mirror of
https://git.srhtnin.garden/sarah/SaraTune.git
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59 lines
1.9 KiB
Python
59 lines
1.9 KiB
Python
"""Small versions of cover art. Embedded covers can be several megabytes,
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and everything shown goes through Flet's connection, so the album grid and
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play bar get thumbnails, cached in ~/.cache/SaraSuite/SaraTune/Covers/."""
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import hashlib
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import io
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from pathlib import Path
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from typing import Optional
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from PIL import Image, UnidentifiedImageError
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from Core import CacheDir
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from Metadata import ReadCover
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CoversDir = CacheDir / "Covers"
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_NoCover = b"" # remembered in the memory cache so a coverless album isn't read again
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def Thumbnail(Data: bytes, Size: int) -> Optional[bytes]:
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try:
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with Image.open(io.BytesIO(Data)) as Picture:
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Picture = Picture.convert("RGB")
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Picture.thumbnail((Size, Size), Image.LANCZOS)
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Output = io.BytesIO()
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Picture.save(Output, "JPEG", quality=88)
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return Output.getvalue()
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except (UnidentifiedImageError, OSError, ValueError, Image.DecompressionBombError):
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return None
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_Memory: dict[tuple[str, int], bytes] = {}
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def CoverFor(FilePath: str, Size: int) -> Optional[bytes]:
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"""FilePath's cover at most Size pixels wide. Blocking (run it in a
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thread). Cached on disk by path, size and the file's mtime."""
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Key = (FilePath, Size)
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if Key in _Memory:
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return _Memory[Key] or None
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try:
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Stamp = Path(FilePath).stat().st_mtime_ns
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except OSError:
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return None
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Name = hashlib.sha1(f"{FilePath}|{Size}|{Stamp}".encode("utf-8", "surrogateescape")).hexdigest()
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CachePath = CoversDir / f"{Name}.jpg"
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if CachePath.exists():
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Data = CachePath.read_bytes()
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else:
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Original = ReadCover(FilePath)
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Data = Thumbnail(Original, Size) if Original else None
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if Data:
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try:
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CoversDir.mkdir(parents=True, exist_ok=True)
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CachePath.write_bytes(Data)
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except OSError:
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pass
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_Memory[Key] = Data or _NoCover
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return Data
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