Computing the combined color of two colors (Over operator)

Question

This is for an Android application. Let\'s say that I have two colors with alpha

int color1 = 0x12345678  // aarrggbb
int color2 = 0x87654321

Answer 1

It's part of the Java Advanced Imaging API:

http://download.java.net/media/jai/javadoc/1.1.3/jai-apidocs/javax/media/jai/operator/CompositeDescriptor.html

http://www.oracle.com/technetwork/java/current-142188.html