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+<h1>Demo for composition modes</h1>
+ This demo 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
+ for details.