dupeguru/core_pe/tests/block_test.py

# Created By: Virgil Dupras
# Created On: 2006/09/01
# Copyright 2011 Hardcoded Software (http://www.hardcoded.net)
# 
# This software is licensed under the "BSD" License as described in the "LICENSE" file, 
# which should be included with this package. The terms are also available at 
# http://www.hardcoded.net/licenses/bsd_license
# The commented out tests are tests for function that have been converted to pure C for speed

from pytest import raises, skip
from hscommon.testutil import eq_

try:
    from ..block import *
except ImportError:
    skip("Can't import the block module, probably hasn't been compiled.")

def my_avgdiff(first, second, limit=768, min_iter=3): # this is so I don't have to re-write every call
    return avgdiff(first, second, limit, min_iter)

BLACK = (0,0,0)
RED = (0xff,0,0)
GREEN = (0,0xff,0)
BLUE = (0,0,0xff)

class FakeImage:
    def __init__(self, size, data):
        self.size = size
        self.data = data
        
    def getdata(self):
        return self.data
    
    def crop(self, box):
        pixels = []
        for i in range(box[1], box[3]):
            for j in range(box[0], box[2]):
                pixel = self.data[i * self.size[0] + j]
                pixels.append(pixel)
        return FakeImage((box[2] - box[0], box[3] - box[1]), pixels)

def empty():
    return FakeImage((0,0), [])

def single_pixel(): #one red pixel
    return FakeImage((1, 1), [(0xff,0,0)])

def four_pixels():
    pixels = [RED,(0,0x80,0xff),(0x80,0,0),(0,0x40,0x80)]
    return FakeImage((2, 2), pixels)

class TestCasegetblock:
    def test_single_pixel(self):
        im = single_pixel()
        [b] = getblocks2(im, 1)
        eq_(RED,b)
    
    def test_no_pixel(self):
        im = empty()
        eq_([], getblocks2(im, 1))
    
    def test_four_pixels(self):
        im = four_pixels()
        [b] = getblocks2(im, 1)
        meanred = (0xff + 0x80) // 4
        meangreen = (0x80 + 0x40) // 4
        meanblue = (0xff + 0x80) // 4
        eq_((meanred,meangreen,meanblue),b)
    

# class TCdiff(unittest.TestCase):
#     def test_diff(self):
#         b1 = (10, 20, 30)
#         b2 = (1, 2, 3)
#         eq_(9 + 18 + 27,diff(b1,b2))
#     
#     def test_diff_negative(self):
#         b1 = (10, 20, 30)
#         b2 = (1, 2, 3)
#         eq_(9 + 18 + 27,diff(b2,b1))
#     
#     def test_diff_mixed_positive_and_negative(self):
#         b1 = (1, 5, 10)
#         b2 = (10, 1, 15)
#         eq_(9 + 4 + 5,diff(b1,b2))
#     

# class TCgetblocks(unittest.TestCase):
#     def test_empty_image(self):
#         im = empty()
#         blocks = getblocks(im,1)
#         eq_(0,len(blocks))
#         
#     def test_one_block_image(self):
#         im = four_pixels()
#         blocks = getblocks2(im, 1)
#         eq_(1,len(blocks))
#         block = blocks[0]
#         meanred = (0xff + 0x80) // 4
#         meangreen = (0x80 + 0x40) // 4
#         meanblue = (0xff + 0x80) // 4
#         eq_((meanred,meangreen,meanblue),block)
#     
#     def test_not_enough_height_to_fit_a_block(self):
#         im = FakeImage((2,1), [BLACK, BLACK])
#         blocks = getblocks(im,2)
#         eq_(0,len(blocks))
#     
#     def xtest_dont_include_leftovers(self):
#         # this test is disabled because getblocks is not used and getblock in cdeffed
#         pixels = [
#             RED,(0,0x80,0xff),BLACK,
#             (0x80,0,0),(0,0x40,0x80),BLACK,
#             BLACK,BLACK,BLACK
#         ]
#         im = FakeImage((3,3), pixels)
#         blocks = getblocks(im,2)
#         block = blocks[0]
#         #Because the block is smaller than the image, only blocksize must be considered.
#         meanred = (0xff + 0x80) // 4
#         meangreen = (0x80 + 0x40) // 4
#         meanblue = (0xff + 0x80) // 4
#         eq_((meanred,meangreen,meanblue),block)
#     
#     def xtest_two_blocks(self):
#         # this test is disabled because getblocks is not used and getblock in cdeffed
#         pixels = [BLACK for i in xrange(4 * 2)]
#         pixels[0] = RED
#         pixels[1] = (0,0x80,0xff)
#         pixels[4] = (0x80,0,0)
#         pixels[5] = (0,0x40,0x80)
#         im = FakeImage((4, 2), pixels)
#         blocks = getblocks(im,2)
#         eq_(2,len(blocks))
#         block = blocks[0]
#         #Because the block is smaller than the image, only blocksize must be considered.
#         meanred = (0xff + 0x80) // 4
#         meangreen = (0x80 + 0x40) // 4
#         meanblue = (0xff + 0x80) // 4
#         eq_((meanred,meangreen,meanblue),block)
#         eq_(BLACK,blocks[1])
#     
#     def test_four_blocks(self):
#         pixels = [BLACK for i in xrange(4 * 4)]
#         pixels[0] = RED
#         pixels[1] = (0,0x80,0xff)
#         pixels[4] = (0x80,0,0)
#         pixels[5] = (0,0x40,0x80)
#         im = FakeImage((4, 4), pixels)
#         blocks = getblocks2(im, 2)
#         eq_(4,len(blocks))
#         block = blocks[0]
#         #Because the block is smaller than the image, only blocksize must be considered.
#         meanred = (0xff + 0x80) // 4
#         meangreen = (0x80 + 0x40) // 4
#         meanblue = (0xff + 0x80) // 4
#         eq_((meanred,meangreen,meanblue),block)
#         eq_(BLACK,blocks[1])
#         eq_(BLACK,blocks[2])
#         eq_(BLACK,blocks[3])
#     

class TestCasegetblocks2:
    def test_empty_image(self):
        im = empty()
        blocks = getblocks2(im,1)
        eq_(0,len(blocks))
    
    def test_one_block_image(self):
        im = four_pixels()
        blocks = getblocks2(im,1)
        eq_(1,len(blocks))
        block = blocks[0]
        meanred = (0xff + 0x80) // 4
        meangreen = (0x80 + 0x40) // 4
        meanblue = (0xff + 0x80) // 4
        eq_((meanred,meangreen,meanblue),block)
    
    def test_four_blocks_all_black(self):
        im = FakeImage((2, 2), [BLACK, BLACK, BLACK, BLACK])
        blocks = getblocks2(im,2)
        eq_(4,len(blocks))
        for block in blocks:
            eq_(BLACK,block)
    
    def test_two_pixels_image_horizontal(self):
        pixels = [RED,BLUE]
        im = FakeImage((2, 1), pixels)
        blocks = getblocks2(im,2)
        eq_(4,len(blocks))
        eq_(RED,blocks[0])
        eq_(BLUE,blocks[1])
        eq_(RED,blocks[2])
        eq_(BLUE,blocks[3])
    
    def test_two_pixels_image_vertical(self):
        pixels = [RED,BLUE]
        im = FakeImage((1, 2), pixels)
        blocks = getblocks2(im,2)
        eq_(4,len(blocks))
        eq_(RED,blocks[0])
        eq_(RED,blocks[1])
        eq_(BLUE,blocks[2])
        eq_(BLUE,blocks[3])
    

class TestCaseavgdiff:
    def test_empty(self):
        with raises(NoBlocksError):
            my_avgdiff([], [])
    
    def test_two_blocks(self):
        im = empty()
        b1 = (5,10,15)
        b2 = (255,250,245)
        b3 = (0,0,0)
        b4 = (255,0,255)
        blocks1 = [b1,b2]
        blocks2 = [b3,b4]
        expected1 = 5 + 10 + 15
        expected2 = 0 + 250 + 10
        expected = (expected1 + expected2) // 2
        eq_(expected, my_avgdiff(blocks1, blocks2))
    
    def test_blocks_not_the_same_size(self):
        b = (0,0,0)
        with raises(DifferentBlockCountError):
            my_avgdiff([b,b],[b])
    
    def test_first_arg_is_empty_but_not_second(self):
        #Don't return 0 (as when the 2 lists are empty), raise!
        b = (0,0,0)
        with raises(DifferentBlockCountError):
            my_avgdiff([],[b])
    
    def test_limit(self):
        ref = (0,0,0)
        b1 = (10,10,10) #avg 30
        b2 = (20,20,20) #avg 45
        b3 = (30,30,30) #avg 60
        blocks1 = [ref,ref,ref]
        blocks2 = [b1,b2,b3]
        eq_(45,my_avgdiff(blocks1,blocks2,44))
    
    def test_min_iterations(self):
        ref = (0,0,0)
        b1 = (10,10,10) #avg 30
        b2 = (20,20,20) #avg 45
        b3 = (10,10,10) #avg 40
        blocks1 = [ref,ref,ref]
        blocks2 = [b1,b2,b3]
        eq_(40,my_avgdiff(blocks1,blocks2,45 - 1,3))

    # Bah, I don't know why this test fails, but I don't think it matters very much
    # def test_just_over_the_limit(self):
    #     #A score just over the limit might return exactly the limit due to truncating. We should
    #     #ceil() the result in this case.
    #     ref = (0,0,0)
    #     b1 = (10,0,0)
    #     b2 = (11,0,0)
    #     blocks1 = [ref,ref]
    #     blocks2 = [b1,b2]
    #     eq_(11,my_avgdiff(blocks1,blocks2,10))
    # 
    def test_return_at_least_1_at_the_slightest_difference(self):
        ref = (0,0,0)
        b1 = (1,0,0)
        blocks1 = [ref for i in range(250)]
        blocks2 = [ref for i in range(250)]
        blocks2[0] = b1
        eq_(1,my_avgdiff(blocks1,blocks2))
    
    def test_return_0_if_there_is_no_difference(self):
        ref = (0,0,0)
        blocks1 = [ref,ref]
        blocks2 = [ref,ref]
        eq_(0,my_avgdiff(blocks1,blocks2))
    

# class TCmaxdiff(unittest.TestCase):
#     def test_empty(self):
#         self.assertRaises(NoBlocksError,maxdiff,[],[])
#     
#     def test_two_blocks(self):
#         b1 = (5,10,15)
#         b2 = (255,250,245)
#         b3 = (0,0,0)
#         b4 = (255,0,255)
#         blocks1 = [b1,b2]
#         blocks2 = [b3,b4]
#         expected1 = 5 + 10 + 15
#         expected2 = 0 + 250 + 10
#         expected = max(expected1,expected2)
#         eq_(expected,maxdiff(blocks1,blocks2))
#     
#     def test_blocks_not_the_same_size(self):
#         b = (0,0,0)
#         self.assertRaises(DifferentBlockCountError,maxdiff,[b,b],[b])
#     
#     def test_first_arg_is_empty_but_not_second(self):
#         #Don't return 0 (as when the 2 lists are empty), raise!
#         b = (0,0,0)
#         self.assertRaises(DifferentBlockCountError,maxdiff,[],[b])
#     
#     def test_limit(self):
#         b1 = (5,10,15)
#         b2 = (255,250,245)
#         b3 = (0,0,0)
#         b4 = (255,0,255)
#         blocks1 = [b1,b2]
#         blocks2 = [b3,b4]
#         expected1 = 5 + 10 + 15
#         expected2 = 0 + 250 + 10
#         eq_(expected1,maxdiff(blocks1,blocks2,expected1 - 1))
#