-
Notifications
You must be signed in to change notification settings - Fork 7
Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
Showing
13 changed files
with
245 additions
and
53 deletions.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,115 @@ | ||
| # Copyright 2024 SECTRA AB | ||
| # | ||
| # Licensed under the Apache License, Version 2.0 (the "License"); | ||
| # you may not use this file except in compliance with the License. | ||
| # You may obtain a copy of the License at | ||
| # | ||
| # http://www.apache.org/licenses/LICENSE-2.0 | ||
| # | ||
| # Unless required by applicable law or agreed to in writing, software | ||
| # distributed under the License is distributed on an "AS IS" BASIS, | ||
| # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| # See the License for the specific language governing permissions and | ||
| # limitations under the License. | ||
|
|
||
| from collections.abc import Iterator | ||
| from threading import Lock | ||
| from typing import Callable, Dict, Generic, Iterable, Optional, Sequence, Tuple, TypeVar | ||
|
|
||
| from PIL.Image import Image | ||
|
|
||
| CacheKeyType = TypeVar("CacheKeyType") | ||
| CacheItemType = TypeVar("CacheItemType") | ||
|
|
||
|
|
||
| class LRU(Generic[CacheKeyType, CacheItemType]): | ||
| def __init__(self, maxsize: int): | ||
| self._lock = Lock() | ||
| self._cache: Dict[CacheKeyType, CacheItemType] = {} | ||
| self._maxsize = maxsize | ||
|
|
||
| @property | ||
| def maxsize(self) -> int: | ||
| return self._maxsize | ||
|
|
||
| def get(self, key: CacheKeyType) -> Optional[CacheItemType]: | ||
| with self._lock: | ||
| item = self._cache.pop(key, None) | ||
| if item is not None: | ||
| self._cache[key] = item | ||
| return item | ||
|
|
||
| def put(self, key: CacheKeyType, value: CacheItemType) -> None: | ||
| with self._lock: | ||
| self._cache[key] = value | ||
| if len(self._cache) > self._maxsize: | ||
| self._cache.pop(next(iter(self._cache))) | ||
|
|
||
| def clear(self) -> None: | ||
| with self._lock: | ||
| self._cache.clear() | ||
|
|
||
| def resize(self, maxsize: int) -> None: | ||
| with self._lock: | ||
| self._maxsize = maxsize | ||
| if len(self._cache) > maxsize: | ||
| for _ in range(len(self._cache) - maxsize): | ||
| self._cache.pop(next(iter(self._cache))) | ||
|
|
||
|
|
||
| class FrameCache(Generic[CacheItemType]): | ||
| def __init__(self, size: int): | ||
| self._size = size | ||
| self._lru_cache = LRU[Tuple[int, int], CacheItemType](size) | ||
|
|
||
| def get_tile_frame( | ||
| self, | ||
| image_data_id: int, | ||
| frame_index: int, | ||
| frame_getter: Callable[[int], CacheItemType], | ||
| ) -> CacheItemType: | ||
| if self._lru_cache.maxsize < 1: | ||
| return frame_getter(frame_index) | ||
| frame = self._lru_cache.get((image_data_id, frame_index)) | ||
| if frame is None: | ||
| frame = frame_getter(frame_index) | ||
| self._lru_cache.put((image_data_id, frame_index), frame) | ||
| return frame | ||
|
|
||
| def get_tile_frames( | ||
| self, | ||
| image_data_id: int, | ||
| frame_indices: Sequence[int], | ||
| frames_getter: Callable[[Iterable[int]], Iterator[CacheItemType]], | ||
| ) -> Iterator[CacheItemType]: | ||
| if self._lru_cache.maxsize < 1: | ||
| return frames_getter(frame_indices) | ||
| cached_frames = { | ||
| frame_index: frame | ||
| for (frame_index, frame) in ( | ||
| (frame_index, self._lru_cache.get((image_data_id, frame_index))) | ||
| for frame_index in frame_indices | ||
| ) | ||
| if frame is not None | ||
| } | ||
| fetched_frames = frames_getter( | ||
| frame_index | ||
| for frame_index in frame_indices | ||
| if frame_index not in cached_frames | ||
| ) | ||
| for frame_index in frame_indices: | ||
| frame = cached_frames.get(frame_index) | ||
| if frame is None: | ||
| frame = next(fetched_frames) | ||
| self._lru_cache.put((image_data_id, frame_index), frame) | ||
| yield frame | ||
|
|
||
| def clear(self) -> None: | ||
| self._lru_cache.clear() | ||
|
|
||
| def resize(self, size: int) -> None: | ||
| self._lru_cache.resize(size) | ||
|
|
||
|
|
||
| EncodedFrameCache = FrameCache[bytes] | ||
| DecodedFrameCache = FrameCache[Image] |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Oops, something went wrong.