image_test.py 文件源码

def test_save(self):

        s = pygame.Surface((10,10))
        s.fill((23,23,23))
        magic_hex = {}
        magic_hex['jpg'] = [0xff, 0xd8, 0xff, 0xe0]
        magic_hex['png'] = [0x89 ,0x50 ,0x4e ,0x47]
        magic_hex['tga'] = [0x0, 0x0, 0xa]
        magic_hex['bmp'] = [0x42, 0x4d]


        formats = ["jpg", "png", "tga", "bmp"]
        # uppercase too... JPG
        formats = formats + [x.upper() for x in formats]

        for fmt in formats:
            try:
                temp_filename = "%s.%s" % ("tmpimg", fmt)
                pygame.image.save(s, temp_filename)
                # test the magic numbers at the start of the file to ensure they are saved 
                #   as the correct file type.
                self.assertEqual((1, fmt), (test_magic(open(temp_filename, "rb"), magic_hex[fmt.lower()]), fmt))
                # load the file to make sure it was saved correctly.  
                #    Note load can load a jpg saved with a .png file name.
                s2 = pygame.image.load(temp_filename)
                #compare contents, might only work reliably for png... 
                #   but because it's all one color it seems to work with jpg.
                self.assertEquals(s2.get_at((0,0)), s.get_at((0,0)))
            finally:
                #clean up the temp file, comment out to leave tmp file after run.
                os.remove(temp_filename)
                pass