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QPixmap ImageS, ImageD;
bool repaintS, repaintD;
void PaintS(QPainter *painter) {/*...*/}
void PaintD(QPainter *painter) {/*...*/}
void paintEvent(QPaintEvent *)
{
   QPainter *painter;
   painter = new QPainter(this);
   PaintAll(painter);
   delete painter;
}
void PaintAll(QPainter *painter)
{
   if (repaintS)
   {
      repaintS = false;
      ImageS = QPixmap(W, H);
      ImageS.fill(Qt::transparent);
      QPainter painterS(&ImageS);
      PaintS(&painterS);
   }
   if (repaintD)
   {
      repaintD = false;
      ImageD = QPixmap(W, H);
      ImageD.fill(Qt::transparent);
      QPainter painterD(&ImageD);
      PaintD(&painterD);
   }
   painter->drawPixmap(X, Y, ImageS);
   painter->drawPixmap(X, Y, ImageD);
}

QPalette pal = palette();
pal.setBrush(QPalette::Window, QBrush(ImageS));
setPalette(pal);

QLabel *LabelBackGround;
LabelBackGround->setPixmap(ImageS);

//painter->drawPixmap(X, Y, ImageS);

ImageD = ImageS;
//
painter->drawPixmap(X, Y, ImageS);
//painter->drawPixmap(X, Y, ImageD);

   if (repaintD)
   {
      repaintD = false;
      ImageD = QPixmap(W, H);
      ImageD.fill(Qt::transparent);
      QPainter painterD(&ImageD);
      PaintD(&painterD);
   }
   painter->drawPixmap(X, Y, ImageS);
   painter->drawPixmap(X, Y, ImageD);

   if (repaintD)
   {
      repaintD = false;
      ImageD = ImageS;
      QPainter painterD(&ImageD);
      PaintD(&painterD);
   }
   //painter->drawPixmap(X, Y, ImageS);
   painter->drawPixmap(X, Y, ImageD);