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