/****************************************************************************
**
** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
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** Contact: Nokia Corporation (qt-info@nokia.com)
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** This file is part of the QtGui module of the Qt Toolkit.
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** 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:
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** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU General
** Public License version 3.0 as published by the Free Software Foundation
** and appearing in the file LICENSE.GPL included in the packaging of this
** file. Please review the following information to ensure the GNU General
** Public License version 3.0 requirements will be met:
** http://www.gnu.org/copyleft/gpl.html.
**
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** Alternatively, this file may be used in accordance with the terms and
** conditions contained in a signed written agreement between you and Nokia.
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** $QT_END_LICENSE$
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****************************************************************************/

#include <private/qgraphicssystem_runtime_p.h>
#include <private/qgraphicssystem_raster_p.h>
#include <private/qgraphicssystemfactory_p.h>
#include <private/qapplication_p.h>
#include <private/qwidget_p.h>
#include <QtCore/QDebug>
#include <QtCore/QTimer>
#include <QtGui/QBitmap>

QT_BEGIN_NAMESPACE

static int qt_pixmap_serial = 0;

#define READBACK(f)                                         \
    f                                                       \
    readBackInfo();


class QDeferredGraphicsSystemChange : public QObject
{
    Q_OBJECT

public:
    QDeferredGraphicsSystemChange(QRuntimeGraphicsSystem *gs, const QString& graphicsSystemName)
    : m_graphicsSystem(gs), m_graphicsSystemName(graphicsSystemName)
    {
    }

    void launch()
    {
        QTimer::singleShot(0, this, SLOT(doChange()));
    }

private slots:

    void doChange()
    {
        m_graphicsSystem->setGraphicsSystem(m_graphicsSystemName);
        deleteLater();
    }

private:

    QRuntimeGraphicsSystem *m_graphicsSystem;
    QString m_graphicsSystemName;
};

QRuntimePixmapData::QRuntimePixmapData(const QRuntimeGraphicsSystem *gs, PixelType type)
        : QPixmapData(type, RuntimeClass), m_graphicsSystem(gs)
{
    setSerialNumber(++qt_pixmap_serial);
}

QRuntimePixmapData::~QRuntimePixmapData()
{
    if (QApplicationPrivate::graphics_system)
        m_graphicsSystem->removePixmapData(this);
    delete m_data;
}

void QRuntimePixmapData::readBackInfo()
{
    w = m_data->width();
    h = m_data->height();
    d = m_data->depth();
    is_null = m_data->isNull();
}


QPixmapData *QRuntimePixmapData::createCompatiblePixmapData() const
{
    QRuntimePixmapData *rtData = new QRuntimePixmapData(m_graphicsSystem, pixelType());
    rtData->m_data = m_data->createCompatiblePixmapData();
    return rtData;
}


void QRuntimePixmapData::resize(int width, int height)
{
    READBACK(
        m_data->resize(width, height);
    )
}


void QRuntimePixmapData::fromImage(const QImage &image,
                                   Qt::ImageConversionFlags flags)
{
    READBACK(
        m_data->fromImage(image, flags);
    )
}


bool QRuntimePixmapData::fromFile(const QString &filename, const char *format,
                                  Qt::ImageConversionFlags flags)
{
    bool success(false);
    READBACK(
        success = m_data->fromFile(filename, format, flags);
    )
    return success;
}

bool QRuntimePixmapData::fromData(const uchar *buffer, uint len, const char *format,
                                  Qt::ImageConversionFlags flags)
{
    bool success(false);
    READBACK(
        success = m_data->fromData(buffer, len, format, flags);
    )
    return success;
}


void QRuntimePixmapData::copy(const QPixmapData *data, const QRect &rect)
{
    if (data->runtimeData()) {
        READBACK(
            m_data->copy(data->runtimeData(), rect);
        )
    } else {
        READBACK(
            m_data->copy(data, rect);
        )
    }
}

bool QRuntimePixmapData::scroll(int dx, int dy, const QRect &rect)
{
    return m_data->scroll(dx, dy, rect);
}


int QRuntimePixmapData::metric(QPaintDevice::PaintDeviceMetric metric) const
{
    return m_data->metric(metric);
}

void QRuntimePixmapData::fill(const QColor &color)
{
    return m_data->fill(color);
}

QBitmap QRuntimePixmapData::mask() const
{
    return m_data->mask();
}

void QRuntimePixmapData::setMask(const QBitmap &mask)
{
    READBACK(
        m_data->setMask(mask);
    )
}

bool QRuntimePixmapData::hasAlphaChannel() const
{
    return m_data->hasAlphaChannel();
}

QPixmap QRuntimePixmapData::transformed(const QTransform &matrix,
                                        Qt::TransformationMode mode) const
{
    return m_data->transformed(matrix, mode);
}

void QRuntimePixmapData::setAlphaChannel(const QPixmap &alphaChannel)
{
    READBACK(
        m_data->setAlphaChannel(alphaChannel);
    )
}

QPixmap QRuntimePixmapData::alphaChannel() const
{
    return m_data->alphaChannel();
}

QImage QRuntimePixmapData::toImage() const
{
    return m_data->toImage();
}

QPaintEngine* QRuntimePixmapData::paintEngine() const
{
    return m_data->paintEngine();
}

QImage* QRuntimePixmapData::buffer()
{
    return m_data->buffer();
}

#if defined(Q_OS_SYMBIAN)
void* QRuntimePixmapData::toNativeType(NativeType type)
{
    return m_data->toNativeType(type);
}

void QRuntimePixmapData::fromNativeType(void *pixmap, NativeType type)
{
    m_data->fromNativeType(pixmap, type);
    readBackInfo();
}
#endif

QPixmapData* QRuntimePixmapData::runtimeData() const
{
    return m_data;
}

QRuntimeWindowSurface::QRuntimeWindowSurface(const QRuntimeGraphicsSystem *gs, QWidget *window)
    : QWindowSurface(window), m_graphicsSystem(gs)
{

}

QRuntimeWindowSurface::~QRuntimeWindowSurface()
{
    if (QApplicationPrivate::graphics_system)
        m_graphicsSystem->removeWindowSurface(this);
}

QPaintDevice *QRuntimeWindowSurface::paintDevice()
{
    return m_windowSurface->paintDevice();
}

void QRuntimeWindowSurface::flush(QWidget *widget, const QRegion &region,
                                  const QPoint &offset)
{
    m_windowSurface->flush(widget, region, offset);

    int destroyPolicy = m_graphicsSystem->windowSurfaceDestroyPolicy();
    if(m_pendingWindowSurface &&
        destroyPolicy == QRuntimeGraphicsSystem::DestroyAfterFirstFlush) {
#ifdef QT_DEBUG
        qDebug() << "QRuntimeWindowSurface::flush() - destroy pending window surface";
#endif
        m_pendingWindowSurface.reset();
    }
}

void QRuntimeWindowSurface::setGeometry(const QRect &rect)
{
    QWindowSurface::setGeometry(rect);
    m_windowSurface->setGeometry(rect);
}

bool QRuntimeWindowSurface::scroll(const QRegion &area, int dx, int dy)
{
    return m_windowSurface->scroll(area, dx, dy);
}

void QRuntimeWindowSurface::beginPaint(const QRegion &rgn)
{
    m_windowSurface->beginPaint(rgn);
}

void QRuntimeWindowSurface::endPaint(const QRegion &rgn)
{
    m_windowSurface->endPaint(rgn);
}

QImage* QRuntimeWindowSurface::buffer(const QWidget *widget)
{
    return m_windowSurface->buffer(widget);
}

QPixmap QRuntimeWindowSurface::grabWidget(const QWidget *widget, const QRect& rectangle) const
{
    return m_windowSurface->grabWidget(widget, rectangle);
}

QPoint QRuntimeWindowSurface::offset(const QWidget *widget) const
{
    return m_windowSurface->offset(widget);
}

QRuntimeGraphicsSystem::QRuntimeGraphicsSystem()
    : m_windowSurfaceDestroyPolicy(DestroyImmediately),
      m_graphicsSystem(0)
{
    QApplicationPrivate::runtime_graphics_system = true;

#ifdef QT_DEFAULT_RUNTIME_SYSTEM
    m_graphicsSystemName = QLatin1String(QT_DEFAULT_RUNTIME_SYSTEM);
    if (m_graphicsSystemName.isNull())
#endif
        m_graphicsSystemName = QLatin1String("raster");

#ifdef Q_OS_SYMBIAN
    m_windowSurfaceDestroyPolicy = DestroyAfterFirstFlush;
#endif

    m_graphicsSystem = QGraphicsSystemFactory::create(m_graphicsSystemName);

    QApplicationPrivate::graphics_system_name = QLatin1String("runtime");
}


QPixmapData *QRuntimeGraphicsSystem::createPixmapData(QPixmapData::PixelType type) const
{
    Q_ASSERT(m_graphicsSystem);
    QPixmapData *data = m_graphicsSystem->createPixmapData(type);

    QRuntimePixmapData *rtData = new QRuntimePixmapData(this, type);
    rtData->m_data = data;
    m_pixmapDatas << rtData;

    return rtData;
}

QWindowSurface *QRuntimeGraphicsSystem::createWindowSurface(QWidget *widget) const
{
    Q_ASSERT(m_graphicsSystem);
    QRuntimeWindowSurface *rtSurface = new QRuntimeWindowSurface(this, widget);
    rtSurface->m_windowSurface.reset(m_graphicsSystem->createWindowSurface(widget));
    widget->setWindowSurface(rtSurface);
    m_windowSurfaces << rtSurface;
    return rtSurface;
}

void QRuntimeGraphicsSystem::setGraphicsSystem(const QString &name)
{
    if (m_graphicsSystemName == name)
        return;
#ifdef QT_DEBUG
    qDebug() << "QRuntimeGraphicsSystem::setGraphicsSystem( " << name << " )";
#endif
    QGraphicsSystem *oldSystem = m_graphicsSystem;
    m_graphicsSystem = QGraphicsSystemFactory::create(name);
    m_graphicsSystemName = name;

    Q_ASSERT(m_graphicsSystem);

    m_pendingGraphicsSystemName = QString();

    for (int i = 0; i < m_pixmapDatas.size(); ++i) {
        QRuntimePixmapData *proxy = m_pixmapDatas.at(i);
        QPixmapData *newData = m_graphicsSystem->createPixmapData(proxy->m_data);
        newData->fromImage(proxy->m_data->toImage(), Qt::NoOpaqueDetection);
        delete proxy->m_data;
        proxy->m_data = newData;
        proxy->readBackInfo();
    }

    for (int i = 0; i < m_windowSurfaces.size(); ++i) {
        QRuntimeWindowSurface *proxy = m_windowSurfaces.at(i);
        QWidget *widget = proxy->m_windowSurface->window();

        if(m_windowSurfaceDestroyPolicy == DestroyAfterFirstFlush)
            proxy->m_pendingWindowSurface.reset(proxy->m_windowSurface.take());

        QWindowSurface *newWindowSurface = m_graphicsSystem->createWindowSurface(widget);
        newWindowSurface->setGeometry(proxy->geometry());

        proxy->m_windowSurface.reset(newWindowSurface);
        qt_widget_private(widget)->invalidateBuffer(widget->rect());
    }

    delete oldSystem;
}

void QRuntimeGraphicsSystem::removePixmapData(QRuntimePixmapData *pixmapData) const
{
    int index = m_pixmapDatas.lastIndexOf(pixmapData);
    m_pixmapDatas.removeAt(index);
}

void QRuntimeGraphicsSystem::removeWindowSurface(QRuntimeWindowSurface *windowSurface) const
{
    int index = m_windowSurfaces.lastIndexOf(windowSurface);
    m_windowSurfaces.removeAt(index);
}

#include "qgraphicssystem_runtime.moc"

QT_END_NAMESPACE