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