png.py 文件源码

def testPAMin(self):
        """Test that the command line tool can read PAM file."""
        def do():
            return _main(['testPAMin'])
        s = BytesIO()
        s.write(strtobytes('P7\nWIDTH 3\nHEIGHT 1\nDEPTH 4\nMAXVAL 255\n'
                'TUPLTYPE RGB_ALPHA\nENDHDR\n'))
        # The pixels in flat row flat pixel format
        flat =  [255,0,0,255, 0,255,0,120, 0,0,255,30]
        asbytes = seqtobytes(flat)
        s.write(asbytes)
        s.flush()
        s.seek(0)
        o = BytesIO()
        testWithIO(s, o, do)
        r = Reader(bytes=o.getvalue())
        x,y,pixels,meta = r.read()
        self.assertTrue(r.alpha)
        self.assertTrue(not r.greyscale)
        self.assertEqual(list(itertools.chain(*pixels)), flat)