def test_paste_when_location_is_inside_image_4_channels_no_blending_when_source_alpha_is_255(
self):
image_target = Image(img=np.full((10, 10, 4), 30.0, np.uint8))
image_src = Image(img=np.full((1, 1, 4), 255.0, np.uint8))
a = np.sum(image_src.img[0:1, 0:1, 0:3])
image_target.paste(image_src, 0, 0)
b = np.sum(image_target.img[0:1, 0:1, 0:3])
self.assertEquals(a, b) #target changed into source
def test_paste_when_location_is_inside_image_4_channels_blending_works(
self):
image_target = Image(img=np.full((10, 10, 4), 10, np.uint8))
image_src = Image(img=np.full((1, 1, 4), 25, np.uint8))
image_target.paste(image_src, 0, 0)
a = np.sum(image_src.img[0:1, 0:1, 0:3])
b = np.sum(image_target.img[0:1, 0:1, 0:3])
self.assertNotEquals(a, b)
self.assertEquals(b, 33)
def target_image_alpha_becomes_255_after_paste(self):
image_target = Image(img=np.full((5, 5, 4), 10, np.uint8))
max_alpha_before_paste = np.max(image_target.img[:, :, 3])
image_src = Image(img=np.full((1, 1, 4), 25, np.uint8))
image_target.paste(image_src, 0, 0)
max_alpha_after_paste = np.max(image_target.img[:, :, 3])
self.assertEquals(max_alpha_before_paste, 10)
self.assertEquals(max_alpha_after_paste,
255) #I expected it to be as it was before
def test_paste_when_location_is_inside_image_4_target_alpha_does_not_matter(
self):
image_target = Image(img=np.full((10, 10, 4), 10, np.uint8))
image_src = Image(img=np.full((1, 1, 4), 25, np.uint8))
image_target.paste(image_src, 0, 0)
b = np.sum(image_target.img[0:1, 0:1, 0:3])
self.assertEquals(b, 33)
array = np.full((10, 10, 4), 10, np.uint8)
array[:, :, 3] = np.ones((10, 10), np.uint8)
image_target_new = Image(img=array)
image_src_new = Image(img=np.full((1, 1, 4), 25, np.uint8))
image_target_new.paste(image_src_new, 0, 0)
c = np.sum(image_target_new.img[0:1, 0:1, 0:3])
self.assertEquals(c, 33)
self.assertEquals(b, c)
