84 lines
2.7 KiB
Python
84 lines
2.7 KiB
Python
from pathlib import Path
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from uuid import uuid4
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import cv2
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import numpy as np
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from django.conf import settings
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from .algorithms import ProcessingError, ensure_uint8, image_to_data_url
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def session_dir():
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path = Path(settings.MEDIA_ROOT) / "sessions"
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path.mkdir(parents=True, exist_ok=True)
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return path
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def save_image_array(image, prefix="image"):
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filename = f"sessions/{prefix}-{uuid4().hex}.png"
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path = Path(settings.MEDIA_ROOT) / filename
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path.parent.mkdir(parents=True, exist_ok=True)
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array = ensure_uint8(image)
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if array.ndim == 2:
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encoded_source = array
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else:
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encoded_source = cv2.cvtColor(array, cv2.COLOR_RGB2BGR)
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ok, encoded = cv2.imencode(".png", encoded_source)
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if not ok:
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raise ProcessingError("Unable to encode image for temporary storage.")
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path.write_bytes(encoded.tobytes())
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return filename
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def save_fft_array(spectrum, prefix="fft"):
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filename = f"sessions/{prefix}-{uuid4().hex}.npz"
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path = Path(settings.MEDIA_ROOT) / filename
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path.parent.mkdir(parents=True, exist_ok=True)
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np.savez_compressed(path, spectrum=spectrum)
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return filename
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def load_image_array(relative_path):
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path = Path(settings.MEDIA_ROOT) / relative_path
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if not path.exists():
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raise ProcessingError("Temporary image file is missing or unreadable.")
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raw = np.frombuffer(path.read_bytes(), dtype=np.uint8)
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image = cv2.imdecode(raw, cv2.IMREAD_UNCHANGED)
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if image is None:
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raise ProcessingError("Temporary image file is missing or unreadable.")
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if image.ndim == 2:
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return image.astype(np.uint8)
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if image.shape[2] == 4:
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return cv2.cvtColor(image, cv2.COLOR_BGRA2RGB).astype(np.uint8)
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return cv2.cvtColor(image, cv2.COLOR_BGR2RGB).astype(np.uint8)
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def load_fft_array(relative_path):
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path = Path(settings.MEDIA_ROOT) / relative_path
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if not path.exists():
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raise ProcessingError("FFT data file is missing or unreadable.")
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try:
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with np.load(path) as payload:
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return payload["spectrum"]
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except (OSError, KeyError, ValueError) as exc:
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raise ProcessingError("FFT data file is missing or unreadable.") from exc
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def delete_relative_file(relative_path):
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if not relative_path:
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return
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path = (Path(settings.MEDIA_ROOT) / relative_path).resolve()
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media_root = Path(settings.MEDIA_ROOT).resolve()
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if media_root not in path.parents and path != media_root:
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return
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if path.exists():
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path.unlink()
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def payload_for_image(image, relative_path):
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return {
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"image_path": relative_path,
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"image_url": f"{settings.MEDIA_URL}{relative_path}",
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"image_data": image_to_data_url(image),
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}
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