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Current delta is determined by previous disposal

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This commit is contained in:
Andrew Murray 2024-02-10 21:33:32 +11:00
parent e6a521130e
commit 430f50606e
2 changed files with 22 additions and 7 deletions
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19
Tests/test_file_gif.py
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@ -737,6 +737,25 @@ def test_dispose2_background_frame(tmp_path: Path) -> None:
assert im.n_frames == 3
def test_dispose2_previous_frame(tmp_path: Path) -> None:
out = str(tmp_path / "temp.gif")
im = Image.new("P", (100, 100))
im.info["transparency"] = 0
d = ImageDraw.Draw(im)
d.rectangle([(0, 0), (100, 50)], 1)
im.putpalette((0, 0, 0, 255, 0, 0))
im2 = Image.new("P", (100, 100))
im2.putpalette((0, 0, 0))
im.save(out, save_all=True, append_images=[im2], disposal=[0, 2])
with Image.open(out) as im:
im.seek(1)
assert im.getpixel((0, 0)) == (0, 0, 0, 255)
def test_transparency_in_second_frame(tmp_path: Path) -> None:
out = str(tmp_path / "temp.gif")
with Image.open("Tests/images/different_transparency.gif") as im:

10
src/PIL/GifImagePlugin.py
View File

@ -629,7 +629,7 @@ def _write_multiple_frames(im, fp, palette):
"duration"
]
continue
if encoderinfo.get("disposal") == 2:
if im_frames[-1]["encoderinfo"].get("disposal") == 2:
if background_im is None:
color = im.encoderinfo.get(
"transparency", im.info.get("transparency", (0, 0, 0))
@ -637,12 +637,8 @@ def _write_multiple_frames(im, fp, palette):
background = _get_background(im_frame, color)
background_im = Image.new("P", im_frame.size, background)
background_im.putpalette(im_frames[0]["im"].palette)
delta, bbox = _getbbox(background_im, im_frame)
if (
encoderinfo.get("optimize")
and im_frames[-1]["encoderinfo"].get("disposal") != 2
and im_frame.mode != "1"
):
bbox = _getbbox(background_im, im_frame)[1]
elif encoderinfo.get("optimize") and im_frame.mode != "1":
if "transparency" not in encoderinfo:
try:
encoderinfo["transparency"] = (