CFastImage::CFastImage(QWidget* parent)
 : QWidget(parent)
{
m_data=NULL;
     setAttribute( Qt::WA_PaintOnScreen, true);
     startTimer( 20);
}

CFastImage::~CFastImage()
{
if(m_data!=NULL) delete[] m_data;
}

void CFastImage::timerEvent(QTimerEvent*)
{
update();
}

void CFastImage::paintEvent(QPaintEvent* p)
{
    // just for illustration purposes. You get the same effect if you leave the paint event completely empty, too.
    QWidget::paintEvent(p);

BITMAPINFO BMP;
BMP.bmiHeader.biWidth=width;
BMP.bmiHeader.biHeight=height;
BMP.bmiHeader.biBitCount=24;

BMP.bmiHeader.biSize = sizeof (BITMAPINFOHEADER);
BMP.bmiHeader.biPlanes = 1;
BMP.bmiHeader.biCompression = BI_RGB;
BMP.bmiHeader.biSizeImage = ( ( BMP.bmiHeader.biWidth * ( BMP.bmiHeader.biBitCount >> 3 ) + 3 ) & - 4 ) * BMP.bmiHeader.biHeight;

HDC hdc = GetDC(winId());

    SetStretchBltMode( hdc, COLORONCOLOR );

StretchDIBits ( hdc , 0 , 0 , width , height , 0 , 0 , width , height , m_data , &BMP , DIB_RGB_COLORS , SRCCOPY );

    ReleaseDC(winId(), hdc);
}

QPaintEngine* CFastImage::paintEngine() const
{
     return 0;
}

#ifndef _FAST_IMAGE_H_
#define _FAST_IMAGE_H_

class CFastImage : public QWidget
{
public:
   CFastImage(QWidget* parent = NULL);
   ~CFastImage();
public:
   virtual void timerEvent(QTimerEvent*);
   void paintEvent(QPaintEvent* p);
   QPaintEngine *paintEngine() const;
public:
unsigned char* m_data;
int width;
int height;
};

#endif //_FAST_IMAGE_H_