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13 lines
355 B
Python
13 lines
355 B
Python
from typing import Any
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import numpy as np
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def premultiply_alpha(source: bytes) -> bytes:
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buffer: np.ndarray[Any, np.dtype[np.double]] = np.frombuffer(source, dtype=np.uint8).astype(np.double)
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alpha = buffer[3::4] / 255.0
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buffer[0::4] *= alpha
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buffer[1::4] *= alpha
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buffer[2::4] *= alpha
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return buffer.astype(np.uint8).tobytes()
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