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#include "qgraphicssystem_trace_p.h"

#include <private/qpixmap_raster_p.h>

#include <private/qpaintbuffer_p.h>

#include <private/qwindowsurface_raster_p.h>

#include <QFile>

#include <QPainter>

#include <QtDebug>

QT_BEGIN_NAMESPACE

class QTraceWindowSurface : public QRasterWindowSurface

{

public:

    QTraceWindowSurface(QWidget *widget);

    ~QTraceWindowSurface();

    QPaintDevice *paintDevice();

    void beginPaint(const QRegion &rgn);

    void endPaint(const QRegion &rgn);

    bool scroll(const QRegion &area, int dx, int dy);

private:

    QPaintBuffer *buffer;

    QList<QRegion> updates;

    qulonglong winId;

};

QTraceWindowSurface::QTraceWindowSurface(QWidget *widget)

    : QRasterWindowSurface(widget)

    , buffer(0)

    , winId(0)

{

}

QTraceWindowSurface::~QTraceWindowSurface()

{

    if (buffer) {

        QFile outputFile(QString(QLatin1String("qtgraphics-%0.trace")).arg(winId));

        if (outputFile.open(QIODevice::WriteOnly)) {

            QDataStream out(&outputFile);

            out << *buffer << updates;

        }

        delete buffer;

    }

}

QPaintDevice *QTraceWindowSurface::paintDevice()

{

    if (!buffer) {

        buffer = new QPaintBuffer;

        buffer->setBoundingRect(geometry());

    }

    return buffer;

}

void QTraceWindowSurface::beginPaint(const QRegion &rgn)

{

    // ensure paint buffer is created

    paintDevice();

    buffer->beginNewFrame();

    QRasterWindowSurface::beginPaint(rgn);

}

void QTraceWindowSurface::endPaint(const QRegion &rgn)

{

    QPainter p(QRasterWindowSurface::paintDevice());

    buffer->draw(&p, buffer->numFrames()-1);

    p.end();

    winId = (qulonglong)window()->winId();

    updates << rgn;

    QRasterWindowSurface::endPaint(rgn);

}

bool QTraceWindowSurface::scroll(const QRegion &, int, int)

{

    // TODO: scrolling should also be streamed and replayed

    // to test scrolling performance

    return false;

}

QTraceGraphicsSystem::QTraceGraphicsSystem()

{

}

QPixmapData *QTraceGraphicsSystem::createPixmapData(QPixmapData::PixelType type) const

{

    return new QRasterPixmapData(type);

}

QWindowSurface *QTraceGraphicsSystem::createWindowSurface(QWidget *widget) const

{

    return new QTraceWindowSurface(widget);

}

QT_END_NAMESPACE