QPainter::CompositionMode_SourceAtop not implemented for direct2d

QPainter &painter; = ...
painter.setCompositionMode( QPainter::CompositionMode_SourceAtop );

This code causes an qWarning and is not executed due to
qtbase\src\plugins\platforms\direct2d\qwindowsdirect2dpaintengine.cpp, l. 394
qWarning("Unsupported composition mode: %d", mode);