/*  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 "x11renderer.h"

#ifndef Q_WS_QWS

#include <QtGui/QPalette>

#include <QtGui/QApplication>

#include <QtGui/QPainter>

#include <X11/Xlib.h>

#include <gst/gst.h>

#include <gst/interfaces/xoverlay.h>

#include <gst/interfaces/propertyprobe.h>

#include "common.h"

#include "mediaobject.h"

#include "message.h"

QT_BEGIN_NAMESPACE

namespace Phonon

{

namespace Gstreamer

{

class OverlayWidget : public QWidget

{

public:

    OverlayWidget(VideoWidget *videoWidget, X11Renderer *renderer) : 

                  QWidget(videoWidget), 

                  m_videoWidget(videoWidget), 

                  m_renderer(renderer) { }

    void paintEvent(QPaintEvent *) {

        Phonon::State state = m_videoWidget->root() ? m_videoWidget->root()->state() : Phonon::LoadingState;

        if (state == Phonon::PlayingState || state == Phonon::PausedState) {

            m_renderer->windowExposed();

        } else {

            QPainter painter(this);

            painter.fillRect(m_videoWidget->rect(), m_videoWidget->palette().background());

        }

    }

private:

    VideoWidget *m_videoWidget;

    X11Renderer *m_renderer;

};

X11Renderer::X11Renderer(VideoWidget *videoWidget)

        : AbstractRenderer(videoWidget)

{

    m_renderWidget = new OverlayWidget(videoWidget, this);

    videoWidget->backend()->logMessage("Creating X11 overlay renderer");

    QPalette palette;

    palette.setColor(QPalette::Background, Qt::black);

    m_videoWidget->setPalette(palette);

    m_videoWidget->setAutoFillBackground(true);

    m_renderWidget->setMouseTracking(true);

    m_videoSink = createVideoSink();

    aspectRatioChanged(videoWidget->aspectRatio());

    setOverlay();

}

X11Renderer::~X11Renderer()

{

    m_renderWidget->setAttribute(Qt::WA_PaintOnScreen, false);

    m_renderWidget->setAttribute(Qt::WA_NoSystemBackground, false);

    delete m_renderWidget;

}

GstElement* X11Renderer::createVideoSink()

{

    GstElement *videoSink = gst_element_factory_make ("xvimagesink", NULL);

    if (videoSink) {

        // Check if the xv sink is usable

        if (gst_element_set_state(videoSink, GST_STATE_READY) != GST_STATE_CHANGE_SUCCESS) {

            gst_object_unref(GST_OBJECT(videoSink));

            videoSink = 0;

        } else {

            // Note that this should not really be neccessary as these are 

            // default values, though under certain conditions values are retained

            // even between application instances. (reproducible on 0.10.16/Gutsy)

            g_object_set(G_OBJECT(videoSink), "brightness", 0, (const char*)NULL);

            g_object_set(G_OBJECT(videoSink), "contrast", 0, (const char*)NULL);

            g_object_set(G_OBJECT(videoSink), "hue", 0, (const char*)NULL);

            g_object_set(G_OBJECT(videoSink), "saturation", 0, (const char*)NULL);

        }

    }

    if (!videoSink)

        videoSink = gst_element_factory_make ("ximagesink", NULL);

    gst_object_ref (GST_OBJECT (videoSink)); //Take ownership

    gst_object_sink (GST_OBJECT (videoSink));

    return videoSink;

}

void X11Renderer::handleMediaNodeEvent(const MediaNodeEvent *event)

{

    switch (event->type()) {

    case MediaNodeEvent::SourceChanged:

        setOverlay(); // We need to do this whenever the pipeline is reset

        break;        // otherwise the videosink will open in its own window

    default:

        break;

    }

}

void X11Renderer::aspectRatioChanged(Phonon::VideoWidget::AspectRatio)

{

    if (m_renderWidget) {

        m_renderWidget->setGeometry(m_videoWidget->calculateDrawFrameRect());

    }

}

void X11Renderer::scaleModeChanged(Phonon::VideoWidget::ScaleMode)

{

    if (m_renderWidget) {

        m_renderWidget->setGeometry(m_videoWidget->calculateDrawFrameRect());

    }

}

void X11Renderer::movieSizeChanged(const QSize &movieSize)

{

    Q_UNUSED(movieSize);

    if (m_renderWidget) {

        m_renderWidget->setGeometry(m_videoWidget->calculateDrawFrameRect());

    }

}

bool X11Renderer::eventFilter(QEvent *e)

{

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

        // Setting these values ensures smooth resizing since it

        // will prevent the system from clearing the background

        m_renderWidget->setAttribute(Qt::WA_NoSystemBackground, true);

        m_renderWidget->setAttribute(Qt::WA_PaintOnScreen, true);

        setOverlay();

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

        // This is a workaround for missing background repaints

        // when reducing window size

        m_renderWidget->setGeometry(m_videoWidget->calculateDrawFrameRect());

        windowExposed();

    }

    return false;

}

void X11Renderer::handlePaint(QPaintEvent *)

{

    QPainter painter(m_videoWidget);

    painter.fillRect(m_videoWidget->rect(), m_videoWidget->palette().background());

}

void X11Renderer::setOverlay()

{

    if (m_videoSink && GST_IS_X_OVERLAY(m_videoSink)) {

        WId windowId = m_renderWidget->winId();

        // Even if we have created a winId at this point, other X applications

        // need to be aware of it.

        QApplication::syncX();

        gst_x_overlay_set_xwindow_id ( GST_X_OVERLAY(m_videoSink) ,  windowId );

    }

    windowExposed();

    m_overlaySet = true;

}

void X11Renderer::windowExposed()

{

    QApplication::syncX();

    if (m_videoSink && GST_IS_X_OVERLAY(m_videoSink))

        gst_x_overlay_expose(GST_X_OVERLAY(m_videoSink));

}

}

} //namespace Phonon::Gstreamer

QT_END_NAMESPACE

#endif // Q_WS_QWS