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The class is adapted from a demo tool for Blending Modes written by Romain Guy (romainguy@android.com). The tool is available at http://www.curious-creature.org/2006/09/20/new-blendings-modes-for-java2d/ Change-Id: I8f7c7ca08d3078106056764a4e2f1ce95d990137 (cherry picked from commit 882e08759137a77090c3c7dff8cba425a3393474)