56 lines
1.5 KiB
Python
56 lines
1.5 KiB
Python
from typing import List, Optional
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import numpy as np
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from PIL import Image
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class StageResult:
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"""
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Chain pipeline stage result.
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Can contain PIL images or numpy arrays, with helpers to convert between them.
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This class intentionally does not provide `__iter__`, to ensure clients get results in the format
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they are expected.
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"""
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arrays: Optional[List[np.ndarray]]
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images: Optional[List[Image.Image]]
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@staticmethod
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def empty():
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return StageResult(images=[])
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@staticmethod
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def from_arrays(arrays: List[np.ndarray]):
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return StageResult(arrays=arrays)
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@staticmethod
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def from_images(images: List[Image.Image]):
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return StageResult(images=images)
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def __init__(self, arrays=None, images=None) -> None:
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if arrays is not None and images is not None:
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raise ValueError("stages must only return one type of result")
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elif arrays is None and images is None:
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raise ValueError("stages must return results")
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self.arrays = arrays
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self.images = images
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def __len__(self) -> int:
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if self.arrays is not None:
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return len(self.arrays)
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else:
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return len(self.images)
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def as_numpy(self) -> List[np.ndarray]:
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if self.arrays is not None:
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return self.arrays
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return [np.array(i) for i in self.images]
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def as_image(self) -> List[Image.Image]:
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if self.images is not None:
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return self.images
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return [Image.fromarray(np.uint8(i), "RGB") for i in self.arrays]
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