ImageViewport Uses viewport content as the texture  Example blend file included

capsize Set/get the maximum size of the source image

filter Set the image filter

flip Set/get whether or not the image is flipped vertically

image Returns the image data

materialID Returns the material ID number

position Get/set the starting position of the bottom left corner of the viewport that is displayed on the texture

refresh Update the image

scale Activates nearest scaling algorithm.

size Returns the source image size

whole Get/set whether or not the whole viewport is used