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Speed up rotating square images by 90 or 270 degrees

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This commit is contained in:
Andrew Murray 2021-07-30 19:57:09 +10:00
parent 6cb127c8cd
commit 438c3cc097
2 changed files with 5 additions and 4 deletions
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3
Tests/test_image_rotate.py
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@ -33,6 +33,9 @@ def test_angle():
with Image.open("Tests/images/test-card.png") as im: with Image.open("Tests/images/test-card.png") as im:
rotate(im, im.mode, angle) rotate(im, im.mode, angle)
im = hopper()
assert_image_equal(im.rotate(angle), im.rotate(angle, expand=1))
def test_zero(): def test_zero():
for angle in (0, 45, 90, 180, 270): for angle in (0, 45, 90, 180, 270):

6
src/PIL/Image.py
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@ -2074,10 +2074,8 @@ class Image:
return self.copy() return self.copy()
if angle == 180: if angle == 180:
return self.transpose(ROTATE_180) return self.transpose(ROTATE_180)
if angle == 90 and expand: if angle in (90, 270) and (expand or self.width == self.height):
return self.transpose(ROTATE_90) return self.transpose(ROTATE_90 if angle == 90 else ROTATE_270)
if angle == 270 and expand:
return self.transpose(ROTATE_270)
# Calculate the affine matrix. Note that this is the reverse # Calculate the affine matrix. Note that this is the reverse
# transformation (from destination image to source) because we # transformation (from destination image to source) because we