/*  This file is part of the KDE project.

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

This library is free software: you can redistribute it and/or modify

it under the terms of the GNU Lesser General Public License as published by

the Free Software Foundation, either version 2.1 or 3 of the License.

This library is distributed in the hope that it will be useful,

but WITHOUT ANY WARRANTY; without even the implied warranty of

MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

GNU Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License

along with this library.  If not, see <http://www.gnu.org/licenses/>.

*/

#include "videowidget.h"

#include <QtGui/QPainter>

#include <QtGui/QPaintEvent>

#include <QtCore/QTimer>

#include <QtCore/QSettings>

#include "mediaobject.h"

#include "videorenderer_vmr9.h"

#include "videorenderer_soft.h"

QT_BEGIN_NAMESPACE

#ifndef QT_NO_PHONON_VIDEO

namespace Phonon

{

    namespace DS9

    {

        //class used internally to return the widget where the video is shown on

        class VideoWindow : public QWidget

        {

        public:

            explicit VideoWindow(QWidget *parent, VideoWidget *vw)

                : QWidget(parent), m_node(vw), m_currentRenderer(0)

            {

                //default background color

                setPalette(QPalette(Qt::black));                 

                setAttribute(Qt::WA_OpaquePaintEvent, true);

                setAttribute(Qt::WA_NoSystemBackground, true);

                setAttribute(Qt::WA_PaintOnScreen, true);

                setAutoFillBackground(false);

            }

            QPaintEngine* paintEngine() const

            {

                return 0;

            }

            bool isEmbedded() const

            {

#if QT_VERSION >= 0x040400

                return window()->testAttribute(Qt::WA_DontShowOnScreen);

#else

                return false;

#endif

            }

            bool needsSoftRendering() const

            {

                QPaintDevice *dev = QPainter::redirected(this, 0);

                return (dev && dev != this);

            }

            void resizeEvent(QResizeEvent *e)

            {

                m_node->updateVideoSize();

                QWidget::resizeEvent(e);

            }

            AbstractVideoRenderer *currentRenderer() const

            {

                return m_currentRenderer;

            }

            void setCurrentRenderer(AbstractVideoRenderer *renderer)

            {

                m_currentRenderer = renderer;

                //we disallow repaint on that widget for just a fraction of second

                //this allows better transition between videos

                setUpdatesEnabled(false);

                m_flickerFreeTimer.start(20, this);

            }

            void timerEvent(QTimerEvent *e)

            {

                if (e->timerId() == m_flickerFreeTimer.timerId()) {

                    m_flickerFreeTimer.stop();

                    setUpdatesEnabled(true);

                }

                QWidget::timerEvent(e);

            }

            QSize sizeHint() const

            {

                return m_currentRenderer->sizeHint().expandedTo(QWidget::sizeHint());

            }

            void changeEvent(QEvent *e)

            {

                checkCurrentRenderingMode();

                QWidget::changeEvent(e);

            }

            void setVisible(bool visible)

            {

                checkCurrentRenderingMode();

                QWidget::setVisible(visible);

            }

            void paintEvent(QPaintEvent *e)

            {

                if (!updatesEnabled())

                    return; //this avoids repaint from native events

                checkCurrentRenderingMode();

                m_currentRenderer->repaintCurrentFrame(this, e->rect());

            }

            //this code manages the activation/deactivation of the screensaver

            /*bool event(QEvent *e)

            {

                if (e->type() == QEvent::Resize) {

                    //we disable the screensaver if the video is in fullscreen mode

                    disableScreenSaver(window()->windowState() & Qt::WindowFullScreen);

                }

                return QWidget::event(e);

            }*/

        private:

            //for fullscreen mode

            void disableScreenSaver(bool b)

            {

                const QLatin1String screenSaverActive("ScreenSaveActive");

                QSettings settings( QLatin1String("HKEY_CURRENT_USER\\Control Panel\\Desktop"), QSettings::NativeFormat);

                if (b) {

                    if (m_restoreScreenSaverActive.isNull()) {

                        //we store the value to be able to restore it later

                        m_restoreScreenSaverActive = settings.value(screenSaverActive);

                        settings.setValue(screenSaverActive, QString::number(!b));

                    }

                } else if (!m_restoreScreenSaverActive.isNull()) {

                    //we restore the previous value

                    settings.setValue(screenSaverActive, m_restoreScreenSaverActive);

                }

            }

            void checkCurrentRenderingMode()

            {

                if (!m_currentRenderer)

                    return;

                if (m_currentRenderer->isNative()) {

                    if (isEmbedded()) {

                        //we need to switch to software renderer

                        m_currentRenderer = m_node->switchRendering(m_currentRenderer);

                        setAttribute(Qt::WA_PaintOnScreen, false);

                    } else if (needsSoftRendering()) {

                        m_node->performSoftRendering(m_currentRenderer->snapshot());

                    }

                } else if (!isEmbedded()) {

                    m_currentRenderer = m_node->switchRendering(m_currentRenderer);

                    setAttribute(Qt::WA_PaintOnScreen, false);

                }

            }

            VideoWidget *m_node;

            AbstractVideoRenderer *m_currentRenderer;

            QVariant m_restoreScreenSaverActive;

            QBasicTimer m_flickerFreeTimer;

        };

        VideoWidget::VideoWidget(QWidget *parent)

            : BackendNode(parent), m_aspectRatio(Phonon::VideoWidget::AspectRatioAuto),

              m_scaleMode(Phonon::VideoWidget::FitInView),

              m_brightness(0.), m_contrast(0.), m_hue(0.), m_saturation(0.), m_noNativeRendererSupported(false)

        {

            //initialisation of the widget

            m_widget = new VideoWindow(parent, this);

            //initialization of the renderers

            qMemSet(m_renderers, 0, sizeof(m_renderers));

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

                //This might return a non native (ie Qt) renderer in case native is not supported

                AbstractVideoRenderer *renderer = getRenderer(i, Native, true);

                m_filters[i] = renderer->getFilter();

            }

            //by default, we take the first VideoWindow object

            setCurrentGraph(0);

        }

        VideoWidget::~VideoWidget()

        {

            for (int i = 0; i < 4; ++i) {

                delete m_renderers[i];

            }

        }

        void VideoWidget::notifyVideoLoaded()

        {

            updateVideoSize();

            m_widget->updateGeometry();

        }

        AbstractVideoRenderer *VideoWidget::switchRendering(AbstractVideoRenderer *current)

        {

            const bool toNative = !current->isNative();

            if (toNative && m_noNativeRendererSupported)

                return current; //no switch here

            if (!mediaObject())

                return current;

            //firt we delete the renderer

            //initialization of the widgets

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

                Filter oldFilter = m_filters[i];

                //Let's create a software renderer

                AbstractVideoRenderer *renderer = getRenderer(i, toNative ? Native : NonNative, true);

                if (m_mediaObject) {

                    m_mediaObject->switchFilters(i, oldFilter, renderer->getFilter());

                }

                m_filters[i] = renderer->getFilter();

            }

            return getRenderer(mediaObject()->currentGraph()->index(), toNative ? Native: NonNative);

        }

        void VideoWidget::performSoftRendering(const QImage &currentImage)

        {

            const int graphIndex = mediaObject()->currentGraph()->index();

            VideoRendererSoft *r = static_cast<VideoRendererSoft*>(getRenderer(graphIndex, NonNative, true /*autocreation*/));

            r->setSnapshot(currentImage);

            r->notifyResize(m_widget->size(), m_aspectRatio, m_scaleMode);

            r->repaintCurrentFrame(m_widget, m_widget->rect());

        }

        void VideoWidget::setCurrentGraph(int index)

        {

            for(int i = 0; i < 2; ++i) {

                if (AbstractVideoRenderer *renderer = getRenderer(i, Native))

                    renderer->setActive(index == i);

            }

            //be sure to update all the things that needs an update

            applyMixerSettings();

            updateVideoSize();

            AbstractVideoRenderer *r = m_widget->currentRenderer();

            //we determine dynamically if it is native or non native

            r = getRenderer(index, !r || r->isNative() ? Native : NonNative);

			if (!r)

				r = getRenderer(index, NonNative);

            m_widget->setCurrentRenderer(r);

        }

        Phonon::VideoWidget::AspectRatio VideoWidget::aspectRatio() const

        {

            return m_aspectRatio;

        }

        void VideoWidget::setAspectRatio(Phonon::VideoWidget::AspectRatio aspectRatio)

        {

            m_aspectRatio = aspectRatio;

            updateVideoSize();

            m_widget->update();

        }

        Phonon::VideoWidget::ScaleMode VideoWidget::scaleMode() const

        {

            return m_scaleMode;

        }

        QWidget *VideoWidget::widget()

        {

            return m_widget;

        }

        void VideoWidget::setScaleMode(Phonon::VideoWidget::ScaleMode scaleMode)

        {

            m_scaleMode = scaleMode;

            updateVideoSize();

            m_widget->update();

        }

        void VideoWidget::setBrightness(qreal b)

        {

            m_brightness = b;

            applyMixerSettings();

        }

        void VideoWidget::setContrast(qreal c)

        {

            m_contrast = c;

            applyMixerSettings();

        }

        void VideoWidget::setHue(qreal h)

        {

            m_hue = h;

            applyMixerSettings();

        }

        void VideoWidget::setSaturation(qreal s)

        {

            m_saturation = s;

            applyMixerSettings();

        }

        qreal VideoWidget::brightness() const

        {

            return m_brightness;

        }

        qreal VideoWidget::contrast() const

        {

            return m_contrast;

        }

        qreal VideoWidget::hue() const

        {

            return m_hue;

        }

        qreal VideoWidget::saturation() const

        {

            return m_saturation;

        }

        AbstractVideoRenderer *VideoWidget::getRenderer(int graphIndex, RendererType type, bool autoCreate)

        {

            int index = graphIndex * 2 + type;

            if (m_renderers[index] == 0 && autoCreate) {

                AbstractVideoRenderer *renderer = 0;

				if (type == Native) {

                    renderer = new VideoRendererVMR9(m_widget);

                    if (renderer->getFilter() == 0) {

                        //instanciating the renderer might fail with error VFW_E_DDRAW_CAPS_NOT_SUITABLE (0x80040273)

                        m_noNativeRendererSupported = true;

                        delete renderer;

                        renderer = 0;

                    }

                }

                if (renderer == 0) {

                    type = NonNative;

                    index = graphIndex * 2 + type;

                    if (m_renderers[index] == 0)

                        renderer = new VideoRendererSoft(m_widget); //this always succeeds

                    else

                        renderer = m_renderers[index];

                }

                m_renderers[index] = renderer;

                //be sure to update all the things that needs an update

                applyMixerSettings();

                updateVideoSize();

            }

            return m_renderers[index];

        }

        //this must be called whe nthe node is actually connected

        void  VideoWidget::applyMixerSettings() const

        {

            for (int i = 0; i < 4; ++i) {

                if (AbstractVideoRenderer *renderer = m_renderers[i])

                    renderer->applyMixerSettings(m_brightness, m_contrast, m_hue, m_saturation);

            }

        }

        void VideoWidget::connected(BackendNode *, const InputPin&)

        {

            //in case of a connection, we simply reapply the mixer settings

            applyMixerSettings();

            updateVideoSize();

        }

        void VideoWidget::updateVideoSize() const

        {

            for (int i = 0; i < 4; ++i) {

                if (AbstractVideoRenderer *renderer = m_renderers[i])

                    renderer->notifyResize(m_widget->size(), m_aspectRatio, m_scaleMode);

            }

        }

    }

}

#endif //QT_NO_PHONON_VIDEO

QT_END_NAMESPACE

#include "moc_videowidget.cpp"