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| from __future__ import annotations
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| from . import Image
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| TYPE_CHECKING = False
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| if TYPE_CHECKING:
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| from collections.abc import Callable
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| class Iterator:
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| """
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| This class implements an iterator object that can be used to loop
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| over an image sequence.
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| You can use the ``[]`` operator to access elements by index. This operator
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| will raise an :py:exc:`IndexError` if you try to access a nonexistent
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| frame.
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| :param im: An image object.
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| """
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| def __init__(self, im: Image.Image) -> None:
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| if not hasattr(im, "seek"):
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| msg = "im must have seek method"
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| raise AttributeError(msg)
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| self.im = im
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| self.position = getattr(self.im, "_min_frame", 0)
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| def __getitem__(self, ix: int) -> Image.Image:
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| try:
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| self.im.seek(ix)
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| return self.im
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| except EOFError as e:
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| msg = "end of sequence"
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| raise IndexError(msg) from e
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| def __iter__(self) -> Iterator:
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| return self
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| def __next__(self) -> Image.Image:
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| try:
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| self.im.seek(self.position)
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| self.position += 1
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| return self.im
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| except EOFError as e:
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| msg = "end of sequence"
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| raise StopIteration(msg) from e
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| def all_frames(
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| im: Image.Image | list[Image.Image],
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| func: Callable[[Image.Image], Image.Image] | None = None,
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| ) -> list[Image.Image]:
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| """
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| Applies a given function to all frames in an image or a list of images.
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| The frames are returned as a list of separate images.
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| :param im: An image, or a list of images.
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| :param func: The function to apply to all of the image frames.
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| :returns: A list of images.
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| """
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| if not isinstance(im, list):
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| im = [im]
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| ims = []
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| for imSequence in im:
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| current = imSequence.tell()
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| ims += [im_frame.copy() for im_frame in Iterator(imSequence)]
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| imSequence.seek(current)
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| return [func(im) for im in ims] if func else ims
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|
