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<h1>Example for composition modes</h1>
This example shows some of the more advanced composition modes supported by Qt.
The two most common forms of composition are <b>Source</b> and <b>SourceOver</b>.
<b>Source</b> is used to draw opaque objects onto a paint device. In this mode,
each pixel in the source replaces the corresponding pixel in the destination.
In <b>SourceOver</b> composition mode, the source object is transparent and is
drawn on top of the destination.
In addition to these standard modes, Qt defines the complete set of composition
modes as defined by Thomas Porter and Tom Duff. See the <tt>QPainter</tt> documentation