from functools import reduce

from PIL import Image

def compose(*funcs):
    if funcs:
        return reduce(lambda f, g: lambda *a, **kw: g(f(*a, **kw)), funcs)
    else:
        raise ValueError('Composition of empty sequence not supported.')

def letterbox_image(image, size):
    image_w, image_h = image.size
    w, h = size
    new_w = int(image_w * min(w*1.0/image_w, h*1.0/image_h))
    new_h = int(image_h * min(w*1.0/image_w, h*1.0/image_h))
    resized_image = image.resize((new_w,new_h), Image.BICUBIC)

    boxed_image = Image.new('RGB', size, (128,128,128))
    boxed_image.paste(resized_image, ((w-new_w)//2,(h-new_h)//2))
    return boxed_image