<html> <h1>Example for composition modes</h1> <p> This example shows some of the more advanced composition modes supported by Qt. </p> <p> 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. </p> <p> 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. </p> </html>