Size sz = GetSize();    //size of painting area of window
	if(ctrl.transparent) {  //this will create the color chessboard background if you tick that checkbox in app, otherwise the background is white
		for(int y = 0; y < sz.cy; y += 32)
			for(int x = 0; x < sz.cx; x += 32)
				w.DrawRect(x, y, 32, 32, (x ^ y) & 32 ? Color(254, 172, 120) : Color(124, 135, 253));
		//notice it's drawn into the old Draw thing without new Painter
	}
	ImageBuffer ib(sz);   //this is raw RGBA memory array for SW rendering (allocating the "canvas" for Painter)

//here's the Painter class finally - BufferPainter is nothing more than
//Painter class extended to paint into ImageBuffer, which was created a line above
	BufferPainter sw(ib, ctrl.quality);  //init it with desired ImageBuffer and desired antialiasing mode (from GUI control)
	DoPaint(sw);   //some custom function which does the actual drawing and I didn't bother to look inside
//of course just go on the DoPaint with cursor and hit Alt+J to see what's there, if you are curious enough
//but basically you just need to do sw.drawEllipse, etc.. as you wish     

	w.DrawImage(0, 0, ib);
//and the resulting SW rendered RGBA image is rendered back to OS's window area represented by the original Draw& w instance.