@Override
    protected void deleteNativeBuffers() {
        for (ByteBuffer buf : data) {
            BufferUtils.destroyDirectBuffer(buf);
        }
    }
Determine if the image is NPOT.

@return if the image is a non-power-of-2 image, e.g. having dimensions
that are not powers of 2.
jme3-core/src/main/java/com/jme3/texture/Image.java