message: Get the window transparency and ring animation finished up.
  All set now.
diff: #include <QLabel>
  #include <QDateTime>
  #include <QPoint>
  +#include <QScreen>
  +#include <QDesktopWidget>
  +#include <QPropertyAnimation>
  +
  int main(int argc, char **argv){
  //Setup the application
  QApplication App(argc, argv);
  App.setAttribute(Qt::AA_UseHighDpiPixmaps);
  //Display the OSD
  - QWidget splash(0, Qt::Window | Qt::WindowStaysOnTopHint | Qt::FramelessWindowHint);
  + QLabel splash(0, Qt::Window | Qt::WindowStaysOnTopHint | Qt::X11BypassWindowManagerHint | Qt::NoDropShadowWindowHint);
  splash.setWindowTitle("");
  - splash.setStyleSheet("background: qradialgradient(spread:pad, cx:0.5, cy:0.5, radius:0.5, fx:0.5, fy:0.5, stop:0 transparent, stop:0.52 transparent, stop:0.565 rgba(82, 121, 76, 33), stop:0.65 rgba(159, 235, 148, 64), stop:0.721925 rgba(255, 238, 150, 129), stop:0.77 rgba(255, 128, 128, 204), stop:0.89 rgba(191, 128, 255, 64), stop:1 transparent);");
  - splash.setWindowOpacity(0);
  splash.resize(100,100);
  + QWidget overlay( &splash );
  + overlay.setStyleSheet("margin: 0px; border: none; background: qradialgradient(spread:pad, cx:0.5, cy:0.5, radius:0.5, fx:0.5, fy:0.5, stop:0 rgba(0, 0, 0, 0), stop:0.52 rgba(0, 0, 0, 0), stop:0.565 rgba(82, 121, 76, 33), stop:0.65 rgba(159, 235, 148, 64), stop:0.721925 rgba(255, 238, 150, 129), stop:0.77 rgba(130, 205, 47, 204), stop:0.89 rgba(100, 128, 255, 64), stop:1 rgba(0, 0, 0, 0));");
  + overlay.setGeometry(QRect(0,0,100,100));
  //Make sure it is centered on the current screen
  QPoint center = QCursor::pos();
  splash.move(center.x()-(splash.size().width()/2), center.y()-(splash.size().height()/2));
  + splash.setPixmap(QApplication::screens().at(0)->grabWindow(QApplication::desktop()->winId(), splash.x(), splash.y(), 100,100) );
  splash.show();
  - QDateTime end = QDateTime::currentDateTime().addMSecs(1000);
  - while(QDateTime::currentDateTime() < end){ App.processEvents(); }
  + QPropertyAnimation anim(&splash,"windowOpacity");
  + anim.setDuration(1500);
  + anim.setStartValue(1);
  + anim.setKeyValueAt(0.30, 0); anim.setKeyValueAt(0.31, 1);
  + anim.setKeyValueAt(0.60, 0); anim.setKeyValueAt(0.61, 1);
  + anim.setEndValue(0);
  + anim.start();
  + while(anim.state() != QAbstractAnimation::Stopped){ App.processEvents(); }
  splash.hide();
  return 0;
  }
  