C / C++ / MFC

void CtestView::OnDraw(CDC* pDC)
{
	CtestDoc* pDoc = GetDocument();
	if (!pDoc)
		return;

	CDC offScreenDC;
	CBitmap offScreenBitmap;
	CBitmap * pOldBitmap = NULL;
	CRect clientRect;
	GetClientRect(clientRect);

	// draw to offscreen bitmap for fast looking repaints
	if (offScreenDC.CreateCompatibleDC(pDC))
	{
		if (offScreenBitmap.CreateCompatibleBitmap(
				pDC,
				clientRect.Width(),
				clientRect.Height()
				)
			)
		{
			pOldBitmap = offScreenDC.SelectObject(&offScreenBitmap);
		}
	}

	// paint background
	CBrush brush;
	CBrush *pOldBrush = NULL;
	if (!brush.CreateSolidBrush(RGB(0, 0, 0)))
		return;
	pOldBrush = offScreenDC.SelectObject(&brush);
	offScreenDC.FillRect(clientRect, &brush);

	pDC->BitBlt(
		clientRect.left,
		clientRect.top,
		clientRect.Width(),
		clientRect.Height(),
		&offScreenDC,
		0,
		0,
		SRCCOPY
		);

	// restore
	offScreenDC.SelectObject(pOldBrush);
	offScreenDC.SelectObject(pOldBitmap);
}