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

**

** Copyright (C) 2008-2010 Nokia Corporation and/or its subsidiary(-ies).

** All rights reserved.

** Contact: Nokia Corporation (developer.feedback@nokia.com)

**

** This file is part of the HbCore module of the UI Extensions for Mobile.

**

** GNU Lesser General Public License Usage

** 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 developer.feedback@nokia.com.

**

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

// Macro HB_BOOTSTRAPPED builds a stripped version of HbIconSource that is

// used by ThemeIndexer build tool, to avoid unwanted dependencies.

#include "hbiconsource_p.h"

#ifndef HB_BOOTSTRAPPED

#include "hbiconloader_p.h"

#endif // HB_BOOTSTRAPPED

#include <QtSvg/QSvgRenderer>

#include <QPicture>

#include <QScopedPointer>

#include <QImageReader>

#include <QPixmap>

#include <QDir>

#include <QFile>

#include <QByteArray>

#ifndef HB_BOOTSTRAPPED

#ifdef HB_NVG_CS_ICON

#include "hbnvg_p.h"

#endif // HB_NVG_CS_ICON

#endif // HB_BOOTSTRAPPED

#ifdef HB_BOOTSTRAPPED

// Copied from HbIconLoader::formatFromPath,

// to avoid IconLoader dependency in ThemeIndexer, which needs this source file.

QString iconTypeFromFilename(const QString &iconPath)

{

    QString loweredIconPath = iconPath.toLower();

    if (loweredIconPath.endsWith(".svgz") ) {

        return "SVG";

    }

    if (loweredIconPath.endsWith(".qpic") ) {

        return "PIC";

    }

    if (loweredIconPath.endsWith(".svg")

        || loweredIconPath.endsWith(".png")

        || loweredIconPath.endsWith(".mng")

        || loweredIconPath.endsWith(".gif")

        || loweredIconPath.endsWith(".xpm")

        || loweredIconPath.endsWith(".jpg")

        || loweredIconPath.endsWith(".nvg")) {

        return iconPath.right(3).toUpper();

    }

    if (loweredIconPath.endsWith(".xml")

        || loweredIconPath.endsWith(".axml")

        || loweredIconPath.endsWith(".fxml"))

    {

        return "BLOB";

    }

    return iconPath.section('.', -1);

}

static const qint32 NVG_VIEWBOX_WIDTH_OFS   = 44;

static const qint32 NVG_VIEWBOX_HEIGHT_OFS  = 48;

// Copied from HbNvgEnginePrivate::contentDimensions,

// to avoid NVG dependency in ThemeIndexer

QSize nvgContentDimensions(const QByteArray &buffer)

{

    QSize ret(0,0);

     if (buffer.length() < static_cast<qint32>(NVG_VIEWBOX_HEIGHT_OFS + sizeof (float))){

        ret = QSize(0, 0);

        } 

    const quint8* lBuf = (quint8*) buffer.data();

    if((buffer.length() > NVG_VIEWBOX_WIDTH_OFS) && (buffer.length() > NVG_VIEWBOX_HEIGHT_OFS)) {	

	    float lViewboxWidth = * (float*)(lBuf + NVG_VIEWBOX_WIDTH_OFS);

	    float lViewboxHeight = * (float*)(lBuf + NVG_VIEWBOX_HEIGHT_OFS);

	    if (lViewboxWidth > 0 && lViewboxHeight > 0) {

	        ret = QSize((int)lViewboxWidth, (int)lViewboxHeight);

	    } else {

	        ret = QSize(0, 0);

	    }

    }

    return ret;

}

#endif // HB_BOOTSTRAPPED

/*!

  \class HbIconSource

  \brief Encapsulates access (size and pixel data reading) to image files.

  \internal

*/

HbIconSource::HbIconSource(const QString &filename) :

    mFilename(filename),

    mPicture(0),

    mPixmap(0),

    mByteArray(0),

    mSvgRenderer(0),

    mImageReader(0)

{

    mFullFilename = QDir(mFilename).absolutePath();

}

HbIconSource::HbIconSource(const QString &filename, const QString &type) :

    mFilename(filename),

    mType(type),

    mPicture(0),

    mPixmap(0),

    mByteArray(0),

    mSvgRenderer(0),

    mImageReader(0)

{

    mFullFilename = QDir(mFilename).absolutePath();

}

HbIconSource::~HbIconSource()

{

    delete mImageReader;

    delete mSvgRenderer;

    delete mPicture;

    delete mPixmap;

    delete mByteArray;

}

QString HbIconSource::filename() const

{

    return mFilename;

}

QString HbIconSource::type()

{

#ifndef HB_BOOTSTRAPPED

    if (mType.isEmpty()) {

        mType = HbIconLoader::formatFromPath(mFilename);

    }

#else

    mType = iconTypeFromFilename(mFilename);

#endif // HB_BOOTSTRAPPED

    return mType;

}

QSizeF HbIconSource::defaultSize()

{

    // If the default size has not been fetched yet, do it now.

    if (!mDefaultSize.isValid()) {

        type(); // make sure type is initialized

        if (mType == "NVG") {

#ifndef HB_BOOTSTRAPPED

#ifdef HB_NVG_CS_ICON

        if(!mByteArray){

            QFile file(mFilename);

            if (!file.open(QIODevice::NotOpen | QIODevice::ReadOnly)) {

                return QSizeF();

            }                

            mByteArray = new QByteArray(file.readAll());

        }

        HbNvgEngine nvgEngine; 

        mDefaultSize = nvgEngine.contentDimensions(*mByteArray);

#endif // HB_NVG_CS_ICON

#else // HB_BOOTSTRAPPED

        if(!mByteArray){

            QFile file(mFilename);

            if (!file.open(QIODevice::NotOpen | QIODevice::ReadOnly)) {

                return QSizeF();

            }                

            mByteArray = new QByteArray (file.readAll());

        }

        mDefaultSize = nvgContentDimensions(*mByteArray);

#endif

        }

        else if (mType == "SVG") {

            QSvgRenderer *renderer = svgRenderer();

            if (renderer) { // isValid() is already checked in svgRenderer()

                mDefaultSize = renderer->defaultSize();

            }

            releaseSvgRenderer();

        }

        else if (mType == "PIC") {

            if (!mPicture) {

                mPicture = new QPicture;

                mPicture->load(mFilename);

            }

            mDefaultSize = mPicture->boundingRect().size();

        }

        // Image reader supports getting the default size without rasterizing the image so

        // using it with the formats that it supports.

        else if (mType == "MNG" || mType == "GIF" || mType == "JPG" || mType == "PNG") {

            // Note that QImageReader::canRead() results in opening the file and so the

            // file will be locked until the QImageReader instance is

            // destroyed. Therefore the image reader instance must be destroyed as soon

            // as possible and must not be kept for later use.

            // Exception: Files on Z drive on Symbian. See canKeepOpen() and releaseImageReader().

            QImageReader *reader = imageReader();

            if (reader) { // canRead() is already checked in imageReader()

                if (mType != "MNG") {

                    mDefaultSize = reader->size();

                } else {

                    // MNG handler does not support size query so have to render it to get the size

                    QImage img = reader->read();

                    mDefaultSize = img.size();

                }

            }

            releaseImageReader();

        }

        else if (mType != "BLOB") {

            if (!mPixmap) {

                mPixmap = new QPixmap(mFilename);

            }

            mDefaultSize = mPixmap->size();

        }

    }

    return QSizeF(mDefaultSize);

}

/*!  Returns a QSvgRenderer instance. Ownership is not transferred to the

  caller. However make sure to call releaseSvgRenderer() as soon as possible.

 */

QSvgRenderer *HbIconSource::svgRenderer()

{

    if (!mSvgRenderer) {

        mSvgRenderer = new QSvgRenderer(mFilename);

    }

    return mSvgRenderer && mSvgRenderer->isValid() ? mSvgRenderer : 0;

}

/*!

    Must be called after the pointer returned by svgRenderer() is not needed by the client anymore.

*/

void HbIconSource::releaseSvgRenderer()

{

    if (mSvgRenderer && !canKeepOpen()) {

        delete mSvgRenderer;

        mSvgRenderer = 0;

    }

}

/*!

    Transfers the ownership of the pointer returned by svgRenderer() to the client.

*/

void HbIconSource::takeSvgRenderer()

{

    mSvgRenderer = 0;

}

QByteArray* HbIconSource::byteArray()

{

    if (!mByteArray) {

    #ifdef HB_NVG_CS_ICON

        QFile file(mFilename);

        if (!file.open(QIODevice::NotOpen | QIODevice::ReadOnly)) {

            return 0;

        }

        mByteArray = new QByteArray (file.readAll());

    #endif//nvg 

    }

    if (!mByteArray->isEmpty()) {

        return mByteArray;

    } else {

        return 0;

    }

}

QPicture *HbIconSource::picture()

{

    if (!mPicture) {

        mPicture = new QPicture;

        mPicture->load(mFilename);

    }

    return mPicture;

}

/*!  Returns a QImageReader instance. Ownership is not transferred to the

  caller. However make sure to call releaseImageReader() as soon as possible.

 */

QImageReader *HbIconSource::imageReader()

{

    if (!mImageReader) {

        mImageReader = new QImageReader(mFilename, mType.toLatin1());

    }

    return mImageReader && mImageReader->canRead() ? mImageReader : 0;

}

/*!

    Must be called after the pointer returned by imageReader() is not needed by the client anymore.

*/

void HbIconSource::releaseImageReader()

{

    if (mImageReader && !canKeepOpen()) {

        delete mImageReader;

        mImageReader = 0;

    }

}

/*!

    Transfers the ownership of the pointer returned by imageReader() to the client.

*/

void HbIconSource::takeImageReader()

{

    mImageReader = 0;

}

QPixmap *HbIconSource::pixmap()

{

    if (!mPixmap) {

        mPixmap = new QPixmap(mFilename);

    }

    return mPixmap;

}

void HbIconSource::deletePixmapIfLargerThan(int limitInBytes)

{

    if (mPixmap) {

        QSize size = mPixmap->size();

        int sizeInBytes = size.width() * size.height() * mPixmap->depth();

        sizeInBytes /= 8; // depth is in bits, we want bytes

        if (sizeInBytes > limitInBytes) {

            delete mPixmap;

            mPixmap = 0;

        }

    }

}

bool HbIconSource::canKeepOpen() const

{

#ifdef Q_OS_SYMBIAN

    if (mFullFilename.isEmpty()) {

        return false;

    } else {

        QChar driveLetter = mFullFilename.at(0);

        return driveLetter.toUpper() == 'Z';

    }

#else

    return false;

#endif

}