from tester import *

from PIL import Image
from PIL import ImageChops

def test_sanity():

    im = lena("L")

    ImageChops.constant(im, 128)
    ImageChops.duplicate(im)
    ImageChops.invert(im)
    ImageChops.lighter(im, im)
    ImageChops.darker(im, im)
    ImageChops.difference(im, im)
    ImageChops.multiply(im, im)
    ImageChops.screen(im, im)

    ImageChops.add(im, im)
    ImageChops.add(im, im, 2.0)
    ImageChops.add(im, im, 2.0, 128)
    ImageChops.subtract(im, im)
    ImageChops.subtract(im, im, 2.0)
    ImageChops.subtract(im, im, 2.0, 128)

    ImageChops.add_modulo(im, im)
    ImageChops.subtract_modulo(im, im)

    ImageChops.blend(im, im, 0.5)
    ImageChops.composite(im, im, im)

    ImageChops.offset(im, 10)
    ImageChops.offset(im, 10, 20)

def test_logical():

    def table(op, a, b):
        out = []
        for x in (a, b):
            imx = Image.new("1", (1, 1), x)
            for y in (a, b):
                imy = Image.new("1", (1, 1), y)
                out.append(op(imx, imy).getpixel((0, 0)))
        return tuple(out)

    assert_equal(table(ImageChops.logical_and, 0, 1), (0, 0, 0, 255))
    assert_equal(table(ImageChops.logical_or, 0, 1), (0, 255, 255, 255))
    assert_equal(table(ImageChops.logical_xor, 0, 1), (0, 255, 255, 0))

    assert_equal(table(ImageChops.logical_and, 0, 128), (0, 0, 0, 255))
    assert_equal(table(ImageChops.logical_or, 0, 128), (0, 255, 255, 255))
    assert_equal(table(ImageChops.logical_xor, 0, 128), (0, 255, 255, 0))

    assert_equal(table(ImageChops.logical_and, 0, 255), (0, 0, 0, 255))
    assert_equal(table(ImageChops.logical_or, 0, 255), (0, 255, 255, 255))
    assert_equal(table(ImageChops.logical_xor, 0, 255), (0, 255, 255, 0))
