Double buffer with GDI

gdi-double-buffer.cpp

void CLab1View::OnDraw(CDC* pDC)
{
	CLab1Doc* pDoc = GetDocument();
	ASSERT_VALID(pDoc);
	if (!pDoc)
		return;

	// Setup coordinate system
	GetClientRect(&clientRect);
	pDC->SetMapMode(MM_ISOTROPIC);
	pDC->SetWindowExt(clientRect.right, clientRect.bottom);
	pDC->SetViewportExt(clientRect.right, clientRect.bottom);
	pDC->SetWindowOrg(0, 0);

	bufferDC.DeleteDC();
	bufferDC.CreateCompatibleDC(pDC);

	// Create buffer
	bufferBmp.DeleteObject();
	bufferBmp.CreateCompatibleBitmap(pDC, clientRect.right, clientRect.bottom);
	bufferDC.SelectObject(&bufferBmp);

	// Draw something here

	AdjustBitmap(&bufferBmp, brightness, contrast); // Optional filter
	pDC->BitBlt(0, 0, clientRect.right, clientRect.bottom, &bufferDC, 0, 0, SRCCOPY);
}