    zlibStream.opaque = Z_NULL;

    // Adding 16 to the window size gives us gzip decoding

    if (inflateInit2(&zlibStream, MAX_WBITS + 16) != Z_OK) {

        qWarning("Cannot initialize zlib, because: %s",

                (zlibStream.msg != NULL ? zlibStream.msg : "Unknown error"));

        return QByteArray();

    }

    bool stillMoreWorkToDo = true;

    while (stillMoreWorkToDo) {

        if (!zlibStream.avail_in) {

            source = device->read(CHUNK_SIZE);

            if (source.isEmpty())

                break;

            zlibStream.avail_in = source.size();

            zlibStream.next_in = reinterpret_cast<Bytef*>(source.data());

        }

        do {

            // Prepare the destination buffer

            int oldSize = destination.size();

            destination.resize(oldSize + CHUNK_SIZE);

            zlibStream.next_out = reinterpret_cast<Bytef*>(

                    destination.data() + oldSize - zlibStream.avail_out);

            zlibStream.avail_out += CHUNK_SIZE;

            zlibResult = inflate(&zlibStream, Z_NO_FLUSH);

            switch (zlibResult) {

                case Z_NEED_DICT:

                case Z_DATA_ERROR:

                case Z_STREAM_ERROR:

                case Z_MEM_ERROR: {

                    inflateEnd(&zlibStream);

                    qWarning("Error while inflating gzip file: %s",

                            (zlibStream.msg != NULL ? zlibStream.msg : "Unknown error"));

                    destination.chop(zlibStream.avail_out);

                    return destination;

                }

            }

        // If the output buffer still has more room after calling inflate

        // it means we have to provide more data, so exit the loop here

        } while (!zlibStream.avail_out);

        if (zlibResult == Z_STREAM_END) {

            // Make sure there are no more members to process before exiting

            if (!(zlibStream.avail_in && inflateReset(&zlibStream) == Z_OK))

                stillMoreWorkToDo = false;

        }

    }

    // Chop off trailing space in the buffer

    destination.chop(zlibStream.avail_out);

    inflateEnd(&zlibStream);

    return destination;

}

#endif

QSvgTinyDocument * QSvgTinyDocument::load(const QString &fileName)

{

    QFile file(fileName);

    if (!file.open(QFile::ReadOnly)) {

        qWarning("Cannot open file '%s', because: %s",

                 qPrintable(fileName), qPrintable(file.errorString()));

        return 0;

    }

#ifndef QT_NO_COMPRESS

    if (fileName.endsWith(QLatin1String(".svgz"), Qt::CaseInsensitive)

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

        return load(qt_inflateGZipDataFrom(&file));

    }

#endif

    QSvgTinyDocument *doc = 0;

    QSvgHandler handler(&file);

    if (handler.ok()) {

        doc = handler.document();

        doc->m_animationDuration = handler.animationDuration();

    } else {

        qWarning("Cannot read file '%s', because: %s (line %d)",

                 qPrintable(fileName), qPrintable(handler.errorString()), handler.lineNumber());

    }

    return doc;

}

QSvgTinyDocument * QSvgTinyDocument::load(const QByteArray &contents)

{

#ifndef QT_NO_COMPRESS

    // Check for gzip magic number and inflate if appropriate

    if (contents.startsWith("\x1f\x8b")) {

        QBuffer buffer(const_cast<QByteArray *>(&contents));

        return load(qt_inflateGZipDataFrom(&buffer));

    }

#endif

    QSvgHandler handler(contents);

    QSvgTinyDocument *doc = 0;

    if (handler.ok()) {

        doc = handler.document();

        doc->m_animationDuration = handler.animationDuration();

    }

    return doc;

}

QSvgTinyDocument * QSvgTinyDocument::load(QXmlStreamReader *contents)

{

    QSvgHandler handler(contents);

    QSvgTinyDocument *doc = 0;

    if (handler.ok()) {

        doc = handler.document();

        doc->m_animationDuration = handler.animationDuration();

    }

    return doc;

}

void QSvgTinyDocument::draw(QPainter *p, const QRectF &bounds)

{

    if (m_time.isNull()) {

        m_time.start();

    }

    if (displayMode() == QSvgNode::NoneMode)

        return;

    p->save();

    //sets default style on the painter

    //### not the most optimal way

    mapSourceToTarget(p, bounds);

    QPen pen(Qt::NoBrush, 1, Qt::SolidLine, Qt::FlatCap, Qt::MiterJoin);

    pen.setMiterLimit(4);

    p->setPen(pen);

    p->setBrush(Qt::black);

    p->setRenderHint(QPainter::Antialiasing);

    p->setRenderHint(QPainter::SmoothPixmapTransform);

    QList<QSvgNode*>::iterator itr = m_renderers.begin();

    applyStyle(p, m_states);

    while (itr != m_renderers.end()) {

        QSvgNode *node = *itr;

        if ((node->isVisible()) && (node->displayMode() != QSvgNode::NoneMode))

            node->draw(p, m_states);

        ++itr;

    }

    revertStyle(p, m_states);

    p->restore();

}

void QSvgTinyDocument::draw(QPainter *p, const QString &id,

                            const QRectF &bounds)

{

    QSvgNode *node = scopeNode(id);

    if (!node) {

        qDebug("Couldn't find node %s. Skipping rendering.", qPrintable(id));

        return;

    }

    if (m_time.isNull()) {

        m_time.start();

    }

    if (node->displayMode() == QSvgNode::NoneMode)

        return;

    p->save();

    const QRectF elementBounds = node->transformedBounds(QTransform());

    mapSourceToTarget(p, bounds, elementBounds);

    QTransform originalTransform = p->worldTransform();

    //XXX set default style on the painter

    QPen pen(Qt::NoBrush, 1, Qt::SolidLine, Qt::FlatCap, Qt::MiterJoin);

    pen.setMiterLimit(4);

    p->setPen(pen);

    p->setBrush(Qt::black);

    p->setRenderHint(QPainter::Antialiasing);

    p->setRenderHint(QPainter::SmoothPixmapTransform);

    QStack<QSvgNode*> parentApplyStack;

    QSvgNode *parent = node->parent();

    while (parent) {

        parentApplyStack.push(parent);

        parent = parent->parent();

    }

    for (int i = parentApplyStack.size() - 1; i >= 0; --i)

        parentApplyStack[i]->applyStyle(p, m_states);

    // Reset the world transform so that our parents don't affect

    // the position

    QTransform currentTransform = p->worldTransform();

    p->setWorldTransform(originalTransform);

    node->draw(p, m_states);

    p->setWorldTransform(currentTransform);

    for (int i = 0; i < parentApplyStack.size(); ++i)

        parentApplyStack[i]->revertStyle(p, m_states);

    //p->fillRect(bounds.adjusted(-5, -5, 5, 5), QColor(0, 0, 255, 100));

    p->restore();

}

QSvgNode::Type QSvgTinyDocument::type() const

{

    return DOC;

}

void QSvgTinyDocument::setWidth(int len, bool percent)

{

    m_size.setWidth(len);

    m_widthPercent = percent;

}

void QSvgTinyDocument::setHeight(int len, bool percent)

{

    m_size.setHeight(len);

    m_heightPercent = percent;

}

void QSvgTinyDocument::setViewBox(const QRectF &rect)

{

    m_viewBox = rect;

}

void QSvgTinyDocument::addSvgFont(QSvgFont *font)

{

    m_fonts.insert(font->familyName(), font);

}

QSvgFont * QSvgTinyDocument::svgFont(const QString &family) const

{

    return m_fonts[family];

}

void QSvgTinyDocument::addNamedNode(const QString &id, QSvgNode *node)

{

    m_namedNodes.insert(id, node);

}

QSvgNode *QSvgTinyDocument::namedNode(const QString &id) const

{

    return m_namedNodes.value(id);

}

void QSvgTinyDocument::addNamedStyle(const QString &id, QSvgFillStyleProperty *style)

{

    m_namedStyles.insert(id, style);

}

QSvgFillStyleProperty *QSvgTinyDocument::namedStyle(const QString &id) const

{

    return m_namedStyles.value(id);

}

void QSvgTinyDocument::restartAnimation()

{

    m_time.restart();

}

bool QSvgTinyDocument::animated() const

{

    return m_animated;

}

void QSvgTinyDocument::setAnimated(bool a)

{

    m_animated = a;

}

void QSvgTinyDocument::draw(QPainter *p)

{

    draw(p, QRectF());

}

void QSvgTinyDocument::draw(QPainter *p, QSvgExtraStates &)

{

    draw(p);

}

void QSvgTinyDocument::mapSourceToTarget(QPainter *p, const QRectF &targetRect, const QRectF &sourceRect)

{

    QRectF target = targetRect;

    if (target.isNull()) {

        QPaintDevice *dev = p->device();

        QRectF deviceRect(0, 0, dev->width(), dev->height());

        if (deviceRect.isNull()) {

            if (sourceRect.isNull())

                target = QRectF(QPointF(0, 0), size());

            else

                target = QRectF(QPointF(0, 0), sourceRect.size());

        } else {

            target = deviceRect;

        }

    }

    QRectF source = sourceRect;

    if (source.isNull())

        source = viewBox();

    if (source != target && !source.isNull()) {

        QTransform transform;

        transform.scale(target.width() / source.width(),

                  target.height() / source.height());

        QRectF c2 = transform.mapRect(source);

        p->translate(target.x() - c2.x(),

                     target.y() - c2.y());

        p->scale(target.width() / source.width(),

                 target.height() / source.height());

    }

}

QRectF QSvgTinyDocument::boundsOnElement(const QString &id) const

{

    const QSvgNode *node = scopeNode(id);

    if (!node)

        node = this;

    return node->transformedBounds(QTransform());

}

bool QSvgTinyDocument::elementExists(const QString &id) const

{

    QSvgNode *node = scopeNode(id);

    return (node!=0);

}

QMatrix QSvgTinyDocument::matrixForElement(const QString &id) const

{

    QSvgNode *node = scopeNode(id);

    if (!node) {

        qDebug("Couldn't find node %s. Skipping rendering.", qPrintable(id));

        return QMatrix();

    }

    QTransform t;

    node = node->parent();

    while (node) {

        if (node->m_style.transform)

            t *= node->m_style.transform->qtransform();

        node = node->parent();

    }

    return t.toAffine();

}

int QSvgTinyDocument::currentFrame() const

{

    double runningPercentage = qMin(m_time.elapsed()/double(m_animationDuration), 1.);

    int totalFrames = m_fps * m_animationDuration;

    return int(runningPercentage * totalFrames);

}

void QSvgTinyDocument::setCurrentFrame(int frame)

{

    int totalFrames = m_fps * m_animationDuration;

    double framePercentage = frame/double(totalFrames);

    double timeForFrame = m_animationDuration * framePercentage; //in S

    timeForFrame *= 1000; //in ms

    int timeToAdd = int(timeForFrame - m_time.elapsed());

    m_time = m_time.addMSecs(timeToAdd);

}

void QSvgTinyDocument::setFramesPerSecond(int num)

{

    m_fps = num;

}

QT_END_NAMESPACE

#endif // QT_NO_SVG