def test_resize_bilinear_down_simple_completely_transparent(self):
transparent = Color(255, 255, 255, 0)
img = image_factory([[transparent, transparent], [transparent, transparent]])
img = img.resize(1, 1, resample_algorithm=bilinear)
# testing this because a naive implementation can cause div/0 error
self.assertImage(img, [[Color(0, 0, 0, 0)]])
def test_resize_bilinear_up_simple(self):
img = image_factory([[Red, Blue], [Blue, Green]])
img = img.resize(4, 4, resample_algorithm=bilinear)
self.assertImage(
img,
[[Red, Red, Blue, Blue], [Red, Red, Blue, Blue], [Blue, Blue, Green, Green], [Blue, Blue, Green, Green]],
)
def test_resize_nearest_up(self):
img = image_factory([[Red, Blue], [Blue, Green]])
img = img.resize(4, 4)
self.assertImage(
img,
[[Red, Red, Blue, Blue], [Red, Red, Blue, Blue], [Blue, Blue, Green, Green], [Blue, Blue, Green, Green]],
)
def test_resize_bilinear_down_proportional_transparent(self):
transparent = Color(255, 255, 255, 0)
img = image_factory([[Red, Red, transparent], [Red, Red, transparent], [transparent, transparent, transparent]])
img = img.resize(2, 2, resample_algorithm=bilinear)
# - the alpha values get blended equally.
# - all non-alpha channels get multiplied by their alpha, so the
# transparent pixel does not contribute to the result.
self.assertImage(img, [[Red, Color(255, 0, 0, 64)], [Color(255, 0, 0, 64), Color(255, 0, 0, 16)]])
def test_resize_bilinear_down_simple_transparent(self):
transparent = Color(255, 255, 255, 0)
img = image_factory([[Red, Blue], [Blue, transparent]])
img = img.resize(1, 1, resample_algorithm=bilinear)
# - the alpha values get blended equally.
# - all non-alpha channels get multiplied by their alpha, so the
# transparent pixel does not contribute to the result.
self.assertImage(img, [[Color(85, 0, 170, 191)]])
def test_resize_bilinear_down_simple_completely_transparent(self):
img = image_factory([
[transparent, transparent],
[transparent, transparent],
])
img = img.resize(1, 1, resample_algorithm=bilinear)
# testing this because a naive implementation can cause div/0 error
self.assertImage(img, [[Color(0, 0, 0, 0)]])
def test_resize_bilinear_no_change(self):
img = image_factory([
[Red, Blue],
[Blue, Green],
])
img = img.resize(2, 2, resample_algorithm=bilinear)
self.assertImage(img, [
[Red, Blue],
[Blue, Green],
])
def test_resize_bilinear_no_change(self):
img = image_factory([
[Red, Blue],
[Blue, Green],
])
img = img.resize(2, 2, resample_algorithm=bilinear)
self.assertImage(img, [
[Red, Blue],
[Blue, Green],
])
def test_affine_rotate_bilinear_90(self):
img = image_factory([
[Red, Blue],
[Blue, Blue],
])
img = img.rotate(90, resample_algorithm=bilinear)
self.assertImage(img, [
[Blue, Blue],
[Red, Blue],
])
def test_resize_bilinear_down_simple(self):
img = image_factory([[Red, Blue], [Blue, Green]])
img = img.resize(1, 1, resample_algorithm=bilinear)
self.assertImage(
img,
[
# all the colors blended equally
[Color(64, 32, 128, 255)]
],
)
def test_affine_rotate_nearest_90(self):
img = image_factory([
[Red, Blue],
[Blue, Blue],
])
img = img.rotate(90)
self.assertImage(img, [
[Blue, Blue],
[Red, Blue],
])
def test_affine_rotate_nearest_90(self):
img = image_factory([
[Red, Blue],
[Blue, Blue],
])
img = img.rotate(90)
self.assertImage(img, [
[Blue, Blue],
[Red, Blue],
])
def test_affine_rotate_bilinear_90(self):
img = image_factory([
[Red, Blue],
[Blue, Blue],
])
img = img.rotate(90, resample_algorithm=bilinear)
self.assertImage(img, [
[Blue, Blue],
[Red, Blue],
])
def test_resize_bilinear_down_simple_transparent(self):
img = image_factory([
[Red, Blue],
[Blue, transparent],
])
img = img.resize(1, 1, resample_algorithm=bilinear)
# - the alpha values get blended equally.
# - all non-alpha channels get multiplied by their alpha, so the
# transparent pixel does not contribute to the result.
self.assertImage(img, [[Color(85, 0, 170, 191)]])
def test_resize_nearest_down_transparent(self):
img = image_factory([
[Red, Green, Blue],
[Green, Blue, Red],
[Blue, Red, transparent],
])
img = img.resize(2, 2)
self.assertImage(img, [
[Red, Blue],
[Blue, transparent],
])
def test_resize_bilinear_up_proportional(self):
img = image_factory([[Red, Blue], [Blue, Green]])
img = img.resize(3, 3, resample_algorithm=bilinear)
self.assertImage(
img,
[
[(177, 4, 71, 255), (106, 11, 128, 255), (0, 21, 212, 255)],
[(106, 11, 128, 255), (64, 32, 128, 255), (0, 64, 128, 255)],
[(0, 21, 212, 255), (0, 64, 128, 255), (0, 128, 0, 255)],
],
)
def test_resize_bilinear_down_proportional(self):
img = image_factory([
[Red, Red, Blue],
[Red, Red, Blue],
[Blue, Blue, Blue],
])
img = img.resize(2, 2, resample_algorithm=bilinear)
self.assertImage(img, [
[Red, Color(64, 0, 191, 255)],
[Color(64, 0, 191, 255), Color(16, 0, 239, 255)],
])
def test_resize_nearest_down_transparent(self):
img = image_factory([
[Red, Green, Blue],
[Green, Blue, Red],
[Blue, Red, transparent],
])
img = img.resize(2, 2)
self.assertImage(img, [
[Red, Blue],
[Blue, transparent],
])
def test_resize_bilinear_down_simple(self):
img = image_factory([
[Red, Blue],
[Blue, Green],
])
img = img.resize(1, 1, resample_algorithm=bilinear)
self.assertImage(
img,
[
# all the colors blended equally
[Color(64, 32, 128, 255)]
])
def test_resize_nearest_up(self):
img = image_factory([
[Red, Blue],
[Blue, Green],
])
img = img.resize(4, 4)
self.assertImage(img, [
[Red, Red, Blue, Blue],
[Red, Red, Blue, Blue],
[Blue, Blue, Green, Green],
[Blue, Blue, Green, Green],
])
def test_resize_bilinear_up_simple(self):
img = image_factory([
[Red, Blue],
[Blue, Green],
])
img = img.resize(4, 4, resample_algorithm=bilinear)
self.assertImage(img, [
[Red, Red, Blue, Blue],
[Red, Red, Blue, Blue],
[Blue, Blue, Green, Green],
[Blue, Blue, Green, Green],
])
def test_resize_bilinear_down_proportional(self):
img = image_factory([
[Red, Red, Blue],
[Red, Red, Blue],
[Blue, Blue, Blue],
])
img = img.resize(2, 2, resample_algorithm=bilinear)
self.assertImage(img, [
[Red, Color(64, 0, 191, 255)],
[Color(64, 0, 191, 255),
Color(16, 0, 239, 255)],
])
def test_transparent_background(self):
img = image_factory([
[Red, Red, Blue, Blue],
[Red, Red, Blue, Blue],
[Blue, Blue, Red, Red],
[Blue, Blue, Red, Red],
])
img = img.resize(2, 2, resize_canvas=False)
self.assertImage(img, [
[Red, Blue, transparent, transparent],
[Blue, Red, transparent, transparent],
[transparent, transparent, transparent, transparent],
[transparent, transparent, transparent, transparent],
])
def test_transparent_background(self):
img = image_factory([
[Red, Red, Blue, Blue],
[Red, Red, Blue, Blue],
[Blue, Blue, Red, Red],
[Blue, Blue, Red, Red],
])
img = img.resize(2, 2, resize_canvas=False)
self.assertImage(img, [
[Red, Blue, transparent, transparent],
[Blue, Red, transparent, transparent],
[transparent, transparent, transparent, transparent],
[transparent, transparent, transparent, transparent],
])
def test_resize_bilinear_down_proportional_transparent(self):
img = image_factory([
[Red, Red, transparent],
[Red, Red, transparent],
[transparent, transparent, transparent],
])
img = img.resize(2, 2, resample_algorithm=bilinear)
# - the alpha values get blended equally.
# - all non-alpha channels get multiplied by their alpha, so the
# transparent pixel does not contribute to the result.
self.assertImage(img, [
[Red, Color(255, 0, 0, 64)],
[Color(255, 0, 0, 64), Color(255, 0, 0, 16)],
])
def test_resize_bilinear_up_proportional(self):
img = image_factory([
[Red, Blue],
[Blue, Green],
])
img = img.resize(3, 3, resample_algorithm=bilinear)
self.assertImage(img, [
[
Color(177, 4, 71, 255),
Color(106, 11, 128, 255),
Color(0, 21, 212, 255)
],
[
Color(106, 11, 128, 255),
Color(64, 32, 128, 255),
Color(0, 64, 128, 255)
],
[
Color(0, 21, 212, 255),
Color(0, 64, 128, 255),
Color(0, 128, 0, 255)
],
])
def test_resize_nearest_down(self):
img = image_factory([[Red, Green, Blue], [Green, Blue, Red], [Blue, Red, Green]])
img = img.resize(2, 2)
self.assertImage(img, [[Red, Blue], [Blue, Green]])