pixelarray_test.py 文件源码

def test_pixels_field(self):
        for bpp in [1, 2, 3, 4]:
            sf = pygame.Surface ((11, 7), 0, bpp * 8)
            ar = pygame.PixelArray (sf)
            ar2 = ar[1:,:]
            self.assertEqual (ar2._pixels_address - ar._pixels_address,
                              ar.itemsize)
            ar2 = ar[:,1:]
            self.assertEqual (ar2._pixels_address - ar._pixels_address,
                              ar.strides[1])
            ar2 = ar[::-1,:]
            self.assertEqual (ar2._pixels_address - ar._pixels_address,
                              (ar.shape[0] - 1) * ar.itemsize)
            ar2 = ar[::-2,:]
            self.assertEqual (ar2._pixels_address - ar._pixels_address,
                              (ar.shape[0] - 1) * ar.itemsize)
            ar2 = ar[:,::-1]
            self.assertEqual (ar2._pixels_address - ar._pixels_address,
                              (ar.shape[1] - 1) * ar.strides[1])
            ar3 = ar2[::-1,:]
            self.assertEqual (ar3._pixels_address - ar._pixels_address,
                              (ar.shape[0] - 1) * ar.strides[0] +
                              (ar.shape[1] - 1) * ar.strides[1])
            ar2 = ar[:,::-2]
            self.assertEqual (ar2._pixels_address - ar._pixels_address,
                              (ar.shape[1] - 1) * ar.strides[1])
            ar2 = ar[2::,3::]
            self.assertEqual (ar2._pixels_address - ar._pixels_address,
                              ar.strides[0] * 2 + ar.strides[1] * 3)
            ar2 = ar[2::2,3::4]
            self.assertEqual (ar2._pixels_address - ar._pixels_address,
                              ar.strides[0] * 2 + ar.strides[1] * 3)
            ar2 = ar[9:2:-1,:]
            self.assertEqual (ar2._pixels_address - ar._pixels_address,
                              ar.strides[0] * 9)
            ar2 = ar[:,5:2:-1]
            self.assertEqual (ar2._pixels_address - ar._pixels_address,
                              ar.strides[1] * 5)
            ##? ar2 = ar[:,9:2:-1]