surface_test.py 文件源码

def test_overlap_check(self):
        # Ensure overlapping blits are properly detected. There are two
        # places where this is done, within SoftBlitPyGame() in alphablit.c
        # and PySurface_Blit() in surface.c. SoftBlitPyGame should catch the
        # per-pixel alpha surface, PySurface_Blit the colorkey and blanket
        # alpha surface. per-pixel alpha and blanket alpha self blits are
        # not properly handled by SDL 1.2.13, so Pygame does them.
        bgc = (0, 0, 0, 255)
        rectc_left = (128, 64, 32, 255)
        rectc_right = (255, 255, 255, 255)
        colors = [(255, 255, 255, 255), (128, 64, 32, 255)]
        overlaps = [(0, 0, 1, 0, (50, 0)),
                    (0, 0, 49, 1, (98, 2)),
                    (0, 0, 49, 49, (98, 98)),
                    (49, 0, 0, 1, (0, 2)),
                    (49, 0, 0, 49, (0, 98))]
        surfs = [pygame.Surface((100, 100), SRCALPHA, 32)]
        surf = pygame.Surface((100, 100), 0, 32)
        surf.set_alpha(255)
        surfs.append(surf)
        surf = pygame.Surface((100, 100), 0, 32)
        surf.set_colorkey((0, 1, 0))
        surfs.append(surf)
        for surf in surfs:
            for s_x, s_y, d_x, d_y, test_posn in overlaps:
                surf.fill(bgc)
                surf.fill(rectc_right, (25, 0, 25, 50))
                surf.fill(rectc_left, (0, 0, 25, 50))
                surf.blit(surf, (d_x, d_y), (s_x, s_y, 50, 50))
                self.failUnlessEqual(surf.get_at(test_posn), rectc_right)