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Merge pull request #4726 from hugovk/fix-png-disposal-comparison-bug

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APNG: Fix setting disposal
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Andrew Murray 2020-06-30 00:01:15 +10:00 committed by GitHub
commit 4cf7c562e4
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2 changed files with 21 additions and 1 deletions
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20
Tests/test_file_apng.py
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@ -494,6 +494,26 @@ def test_apng_save_disposal(tmp_path):
assert im.getpixel((64, 32)) == (0, 255, 0, 255)
def test_apng_save_disposal_previous(tmp_path):
test_file = str(tmp_path / "temp.png")
size = (128, 64)
transparent = Image.new("RGBA", size, (0, 0, 0, 0))
red = Image.new("RGBA", size, (255, 0, 0, 255))
green = Image.new("RGBA", size, (0, 255, 0, 255))
# test APNG_DISPOSE_OP_NONE
transparent.save(
test_file,
save_all=True,
append_images=[red, green],
disposal=PngImagePlugin.APNG_DISPOSE_OP_PREVIOUS,
)
with Image.open(test_file) as im:
im.seek(2)
assert im.getpixel((0, 0)) == (0, 255, 0, 255)
assert im.getpixel((64, 32)) == (0, 255, 0, 255)
def test_apng_save_blend(tmp_path):
test_file = str(tmp_path / "temp.png")
size = (128, 64)

2
src/PIL/PngImagePlugin.py
View File

@ -1038,7 +1038,7 @@ def _write_multiple_frames(im, fp, chunk, rawmode):
prev_disposal = previous["encoderinfo"].get("disposal")
prev_blend = previous["encoderinfo"].get("blend")
if prev_disposal == APNG_DISPOSE_OP_PREVIOUS and len(im_frames) < 2:
prev_disposal == APNG_DISPOSE_OP_BACKGROUND
prev_disposal = APNG_DISPOSE_OP_BACKGROUND
if prev_disposal == APNG_DISPOSE_OP_BACKGROUND:
base_im = previous["im"]