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| # | |
| # The Python Imaging Library. | |
| # $Id$ | |
| # | |
| # sequence support classes | |
| # | |
| # history: | |
| # 1997-02-20 fl Created | |
| # | |
| # Copyright (c) 1997 by Secret Labs AB. | |
| # Copyright (c) 1997 by Fredrik Lundh. | |
| # | |
| # See the README file for information on usage and redistribution. | |
| # | |
| ## | |
| 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): | |
| 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 | |