import unittest
import platform

from pygame.tests import test_utils
import pygame
import pygame.transform
from pygame.locals import *


def show_image(s, images = []):
    #pygame.display.init()
    size = s.get_rect()[2:]
    screen = pygame.display.set_mode(size)
    screen.blit(s, (0,0))
    pygame.display.flip()
    pygame.event.pump()
    going = True
    idx = 0
    while going:
        events = pygame.event.get()
        for e in events:
            if e.type == QUIT:
                going = False
            if e.type == KEYDOWN:
                if e.key in [K_s, K_a]:
                    if e.key == K_s: idx += 1
                    if e.key == K_a: idx -= 1
                    s = images[idx]
                    screen.blit(s, (0,0))
                    pygame.display.flip()
                    pygame.event.pump()
                elif e.key in [K_ESCAPE]:
                    going = False
    pygame.display.quit()
    pygame.display.init()

def threshold(return_surf, surf, color, threshold = (0,0,0), diff_color = (0,0,0), change_return = True ):
    """ given the color it makes return_surf only have areas with the given colour.
    """

    width, height =surf.get_width(), surf.get_height()

    if change_return:
        return_surf.fill(diff_color)

    try:
        r, g, b = color
    except ValueError:
        r, g, b, a = color


    try:
        tr, tg, tb = color
    except ValueError:
        tr, tg, tb, ta = color



    similar = 0
    for y in xrange(height):
        for x in xrange(width):
            c1 = surf.get_at((x,y))

            if ( (abs(c1[0] - r) < tr) &
                 (abs(c1[1] - g) < tg) &
                 (abs(c1[2] - b) < tb) ):
                # this pixel is within the threshold.
                if change_return:
                    return_surf.set_at((x,y), c1)
                similar += 1
            #else:
            #    print c1, c2


    return similar


class TransformModuleTest( unittest.TestCase ):

    def test_scale__alpha( self ):
        """ see if set_alpha information is kept.
        """

        s = pygame.Surface((32,32))
        s.set_alpha(55)
        self.assertEqual(s.get_alpha(),55)

        s = pygame.Surface((32,32))
        s.set_alpha(55)
        s2 = pygame.transform.scale(s, (64,64))
        s3 = s.copy()
        self.assertEqual(s.get_alpha(),s3.get_alpha())
        self.assertEqual(s.get_alpha(),s2.get_alpha())

    def test_scale__destination( self ):
        """ see if the destination surface can be passed in to use.
        """

        s = pygame.Surface((32,32))
        s2 = pygame.transform.scale(s, (64,64))
        s3 = s2.copy()

        s3 = pygame.transform.scale(s, (64,64), s3)
        pygame.transform.scale(s, (64,64), s2)

        # the wrong size surface is past in.  Should raise an error.
        self.assertRaises(ValueError, pygame.transform.scale, s, (33,64), s3)

        s = pygame.Surface((32,32))
        s2 = pygame.transform.smoothscale(s, (64,64))
        s3 = s2.copy()

        s3 = pygame.transform.smoothscale(s, (64,64), s3)
        pygame.transform.smoothscale(s, (64,64), s2)

        # the wrong size surface is past in.  Should raise an error.
        self.assertRaises(ValueError, pygame.transform.smoothscale, s, (33,64), s3)

    def test_scale__zero_surface_transform(self):
        tmp_surface = pygame.transform.scale(pygame.Surface((128, 128)), (0, 0))
        self.assertEqual(tmp_surface.get_size(), (0, 0))
        tmp_surface = pygame.transform.scale(tmp_surface, (128, 128))
        self.assertEqual(tmp_surface.get_size(), (128, 128))

    def test_threshold__honors_third_surface(self):
        # __doc__ for threshold as of Tue 07/15/2008

        # pygame.transform.threshold(DestSurface, Surface, color, threshold =
        # (0,0,0,0), diff_color = (0,0,0,0), change_return = True, Surface =
        # None): return num_threshold_pixels

        # When given the optional third
        # surface, it would use the colors in that rather than the "color"
        # specified in the function to check against.

        # New in pygame 1.8

        ################################################################
        # Sizes
        (w, h) = size = (32, 32)

        # the original_color is within the threshold of the threshold_color
        threshold = (20, 20, 20, 20)

        original_color = (25,25,25,25)
        threshold_color = (10, 10, 10, 10)

        # Surfaces
        original_surface = pygame.Surface(size, pygame.SRCALPHA, 32)
        dest_surface    = pygame.Surface(size, pygame.SRCALPHA, 32)

        # Third surface is used in lieu of 3rd position arg color
        third_surface   = pygame.Surface(size, pygame.SRCALPHA, 32)

        # Color filling
        original_surface.fill(original_color)
        third_surface.fill(threshold_color)

        ################################################################
        # All pixels for color should be within threshold
        #
        pixels_within_threshold = pygame.transform.threshold (
            dest_surf=None,
            surf=original_surface,
            search_color=threshold_color,
            threshold=threshold,
            set_color=None,
            set_behavior=0
        )

        self.assertEqual(w*h, pixels_within_threshold)

        ################################################################
        # This should respect third_surface colors in place of 3rd arg
        # color Should be the same as: surface.fill(threshold_color)
        # all within threshold

        pixels_within_threshold = pygame.transform.threshold (
            dest_surf=None,
            surf=original_surface,
            search_color=None,
            threshold=threshold,
            set_color=None,
            set_behavior=0,
            search_surf=third_surface,
        )
        self.assertEqual(w*h, pixels_within_threshold)

    def test_threshold_dest_surf_not_change(self):
        """ the pixels within the threshold.

        All pixels not within threshold are changed to set_color.
        So there should be none changed in this test.
        """
        (w, h) = size = (32, 32)
        threshold = (20, 20, 20, 20)
        original_color = (25, 25, 25, 25)
        original_dest_color = (65, 65, 65, 55)
        threshold_color = (10, 10, 10, 10)
        set_color = (255, 10, 10, 10)

        surf = pygame.Surface(size, pygame.SRCALPHA, 32)
        dest_surf = pygame.Surface(size, pygame.SRCALPHA, 32)
        search_surf = pygame.Surface(size, pygame.SRCALPHA, 32)

        surf.fill(original_color)
        search_surf.fill(threshold_color)
        dest_surf.fill(original_dest_color)

        # set_behavior=1, set dest_surface from set_color.
        # all within threshold of third_surface, so no color is set.

        THRESHOLD_BEHAVIOR_FROM_SEARCH_COLOR = 1
        pixels_within_threshold = pygame.transform.threshold(
            dest_surf=dest_surf,
            surf=surf,
            search_color=None,
            threshold=threshold,
            set_color=set_color,
            set_behavior=THRESHOLD_BEHAVIOR_FROM_SEARCH_COLOR,
            search_surf=search_surf,
        )

        # # Return, of pixels within threshold is correct
        self.assertEqual(w*h, pixels_within_threshold)

        # # Size of dest surface is correct
        dest_rect = dest_surf.get_rect()
        dest_size = dest_rect.size
        self.assertEqual(size, dest_size)

        # The color is not the change_color specified for every pixel As all
        # pixels are within threshold

        for pt in test_utils.rect_area_pts(dest_rect):
            self.assertNotEqual(dest_surf.get_at(pt), set_color)
            self.assertEqual(dest_surf.get_at(pt), original_dest_color)

    def test_threshold_dest_surf_all_changed(self):
        """ Lowering the threshold, expecting changed surface
        """

        (w, h) = size = (32, 32)
        threshold = (20, 20, 20, 20)
        original_color = (25, 25, 25, 25)
        original_dest_color = (65, 65, 65, 55)
        threshold_color = (10, 10, 10, 10)
        set_color = (255, 10, 10, 10)

        surf = pygame.Surface(size, pygame.SRCALPHA, 32)
        dest_surf = pygame.Surface(size, pygame.SRCALPHA, 32)
        search_surf = pygame.Surface(size, pygame.SRCALPHA, 32)

        surf.fill(original_color)
        search_surf.fill(threshold_color)
        dest_surf.fill(original_dest_color)

        THRESHOLD_BEHAVIOR_FROM_SEARCH_COLOR = 1
        pixels_within_threshold = pygame.transform.threshold (
            dest_surf,
            surf,
            search_color=None,
            set_color=set_color,
            set_behavior=THRESHOLD_BEHAVIOR_FROM_SEARCH_COLOR,
            search_surf=search_surf,
        )

        self.assertEqual(0, pixels_within_threshold)

        dest_rect = dest_surf.get_rect()
        dest_size = dest_rect.size
        self.assertEqual(size, dest_size)

        # The color is the set_color specified for every pixel As all
        # pixels are not within threshold
        for pt in test_utils.rect_area_pts(dest_rect):
            self.assertEqual(dest_surf.get_at(pt), set_color)

    def test_threshold_count(self):
        """ counts the colors, and not changes them.
        """
        surf_size = (32, 32)
        surf = pygame.Surface(surf_size, pygame.SRCALPHA, 32)
        search_surf = pygame.Surface(surf_size, pygame.SRCALPHA, 32)
        search_color = (55, 55, 55, 255)
        original_color = (10, 10, 10, 255)

        surf.fill(original_color)
        # set 2 pixels to the color we are searching for.
        surf.set_at((0, 0), search_color)
        surf.set_at((12, 5), search_color)

        # There is no destination surface, but we ask to change it.
        #   This should be an error.
        self.assertRaises(TypeError, pygame.transform.threshold,
            None,
            surf,
            search_color)
        # from pygame.transform import THRESHOLD_BEHAVIOR_COUNT
        THRESHOLD_BEHAVIOR_FROM_SEARCH_SURF = 2
        self.assertRaises(TypeError, pygame.transform.threshold,
            None,
            surf,
            search_color,
            set_behavior=THRESHOLD_BEHAVIOR_FROM_SEARCH_SURF)

        THRESHOLD_BEHAVIOR_COUNT = 0
        num_threshold_pixels = pygame.transform.threshold(
            dest_surf=None,
            surf=surf,
            search_color=search_color,
            set_behavior=THRESHOLD_BEHAVIOR_COUNT)
        self.assertEqual(num_threshold_pixels, 2)

    def test_threshold_search_surf(self):
        surf_size = (32, 32)
        surf = pygame.Surface(surf_size, pygame.SRCALPHA, 32)
        search_surf = pygame.Surface(surf_size, pygame.SRCALPHA, 32)
        dest_surf = pygame.Surface(surf_size, pygame.SRCALPHA, 32)

        original_color = (10, 10, 10, 255)
        search_color = (55, 55, 55, 255)

        surf.fill(original_color)
        dest_surf.fill(original_color)
        # set 2 pixels to the color we are searching for.
        surf.set_at((0, 0), search_color)
        surf.set_at((12, 5), search_color)

        search_surf.fill(search_color)

        # We look in the other surface for matching colors.
        #  Change it in dest_surf
        THRESHOLD_BEHAVIOR_FROM_SEARCH_SURF = 2

        # TypeError: if search_surf is used, search_color should be None
        self.assertRaises(TypeError, pygame.transform.threshold,
            dest_surf,
            surf,
            search_color,
            set_behavior=THRESHOLD_BEHAVIOR_FROM_SEARCH_SURF,
            search_surf=search_surf)

        # surf, dest_surf, and search_surf should all be the same size.
        # Check surface sizes are the same size.
        different_sized_surf = pygame.Surface((22, 33), pygame.SRCALPHA, 32)
        self.assertRaises(TypeError, pygame.transform.threshold,
            different_sized_surf,
            surf,
            search_color=None,
            set_color=None,
            set_behavior=THRESHOLD_BEHAVIOR_FROM_SEARCH_SURF,
            search_surf=search_surf)

        self.assertRaises(TypeError, pygame.transform.threshold,
            dest_surf,
            surf,
            search_color=None,
            set_color=None,
            set_behavior=THRESHOLD_BEHAVIOR_FROM_SEARCH_SURF,
            search_surf=different_sized_surf)

        # We look to see if colors in search_surf are in surf.
        num_threshold_pixels = pygame.transform.threshold(
            dest_surf=dest_surf,
            surf=surf,
            search_color=None,
            set_color=None,
            set_behavior=THRESHOLD_BEHAVIOR_FROM_SEARCH_SURF,
            search_surf=search_surf)

        num_pixels_within = 2
        self.assertEqual(num_threshold_pixels, num_pixels_within)

        dest_surf.fill(original_color)
        num_threshold_pixels = pygame.transform.threshold(
            dest_surf,
            surf,
            search_color=None,
            set_color=None,
            set_behavior=THRESHOLD_BEHAVIOR_FROM_SEARCH_SURF,
            search_surf=search_surf,
            inverse_set=True)

        self.assertEqual(num_threshold_pixels, 2)

    def test_threshold_inverse_set(self):
        """ changes the pixels within the threshold, and not outside.
        """
        surf_size = (32, 32)
        _dest_surf = pygame.Surface(surf_size, pygame.SRCALPHA, 32)
        _surf = pygame.Surface(surf_size, pygame.SRCALPHA, 32)

        dest_surf = _dest_surf             # surface we are changing.
        surf = _surf                       # surface we are looking at
        search_color = (55, 55, 55, 255)   # color we are searching for.
        threshold = (0, 0, 0, 0)           # within this distance from search_color.
        set_color = (245, 245, 245, 255)         # color we set.
        inverse_set = 1                    # pixels within threshold are changed to 'set_color'


        original_color = (10, 10, 10, 255)
        surf.fill(original_color)
        # set 2 pixels to the color we are searching for.
        surf.set_at((0, 0), search_color)
        surf.set_at((12, 5), search_color)

        dest_surf.fill(original_color)
        # set 2 pixels to the color we are searching for.
        dest_surf.set_at((0, 0), search_color)
        dest_surf.set_at((12, 5), search_color)


        THRESHOLD_BEHAVIOR_FROM_SEARCH_COLOR = 1
        num_threshold_pixels = pygame.transform.threshold(
            dest_surf,
            surf,
            search_color=search_color,
            threshold=threshold,
            set_color=set_color,
            set_behavior=THRESHOLD_BEHAVIOR_FROM_SEARCH_COLOR,
            inverse_set=1)

        self.assertEqual(num_threshold_pixels, 2)
        # only two pixels changed to diff_color.
        self.assertEqual(dest_surf.get_at((0, 0)), set_color)
        self.assertEqual(dest_surf.get_at((12, 5)), set_color)


        # other pixels should be the same as they were before.
        # We just check one other pixel, not all of them.
        self.assertEqual(dest_surf.get_at((2, 2)), original_color)

#XXX
    def test_threshold_non_src_alpha(self):

        result  = pygame.Surface((10,10))
        s1 = pygame.Surface((10,10))
        s2 = pygame.Surface((10,10))
        s3 = pygame.Surface((10,10))
        s4 = pygame.Surface((10,10))

        x = s1.fill((0, 0, 0))
        s1.set_at((0,0), (32, 20, 0 ))

        x = s2.fill((0,20,0))
        x = s3.fill((0,0,0))
        x = s4.fill((0,0,0))
        s2.set_at((0,0), (33, 21, 0 ))
        s2.set_at((3,0), (63, 61, 0 ))
        s3.set_at((0,0), (112, 31, 0 ))
        s4.set_at((0,0), (11, 31, 0 ))
        s4.set_at((1,1), (12, 31, 0 ))

        self.assertEqual(s1.get_at((0,0)), (32, 20, 0, 255))
        self.assertEqual(s2.get_at((0,0)), (33, 21, 0, 255))
        self.assertEqual((0, 0), (s1.get_flags(), s2.get_flags()))



        similar_color = (255, 255, 255, 255)
        diff_color = (222, 0, 0, 255)
        threshold_color = (20, 20, 20, 255)

        THRESHOLD_BEHAVIOR_FROM_SEARCH_COLOR = 1
        num_threshold_pixels = pygame.transform.threshold(
            dest_surf=result,
            surf=s1,
            search_color=similar_color,
            threshold=threshold_color,
            set_color=diff_color,
            set_behavior=THRESHOLD_BEHAVIOR_FROM_SEARCH_COLOR)
        self.assertEqual(num_threshold_pixels, 0)

        num_threshold_pixels = pygame.transform.threshold(
            dest_surf=result,
            surf=s1,
            search_color=(40, 40, 0),
            threshold=threshold_color,
            set_color=diff_color,
            set_behavior=THRESHOLD_BEHAVIOR_FROM_SEARCH_COLOR)
        self.assertEqual(num_threshold_pixels, 1)


        self.assertEqual(result.get_at((0,0)), diff_color)


    def test_threshold__uneven_colors(self):
        (w,h) = size = (16, 16)

        original_surface = pygame.Surface(size, pygame.SRCALPHA, 32)
        dest_surface    = pygame.Surface(size, pygame.SRCALPHA, 32)

        original_surface.fill(0)

        threshold_color_template = [5, 5, 5, 5]
        threshold_template       = [6, 6, 6, 6]

        ################################################################

        for pos in range(len('rgb')):
            threshold_color = threshold_color_template[:]
            threshold       = threshold_template[:]

            threshold_color[pos] = 45
            threshold[pos] = 50

            pixels_within_threshold = pygame.transform.threshold (
                None,
                original_surface,
                threshold_color,
                threshold,
                set_color=None,
                set_behavior=0
            )

            self.assertEqual(w*h, pixels_within_threshold)

        ################################################################

    def test_threshold_set_behavior2(self):
        """ raises an error when set_behavior=2 and set_color is not None.
        """
        from pygame.transform import threshold
        s1 = pygame.Surface((32,32), SRCALPHA, 32)
        s2 = pygame.Surface((32,32), SRCALPHA, 32)
        THRESHOLD_BEHAVIOR_FROM_SEARCH_SURF = 2
        self.assertRaises(TypeError, threshold,
            dest_surf=s2,
            surf=s1,
            search_color=(30, 30, 30),
            threshold=(11, 11, 11),
            set_color=(255, 0, 0),
            set_behavior=THRESHOLD_BEHAVIOR_FROM_SEARCH_SURF)

    def test_threshold_set_behavior0(self):
        """ raises an error when set_behavior=1
                and set_color is not None,
                and dest_surf is not None.
        """
        from pygame.transform import threshold
        s1 = pygame.Surface((32,32), SRCALPHA, 32)
        s2 = pygame.Surface((32,32), SRCALPHA, 32)
        THRESHOLD_BEHAVIOR_COUNT = 0

        self.assertRaises(TypeError, threshold,
            dest_surf=None,
            surf=s2,
            search_color=(30, 30, 30),
            threshold=(11, 11, 11),
            set_color=(0, 0, 0),
            set_behavior=THRESHOLD_BEHAVIOR_COUNT)

        self.assertRaises(TypeError, threshold,
            dest_surf=s1,
            surf=s2,
            search_color=(30, 30, 30),
            threshold=(11, 11, 11),
            set_color=None,
            set_behavior=THRESHOLD_BEHAVIOR_COUNT)

        threshold(
            dest_surf=None,
            surf=s2,
            search_color=(30, 30, 30),
            threshold=(11, 11, 11),
            set_color=None,
            set_behavior=THRESHOLD_BEHAVIOR_COUNT)


    def test_threshold_from_surface(self):
        """ Set similar pixels in 'dest_surf' to color in the 'surf'.
        """
        from pygame.transform import threshold

        surf = pygame.Surface((32,32), SRCALPHA, 32)
        dest_surf = pygame.Surface((32,32), SRCALPHA, 32)
        surf_color = (40, 40, 40, 255)
        dest_color = (255, 255, 255)
        surf.fill(surf_color)
        dest_surf.fill(dest_color)
        THRESHOLD_BEHAVIOR_FROM_SEARCH_SURF = 2

        num_threshold_pixels = threshold(
            dest_surf=dest_surf,
            surf=surf,
            search_color=(30, 30, 30),
            threshold=(11, 11, 11),
            set_color=None,
            set_behavior=THRESHOLD_BEHAVIOR_FROM_SEARCH_SURF,
            inverse_set=1)

        self.assertEqual(num_threshold_pixels, dest_surf.get_height() * dest_surf.get_width())
        self.assertEqual(dest_surf.get_at((0, 0)), surf_color)


    def test_threshold__surface(self):
        """
        """
        from pygame.transform import threshold

        s1 = pygame.Surface((32,32), SRCALPHA, 32)
        s2 = pygame.Surface((32,32), SRCALPHA, 32)
        s3 = pygame.Surface((1,1), SRCALPHA, 32)
        THRESHOLD_BEHAVIOR_FROM_SEARCH_SURF = 2

        #     # only one pixel should not be changed.
        #     s1.fill((40,40,40))
        #     s2.fill((255,255,255))
        #     s1.set_at( (0,0), (170, 170, 170) )
        #     # set the similar pixels in destination surface to the color
        #     #     in the first surface.
        #     num_threshold_pixels = threshold(
        #         dest_surf=s2,
        #         surf=s1,
        #         search_color=(30,30,30),
        #         threshold=(11,11,11),
        #         set_color=None,
        #         set_behavior=THRESHOLD_BEHAVIOR_FROM_SEARCH_SURF)

        #     #num_threshold_pixels = threshold(s2, s1, (30,30,30))
        #     self.assertEqual(num_threshold_pixels, (s1.get_height() * s1.get_width()) -1)
        #     self.assertEqual(s2.get_at((0,0)), (0,0,0, 255))
        #     self.assertEqual(s2.get_at((0,1)), (40, 40, 40, 255))
        #     self.assertEqual(s2.get_at((17,1)), (40, 40, 40, 255))


        # # abs(40 - 255) < 100
        # #(abs(c1[0] - r) < tr)

        #     s1.fill((160,160,160))
        #     s2.fill((255,255,255))
        #     num_threshold_pixels = threshold(s2, s1, (255,255,255), (100,100,100), (0,0,0), True)

        #     self.assertEqual(num_threshold_pixels, (s1.get_height() * s1.get_width()))


        # only one pixel should not be changed.
        s1.fill((40, 40, 40))
        s1.set_at((0, 0), (170, 170, 170))
        THRESHOLD_BEHAVIOR_COUNT = 0

        num_threshold_pixels = threshold(
            dest_surf=None,
            surf=s1,
            search_color=(30, 30, 30),
            threshold=(11, 11, 11),
            set_color=None,
            set_behavior=THRESHOLD_BEHAVIOR_COUNT)

        #num_threshold_pixels = threshold(s2, s1, (30,30,30))
        self.assertEqual(num_threshold_pixels, (s1.get_height() * s1.get_width()) -1)


        # test end markers.  0, and 255

        # the pixels are different by 1.
        s1.fill((254,254,254))
        s2.fill((255,255,255))
        s3.fill((255,255,255))
        s1.set_at( (0,0), (170, 170, 170) )
        num_threshold_pixels = threshold(None, s1, (254,254,254), (1,1,1),
                                         None, THRESHOLD_BEHAVIOR_COUNT)
        self.assertEqual(num_threshold_pixels, (s1.get_height() * s1.get_width()) -1)


        # compare the two surfaces.  Should be all but one matching.
        num_threshold_pixels = threshold(None, s1, None, (1,1,1),
                                         None, THRESHOLD_BEHAVIOR_COUNT, s2)
        self.assertEqual(num_threshold_pixels, (s1.get_height() * s1.get_width()) -1)


        # within (0,0,0) threshold?  Should match no pixels.
        num_threshold_pixels = threshold(None, s1, (253,253,253), (0,0,0),
                                         None, THRESHOLD_BEHAVIOR_COUNT)
        self.assertEqual(num_threshold_pixels, 0)


        # other surface within (0,0,0) threshold?  Should match no pixels.
        num_threshold_pixels = threshold(None, s1, None, (0,0,0),
                                         None, THRESHOLD_BEHAVIOR_COUNT, s2)
        self.assertEqual(num_threshold_pixels, 0)

    def test_threshold__subclassed_surface(self):
        """Ensure threshold accepts subclassed surfaces."""
        expected_size = (13, 11)
        expected_flags = 0
        expected_depth = 32
        expected_color = (90, 80, 70, 255)
        expected_count = 0
        surface = test_utils.SurfaceSubclass(expected_size, expected_flags,
                                             expected_depth)
        dest_surface = test_utils.SurfaceSubclass(expected_size,
                                                  expected_flags,
                                                  expected_depth)
        search_surface = test_utils.SurfaceSubclass(expected_size,
                                                    expected_flags,
                                                    expected_depth)
        surface.fill((10, 10, 10))
        dest_surface.fill((255, 255, 255))
        search_surface.fill((20, 20, 20))

        count = pygame.transform.threshold(
            dest_surf=dest_surface, surf=surface, threshold=(1, 1, 1),
            set_color=expected_color, search_color=None,
            search_surf=search_surface)

        self.assertIsInstance(dest_surface, pygame.Surface)
        self.assertIsInstance(dest_surface, test_utils.SurfaceSubclass)
        self.assertEqual(count, expected_count)
        self.assertEqual(dest_surface.get_at((0,0)), expected_color)
        self.assertEqual(dest_surface.get_bitsize(), expected_depth)
        self.assertEqual(dest_surface.get_size(), expected_size)
        self.assertEqual(dest_surface.get_flags(), expected_flags)

    def test_laplacian(self):
        """
        """

        SIZE = 32
        s1 = pygame.Surface((SIZE, SIZE))
        s2 = pygame.Surface((SIZE, SIZE))
        s1.fill((10,10,70))
        pygame.draw.line(s1, (255,0,0), (3,10), (20,20))

        # a line at the last row of the image.
        pygame.draw.line(s1, (255,0,0), (0,31), (31,31))


        pygame.transform.laplacian(s1,s2)

        #show_image(s1)
        #show_image(s2)

        self.assertEqual(s2.get_at((0,0)), (0, 0, 0, 255))
        self.assertEqual(s2.get_at((3,10)), (255,0,0,255))
        self.assertEqual(s2.get_at((0,31)), (255,0,0,255))
        self.assertEqual(s2.get_at((31,31)), (255,0,0,255))


        # here we create the return surface.
        s2 = pygame.transform.laplacian(s1)

        self.assertEqual(s2.get_at((0,0)), (0, 0, 0, 255))
        self.assertEqual(s2.get_at((3,10)), (255,0,0,255))
        self.assertEqual(s2.get_at((0,31)), (255,0,0,255))
        self.assertEqual(s2.get_at((31,31)), (255,0,0,255))

    def test_average_surfaces(self):
        """
        """

        SIZE = 32
        s1 = pygame.Surface((SIZE, SIZE))
        s2 = pygame.Surface((SIZE, SIZE))
        s3 = pygame.Surface((SIZE, SIZE))
        s1.fill((10,10,70))
        s2.fill((10,20,70))
        s3.fill((10,130,10))

        surfaces = [s1, s2, s3]
        surfaces = [s1, s2]
        sr = pygame.transform.average_surfaces(surfaces)

        self.assertEqual(sr.get_at((0,0)), (10,15,70,255))


        self.assertRaises(TypeError, pygame.transform.average_surfaces, 1)
        self.assertRaises(TypeError, pygame.transform.average_surfaces, [])

        self.assertRaises(TypeError, pygame.transform.average_surfaces, [1])
        self.assertRaises(TypeError, pygame.transform.average_surfaces, [s1, 1])
        self.assertRaises(TypeError, pygame.transform.average_surfaces, [1, s1])
        self.assertRaises(TypeError, pygame.transform.average_surfaces, [s1, s2, 1])

        self.assertRaises(TypeError, pygame.transform.average_surfaces, (s for s in [s1, s2,s3] ))



    def test_average_surfaces__24(self):

        SIZE = 32
        depth = 24
        s1 = pygame.Surface((SIZE, SIZE), 0, depth)
        s2 = pygame.Surface((SIZE, SIZE), 0, depth)
        s3 = pygame.Surface((SIZE, SIZE), 0, depth)
        s1.fill((10,10,70, 255))
        s2.fill((10,20,70, 255))
        s3.fill((10,130,10, 255))

        surfaces = [s1, s2, s3]
        sr = pygame.transform.average_surfaces(surfaces)
        self.assertEqual( sr.get_masks(), s1.get_masks() )
        self.assertEqual( sr.get_flags(), s1.get_flags() )
        self.assertEqual( sr.get_losses(), s1.get_losses() )

        if 0:
            print ( sr, s1 )
            print ( sr.get_masks(), s1.get_masks() )
            print ( sr.get_flags(), s1.get_flags() )
            print ( sr.get_losses(), s1.get_losses() )
            print ( sr.get_shifts(), s1.get_shifts() )

        self.assertEqual(sr.get_at((0,0)), (10,53,50,255))

    def test_average_surfaces__subclassed_surfaces(self):
        """Ensure average_surfaces accepts subclassed surfaces."""
        expected_size = (23, 17)
        expected_flags = 0
        expected_depth = 32
        expected_color = (50, 50, 50, 255)
        surfaces = []

        for color in ((40, 60, 40), (60, 40, 60)):
            s = test_utils.SurfaceSubclass(expected_size, expected_flags,
                                           expected_depth)
            s.fill(color)
            surfaces.append(s)

        surface = pygame.transform.average_surfaces(surfaces)

        self.assertIsInstance(surface, pygame.Surface)
        self.assertNotIsInstance(surface, test_utils.SurfaceSubclass)
        self.assertEqual(surface.get_at((0,0)), expected_color)
        self.assertEqual(surface.get_bitsize(), expected_depth)
        self.assertEqual(surface.get_size(), expected_size)
        self.assertEqual(surface.get_flags(), expected_flags)

    def test_average_surfaces__subclassed_destination_surface(self):
        """Ensure average_surfaces accepts a destination subclassed surface."""
        expected_size = (13, 27)
        expected_flags = 0
        expected_depth = 32
        expected_color = (15, 15, 15, 255)
        surfaces = []

        for color in ((10, 10, 20), (20, 20, 10), (30, 30, 30)):
            s = test_utils.SurfaceSubclass(expected_size, expected_flags,
                                           expected_depth)
            s.fill(color)
            surfaces.append(s)
        expected_dest_surface = surfaces.pop()

        dest_surface = pygame.transform.average_surfaces(surfaces,
                                                         expected_dest_surface)

        self.assertIsInstance(dest_surface, pygame.Surface)
        self.assertIsInstance(dest_surface, test_utils.SurfaceSubclass)
        self.assertIs(dest_surface, expected_dest_surface)
        self.assertEqual(dest_surface.get_at((0,0)), expected_color)
        self.assertEqual(dest_surface.get_bitsize(), expected_depth)
        self.assertEqual(dest_surface.get_size(), expected_size)
        self.assertEqual(dest_surface.get_flags(), expected_flags)

    def test_average_color(self):
        """
        """

        a = [24, 32]
        for i in a:
            s = pygame.Surface((32,32), 0, i)
            s.fill((0,100,200))
            s.fill((10,50,100), (0,0,16,32))

            self.assertEqual(pygame.transform.average_color(s),(5,75,150,0))
            self.assertEqual(pygame.transform.average_color(s, (16,0,16,32)), (0,100,200,0))

    def todo_test_rotate(self):

        # __doc__ (as of 2008-06-25) for pygame.transform.rotate:

          # pygame.transform.rotate(Surface, angle): return Surface
          # rotate an image

        # color = (128, 128, 128, 255)
        # s = pygame.Surface((3, 3))

        # s.set_at((2, 0), color)

        # self.assertNotEqual(s.get_at((0, 0)), color)
        # s = pygame.transform.rotate(s, 90)
        # self.assertEqual(s.get_at((0, 0)), color)

        self.fail()

    def test_rotate__lossless_at_90_degrees(self):
        w, h = 32, 32
        s = pygame.Surface((w, h), pygame.SRCALPHA)

        gradient = list(test_utils.gradient(w, h))

        for pt, color in gradient: s.set_at(pt, color)

        for rotation in (90, -90):
            s = pygame.transform.rotate(s,rotation)

        for pt, color in gradient:
            self.assertTrue(s.get_at(pt) == color)

    def test_scale2x(self):

        # __doc__ (as of 2008-06-25) for pygame.transform.scale2x:

          # pygame.transform.scale2x(Surface, DestSurface = None): Surface
          # specialized image doubler

        w, h = 32, 32
        s = pygame.Surface((w, h), pygame.SRCALPHA, 32)

        # s.set_at((0,0), (20, 20, 20, 255))

        s2 = pygame.transform.scale2x(s)
        self.assertEqual(s2.get_rect().size, (64, 64))

    def test_get_smoothscale_backend(self):
        filter_type = pygame.transform.get_smoothscale_backend()
        self.assertTrue(filter_type in ['GENERIC', 'MMX', 'SSE'])
        # It would be nice to test if a non-generic type corresponds to an x86
        # processor. But there is no simple test for this. platform.machine()
        # returns process version specific information, like 'i686'.

    def test_set_smoothscale_backend(self):
        # All machines should allow 'GENERIC'.
        original_type = pygame.transform.get_smoothscale_backend()
        pygame.transform.set_smoothscale_backend('GENERIC')
        filter_type = pygame.transform.get_smoothscale_backend()
        self.assertEqual(filter_type, 'GENERIC')
        # All machines should allow returning to original value.
        # Also check that keyword argument works.
        pygame.transform.set_smoothscale_backend(type=original_type)
        # Something invalid.
        def change():
            pygame.transform.set_smoothscale_backend('mmx')
        self.assertRaises(ValueError, change)
        # Invalid argument keyword.
        def change():
            pygame.transform.set_smoothscale_backend(t='GENERIC')
        self.assertRaises(TypeError, change)
        # Invalid argument type.
        def change():
            pygame.transform.set_smoothscale_backend(1)
        self.assertRaises(TypeError, change)
        # Unsupported type, if possible.
        if original_type != 'SSE':
            def change():
                pygame.transform.set_smoothscale_backend('SSE')
            self.assertRaises(ValueError, change)
        # Should be back where we started.
        filter_type = pygame.transform.get_smoothscale_backend()
        self.assertEqual(filter_type, original_type)

    def todo_test_chop(self):

        # __doc__ (as of 2008-08-02) for pygame.transform.chop:

          # pygame.transform.chop(Surface, rect): return Surface
          # gets a copy of an image with an interior area removed
          #
          # Extracts a portion of an image. All vertical and horizontal pixels
          # surrounding the given rectangle area are removed. The corner areas
          # (diagonal to the rect) are then brought together. (The original
          # image is not altered by this operation.)
          #
          # NOTE: If you want a "crop" that returns the part of an image within
          # a rect, you can blit with a rect to a new surface or copy a
          # subsurface.

        self.fail()

    def todo_test_rotozoom(self):

        # __doc__ (as of 2008-08-02) for pygame.transform.rotozoom:

          # pygame.transform.rotozoom(Surface, angle, scale): return Surface
          # filtered scale and rotation
          #
          # This is a combined scale and rotation transform. The resulting
          # Surface will be a filtered 32-bit Surface. The scale argument is a
          # floating point value that will be multiplied by the current
          # resolution. The angle argument is a floating point value that
          # represents the counterclockwise degrees to rotate. A negative
          # rotation angle will rotate clockwise.

        self.fail()

    def todo_test_smoothscale(self):
        # __doc__ (as of 2008-08-02) for pygame.transform.smoothscale:

          # pygame.transform.smoothscale(Surface, (width, height), DestSurface =
          # None): return Surface
          #
          # scale a surface to an arbitrary size smoothly
          #
          # Uses one of two different algorithms for scaling each dimension of
          # the input surface as required.  For shrinkage, the output pixels are
          # area averages of the colors they cover.  For expansion, a bilinear
          # filter is used. For the amd64 and i686 architectures, optimized MMX
          # routines are included and will run much faster than other machine
          # types. The size is a 2 number sequence for (width, height). This
          # function only works for 24-bit or 32-bit surfaces.  An exception
          # will be thrown if the input surface bit depth is less than 24.
          #
          # New in pygame 1.8

        self.fail()


class TransformDisplayModuleTest(unittest.TestCase):

    def setUp(self):
        pygame.display.init()

    def tearDown(self):
        pygame.display.quit()

    def test_flip(self):
        """ honors the set_color key on the returned surface from flip.
        """
        from pygame.tests.test_utils import example_path

        pygame.display.set_mode((320, 200))

        fullname = example_path('data/chimp.bmp')
        image_loaded = pygame.image.load(fullname)

        image = pygame.Surface(image_loaded.get_size(), 0, 32)
        image.blit(image_loaded, (0, 0))

        image_converted = image_loaded.convert()

        self.assertFalse(image.get_flags() & pygame.SRCALPHA)
        self.assertFalse(image_converted.get_flags() & pygame.SRCALPHA)

        surf = pygame.Surface(image.get_size(), 0, 32)
        surf2 = pygame.Surface(image.get_size(), 0, 32)

        surf.fill((255, 255, 255))
        surf2.fill((255, 255, 255))

        colorkey = image.get_at((0,0))
        image.set_colorkey(colorkey, RLEACCEL)
        timage = pygame.transform.flip(image, 1, 0)

        colorkey = image_converted.get_at((0,0))
        image_converted.set_colorkey(colorkey, RLEACCEL)
        timage_converted = pygame.transform.flip(image_converted, 1, 0)

        # blit the flipped surface, and non flipped surface.
        surf.blit(timage, (0, 0))
        surf2.blit(image, (0, 0))

        # the results should be the same.
        self.assertEqual(surf.get_at((0, 0)), surf2.get_at((0, 0)))
        self.assertEqual(surf2.get_at((0, 0)), (255, 255, 255, 255))

        # now we test the convert() ed image also works.
        surf.fill((255, 255, 255))
        surf2.fill((255, 255, 255))
        surf.blit(timage_converted, (0, 0))
        surf2.blit(image_converted, (0, 0))
        self.assertEqual(surf.get_at((0, 0)), surf2.get_at((0, 0)))

    def test_flip_alpha(self):
        """ returns a surface with the same properties as the input.
        """
        from pygame.tests.test_utils import example_path

        pygame.display.set_mode((320, 200))

        fullname = example_path('data/chimp.bmp')
        image_loaded = pygame.image.load(fullname)

        image_alpha = pygame.Surface(image_loaded.get_size(), pygame.SRCALPHA, 32)
        image_alpha.blit(image_loaded, (0, 0))

        surf = pygame.Surface(image_loaded.get_size(), 0, 32)
        surf2 = pygame.Surface(image_loaded.get_size(), 0, 32)

        colorkey = image_alpha.get_at((0,0))
        image_alpha.set_colorkey(colorkey, RLEACCEL)
        timage_alpha = pygame.transform.flip(image_alpha, 1, 0)

        self.assertTrue(image_alpha.get_flags() & pygame.SRCALPHA)
        self.assertTrue(timage_alpha.get_flags() & pygame.SRCALPHA)

        # now we test the alpha image works.
        surf.fill((255, 255, 255))
        surf2.fill((255, 255, 255))
        surf.blit(timage_alpha, (0, 0))
        surf2.blit(image_alpha, (0, 0))
        self.assertEqual(surf.get_at((0, 0)), surf2.get_at((0, 0)))
        self.assertEqual(surf2.get_at((0, 0)), (255, 0, 0, 255))


if __name__ == '__main__':
    unittest.main()
