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<b>Warning</b>:  session_start(): Failed to read session data: files (path: /var/lib/php/sessions) in <b>/var/www/tb-usercake/models/config.php</b> on line <b>51</b><br />
static ImageSurface ImageSurfaceCheckerBoardBackground(ImageSurface is) {
  if (is.drawBackground != null) ret is;
  is.drawBackground = (w, h, g) -> {
    va rcb = new CheckerBoard2().w(w).h(h);
    double time = sysSeconds();
    cb.shiftX(iround(time*8));
    cb.shiftY(iround(time*8));
    cb.drawOn(g);
  };
  setDoubleBuffered(is);
  repaintEvery(100, is);
  ret is;
}