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

**

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

** All rights reserved.

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

**

** This file is part of the QtGui 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.

**

**

**

**

**

**

**

**

** $QT_END_LICENSE$

**

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

#include "qtextimagehandler_p.h"

#include <qapplication.h>

#include <qtextformat.h>

#include <qpainter.h>

#include <qdebug.h>

#include <private/qtextengine_p.h>

#include <qpalette.h>

#include <qtextbrowser.h>

#include <qthread.h>

QT_BEGIN_NAMESPACE

// set by the mime source factory in Qt3Compat

QTextImageHandler::ExternalImageLoaderFunction QTextImageHandler::externalLoader = 0;

static QPixmap getPixmap(QTextDocument *doc, const QTextImageFormat &format)

{

    QPixmap pm;

    QString name = format.name();

    if (name.startsWith(QLatin1String(":/"))) // auto-detect resources

        name.prepend(QLatin1String("qrc"));

    QUrl url = QUrl::fromEncoded(name.toUtf8());

    const QVariant data = doc->resource(QTextDocument::ImageResource, url);

    if (data.type() == QVariant::Pixmap || data.type() == QVariant::Image) {

        pm = qvariant_cast<QPixmap>(data);

    } else if (data.type() == QVariant::ByteArray) {

        pm.loadFromData(data.toByteArray());

    }

    if (pm.isNull()) {

        QString context;

#ifndef QT_NO_TEXTBROWSER

        QTextBrowser *browser = qobject_cast<QTextBrowser *>(doc->parent());

        if (browser)

            context = browser->source().toString();

#endif

        QImage img;

        if (QTextImageHandler::externalLoader)

            img = QTextImageHandler::externalLoader(name, context);

        if (img.isNull()) { // try direct loading

            name = format.name(); // remove qrc:/ prefix again

            if (name.isEmpty() || !img.load(name))

                return QPixmap(QLatin1String(":/trolltech/styles/commonstyle/images/file-16.png"));

        }

        pm = QPixmap::fromImage(img);

        doc->addResource(QTextDocument::ImageResource, url, pm);

    }

    return pm;

}

static QSize getPixmapSize(QTextDocument *doc, const QTextImageFormat &format)

{

    QPixmap pm;

    const bool hasWidth = format.hasProperty(QTextFormat::ImageWidth);

    const int width = qRound(format.width());

    const bool hasHeight = format.hasProperty(QTextFormat::ImageHeight);

    const int height = qRound(format.height());

    QSize size(width, height);

    if (!hasWidth || !hasHeight) {

        pm = getPixmap(doc, format);

        if (!hasWidth) {

            if (!hasHeight)

                size.setWidth(pm.width());

            else

                size.setWidth(qRound(height * (pm.width() / (qreal) pm.height())));

        }

        if (!hasHeight) {

            if (!hasWidth)

                size.setHeight(pm.height());

            else

                size.setHeight(qRound(width * (pm.height() / (qreal) pm.width())));

        }

    }

    qreal scale = 1.0;

    QPaintDevice *pdev = doc->documentLayout()->paintDevice();

    if (pdev) {

        extern int qt_defaultDpi();

        if (pm.isNull())

            pm = getPixmap(doc, format);

        if (!pm.isNull())

            scale = qreal(pdev->logicalDpiY()) / qreal(qt_defaultDpi());

    }

    size *= scale;

    return size;

}

static QImage getImage(QTextDocument *doc, const QTextImageFormat &format)

{

    QImage image;

    QString name = format.name();

    if (name.startsWith(QLatin1String(":/"))) // auto-detect resources

        name.prepend(QLatin1String("qrc"));

    QUrl url = QUrl::fromEncoded(name.toUtf8());

    const QVariant data = doc->resource(QTextDocument::ImageResource, url);

    if (data.type() == QVariant::Image) {

        image = qvariant_cast<QImage>(data);

    } else if (data.type() == QVariant::ByteArray) {

        image.loadFromData(data.toByteArray());

    }

    if (image.isNull()) {

        QString context;

#ifndef QT_NO_TEXTBROWSER

        QTextBrowser *browser = qobject_cast<QTextBrowser *>(doc->parent());

        if (browser)

            context = browser->source().toString();

#endif

        if (QTextImageHandler::externalLoader)

            image = QTextImageHandler::externalLoader(name, context);

        if (image.isNull()) { // try direct loading

            name = format.name(); // remove qrc:/ prefix again

            if (name.isEmpty() || !image.load(name))

                return QImage(QLatin1String(":/trolltech/styles/commonstyle/images/file-16.png"));

        }

        doc->addResource(QTextDocument::ImageResource, url, image);

    }

    return image;

}

static QSize getImageSize(QTextDocument *doc, const QTextImageFormat &format)

{

    QImage image;

    const bool hasWidth = format.hasProperty(QTextFormat::ImageWidth);

    const int width = qRound(format.width());

    const bool hasHeight = format.hasProperty(QTextFormat::ImageHeight);

    const int height = qRound(format.height());

    QSize size(width, height);

    if (!hasWidth || !hasHeight) {

        image = getImage(doc, format);

        if (!hasWidth)

            size.setWidth(image.width());

        if (!hasHeight)

            size.setHeight(image.height());

    }

    qreal scale = 1.0;

    QPaintDevice *pdev = doc->documentLayout()->paintDevice();

    if (pdev) {

        extern int qt_defaultDpi();

        if (image.isNull())

            image = getImage(doc, format);

        if (!image.isNull())

            scale = qreal(pdev->logicalDpiY()) / qreal(qt_defaultDpi());

    }

    size *= scale;

    return size;

}

QTextImageHandler::QTextImageHandler(QObject *parent)

    : QObject(parent)

{

}

QSizeF QTextImageHandler::intrinsicSize(QTextDocument *doc, int posInDocument, const QTextFormat &format)

{

    Q_UNUSED(posInDocument)

    const QTextImageFormat imageFormat = format.toImageFormat();

    if (qApp->thread() != QThread::currentThread())

        return getImageSize(doc, imageFormat);

    return getPixmapSize(doc, imageFormat);

}

void QTextImageHandler::drawObject(QPainter *p, const QRectF &rect, QTextDocument *doc, int posInDocument, const QTextFormat &format)

{

    Q_UNUSED(posInDocument)

        const QTextImageFormat imageFormat = format.toImageFormat();

    if (qApp->thread() != QThread::currentThread()) {

        const QImage image = getImage(doc, imageFormat);

        p->drawImage(rect, image, image.rect());

    } else {

        const QPixmap pixmap = getPixmap(doc, imageFormat);

        p->drawPixmap(rect, pixmap, pixmap.rect());

    }

}

QT_END_NAMESPACE