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#include "qrasterwindow.h"

#include <QtGui/private/qpaintdevicewindow_p.h>

#include <QtGui/QBackingStore>

#include <QtGui/QPainter>

QT_BEGIN_NAMESPACE

/*!

  \class QRasterWindow

  \inmodule QtGui

  \since 5.4

  \brief QRasterWindow is a convenience class for using QPainter on a QWindow.

  QRasterWindow is a QWindow with a raster-based, non-OpenGL surface. On top of

  the functionality offered by QWindow, QRasterWindow adds a virtual

  paintEvent() function and the possibility to open a QPainter on itself. The

  underlying paint engine will be the raster one, meaning that all drawing will

  happen on the CPU. For performing accelerated, OpenGL-based drawing, use

  QOpenGLWindow instead.

  Internally the class is thin wrapper for QWindow and QBackingStore

  and is very similar to the \l{Raster Window Example}{Raster Window

  Example} that uses these classes directly.

  \sa QPaintDeviceWindow::paintEvent(), QPaintDeviceWindow::update()

*/

class QRasterWindowPrivate : public QPaintDeviceWindowPrivate

{

    Q_DECLARE_PUBLIC(QRasterWindow)

public:

    void beginPaint(const QRegion &region) override

    {

        Q_Q(QRasterWindow);

        const QSize size = q->size();

        if (backingstore->size() != size) {

            backingstore->resize(size);

            markWindowAsDirty();

        }

        backingstore->beginPaint(region);

    }

    void endPaint() override

    {

        backingstore->endPaint();

    }

    void flush(const QRegion &region) override

    {

        Q_Q(QRasterWindow);

        backingstore->flush(region, q);

    }

    QScopedPointer<QBackingStore> backingstore;

};

/*!

  Constructs a new QRasterWindow with \a parent.

*/

QRasterWindow::QRasterWindow(QWindow *parent)

    : QPaintDeviceWindow(*(new QRasterWindowPrivate), parent)

{

    setSurfaceType(QSurface::RasterSurface);

    d_func()->backingstore.reset(new QBackingStore(this));

}

QRasterWindow::~QRasterWindow()

{

  Q_D(QRasterWindow);

  // Delete backingstore while window is still alive, as it

  // might need to reference the window in the process

  d->backingstore.reset(nullptr);

}

/*!

  \internal

*/

int QRasterWindow::metric(PaintDeviceMetric metric) const

{

    Q_D(const QRasterWindow);

    switch (metric) {

    case PdmDepth:

        return d->backingstore->paintDevice()->depth();

    default:

        break;

    }

    return QPaintDeviceWindow::metric(metric);

}

/*!

  \internal

*/

QPaintDevice *QRasterWindow::redirected(QPoint *) const

{

    Q_D(const QRasterWindow);

    return d->backingstore->paintDevice();

}

QT_END_NAMESPACE

#include "moc_qrasterwindow.cpp"