surface_test.py 文件源码

def test_subsurface(self):
        # Blitting a surface to its subsurface is allowed.
        surf = self._make_surface(32, srcalpha=True)
        comp = surf.copy()
        comp.blit(surf, (3, 0))
        sub = surf.subsurface((3, 0, 6, 6))
        sub.blit(surf, (0, 0))
        del sub
        self._assert_same(surf, comp)
        # Blitting a subsurface to its owner is forbidden because of
        # lock conficts. This limitation allows the overlap check
        # in PySurface_Blit of alphablit.c to be simplified.
        def do_blit(d, s):
            d.blit(s, (0, 0))
        sub = surf.subsurface((1, 1, 2, 2))
        self.failUnlessRaises(pygame.error, do_blit, surf, sub)