source: trunk/src/gui/painting/qgraphicssystem_runtime.cpp@ 936

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** This file is part of the QtGui module of the Qt Toolkit.
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** Foundation and appearing in the file LICENSE.LGPL included in the
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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)