import unittest

import pygame
from pygame.locals import *

class BlitTest( unittest.TestCase ):
    def test_SRCALPHA( self ):
        """ SRCALPHA tests.
        """
        #blend(s, 0, d) = d
        s = pygame.Surface((1,1), SRCALPHA, 32)
        s.fill((255, 255,255, 0))

        d = pygame.Surface((1,1), SRCALPHA, 32)
        d.fill((0, 0,255, 255))

        s.blit(d, (0,0))
        self.assertEqual(s.get_at((0,0)), d.get_at((0,0)) )

        #blend(s, 255, d) = s
        s = pygame.Surface((1,1), SRCALPHA, 32)
        s.fill((123, 0, 0, 255))
        s1 = pygame.Surface((1,1), SRCALPHA, 32)
        s1.fill((123, 0, 0, 255))
        d = pygame.Surface((1,1), SRCALPHA, 32)
        d.fill((10, 0,0, 0))
        s.blit(d, (0,0))
        self.assertEqual(s.get_at((0,0)), s1.get_at((0,0)) )

        #TODO: these should be true too.
        #blend(0, sA, 0) = 0
        #blend(255, sA, 255) = 255
        #blend(s, sA, d) <= 255

    def test_BLEND( self ):
        """ BLEND_ tests.
        """

        #test that it doesn't overflow, and that it is saturated.
        s = pygame.Surface((1,1), SRCALPHA, 32)
        s.fill((255, 255,255, 0))

        d = pygame.Surface((1,1), SRCALPHA, 32)
        d.fill((0, 0,255, 255))

        s.blit(d, (0,0), None, BLEND_ADD)

        #print "d %s" % (d.get_at((0,0)),)
        #print s.get_at((0,0))
        #self.assertEqual(s.get_at((0,0))[2], 255 )
        #self.assertEqual(s.get_at((0,0))[3], 0 )



        s.blit(d, (0,0), None, BLEND_RGBA_ADD)
        #print s.get_at((0,0))
        self.assertEqual(s.get_at((0,0))[3], 255 )


        # test adding works.
        s.fill((20, 255,255, 0))
        d.fill((10, 0,255, 255))
        s.blit(d, (0,0), None, BLEND_ADD)
        self.assertEqual(s.get_at((0,0))[2], 255 )

        # test subbing works.
        s.fill((20, 255,255, 0))
        d.fill((10, 0,255, 255))
        s.blit(d, (0,0), None, BLEND_SUB)
        self.assertEqual(s.get_at((0,0))[0], 10 )

        # no overflow in sub blend.
        s.fill((20, 255,255, 0))
        d.fill((30, 0,255, 255))
        s.blit(d, (0,0), None, BLEND_SUB)
        self.assertEqual(s.get_at((0,0))[0], 0 )


    def make_blit_list(self, num_surfs):

        blit_list = []
        for i in range(num_surfs):
            dest = (i * 10, 0)
            surf = pygame.Surface((10, 10), SRCALPHA, 32)
            color = (i * 1, i * 1, i * 1)
            surf.fill(color)
            blit_list.append((surf, dest))
        return blit_list

    def test_blits(self):

        NUM_SURFS = 255
        PRINT_TIMING = 0
        dst = pygame.Surface((NUM_SURFS * 10, 10), SRCALPHA, 32)
        dst.fill((230, 230, 230))
        blit_list = self.make_blit_list(NUM_SURFS)

        def blits(blit_list):
            for surface, dest in blit_list:
                dst.blit(surface, dest)

        from time import time
        t0 = time()
        results = blits(blit_list)
        t1 = time()
        if PRINT_TIMING:
            print("python blits: %s" % (t1-t0))

        dst.fill((230, 230, 230))
        t0 = time()
        results = dst.blits(blit_list)
        t1 = time()
        if PRINT_TIMING:
            print("Surface.blits :%s" % (t1-t0))


        # check if we blit all the different colors in the correct spots.
        for i in range(NUM_SURFS):
            color = (i * 1, i * 1, i * 1)
            self.assertEqual(dst.get_at((i * 10, 0)), color)
            self.assertEqual(dst.get_at(((i * 10) + 5, 5)), color)

        self.assertEqual(len(results), NUM_SURFS)

        t0 = time()
        results = dst.blits(blit_list, doreturn = 0)
        t1 = time()
        if PRINT_TIMING:
            print("Surface.blits doreturn=0: %s" % (t1-t0))
        self.assertEqual(results, None)


        t0 = time()
        results = dst.blits(((surf, dest) for surf, dest in blit_list))
        t1 = time()
        if PRINT_TIMING:
            print("Surface.blits generator: %s" % (t1-t0))


    def test_blits_not_sequence(self):
        dst = pygame.Surface((100, 10), SRCALPHA, 32)
        self.assertRaises(ValueError, dst.blits, None)

    def test_blits_wrong_length(self):
        dst = pygame.Surface((100, 10), SRCALPHA, 32)
        self.assertRaises(ValueError, dst.blits, [pygame.Surface((10, 10), SRCALPHA, 32)])

    def test_blits_bad_surf_args(self):
        dst = pygame.Surface((100, 10), SRCALPHA, 32)
        self.assertRaises(TypeError, dst.blits, [(None, None)])

    def test_blits_bad_dest(self):
        dst = pygame.Surface((100, 10), SRCALPHA, 32)
        self.assertRaises(TypeError, dst.blits, [(pygame.Surface((10, 10), SRCALPHA, 32), None)])



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