Distortion Field

This function basically mixes all the pixels in an area of an image, defined by a mask image. The result is much like the invisibility effect used in the movie "The Predator", very cool if you want a small, quick function for that effect in your games! (It looks like the Predator is made of water or something) The image doesn't quite reproduce the effect, I just used PrintScreen 3 times, that's all. It has about 100 frames per second in the real code ;)