path/FastImageCache
FastImageCache
FastImageCache is an iOS image caching library that provides a persistent disk-based image store. It utilizes a persistent bitmap cache to store images in uncompressed formats and incorporates an image pre-processing pipeline to optimize assets before they are committed to storage.
The library optimizes rendering performance by using memory-mapped image tables for constant-time retrieval and byte-aligned data layouts to prevent memory copies. It organizes images of identical dimensions into shared tables and manages disk space through a least-recently-used cache eviction system.
The project also covers asynchronous image loading with request deduplication to prevent redundant network activity and the generation of image variants. Additional capabilities include image format specification for bit-depth control and disk encryption configurations to manage data access on locked devices.
Features
- iOS Persistent Image Caches - Provides a persistent disk cache for iOS to prevent interface stutter during high-speed list scrolling.
- Scrolling Performance Caches - Stores and retrieves images from a persistent cache to maintain smooth interface performance during high-speed list movement.
- Disk Caching Systems - Stores images on disk using a model-based approach to ensure fast loading in graphics-heavy applications.
- Byte Alignment Optimizations - Implements byte-aligned data layouts to prevent expensive memory copies and optimize rendering performance.
- Memory-Mapped Storage - Maps image tables directly into the process address space to allow constant-time retrieval with minimal memory overhead.
- Memory-Mapped Image Tables - Packs images of identical dimensions into memory-mapped files to enable constant-time retrieval.
- Uncompressed Bitmap Caching - Saves images in uncompressed bitmap formats to eliminate CPU-intensive decompression during high-speed scrolling.
- Image Processing Pipelines - Transforms and optimizes images into specific formats and dimensions before they are committed to the cache.
- Persistent Image Stores - Implements a persistent storage mechanism that organizes images into memory-mapped files for constant-time retrieval.
- Uncompressed Bitmap Caches - Saves images in uncompressed bitmap formats to eliminate CPU-intensive decompression during rendering.
- Asynchronous Loading - Coordinates network and disk requests to fetch images lazily and avoid redundant downloads for the same asset.
- Image Loading Libraries - Provides a library for storing and retrieving images on disk to ensure smooth scrolling in graphics-heavy iOS applications.
- Asynchronous Image Loading - Triggers image loading only when a cache miss occurs and delivers the result through asynchronous callbacks.
- Byte Alignment Optimizations - Optimizes rendering performance by aligning image rows to memory boundaries to prevent expensive memory copies.
- Cache Expiration Management - Automatically removes old image data from the store based on the recency of the last use.
- Dimension-Based Packing - Groups images of identical dimensions into shared tables to optimize disk space and retrieval speed.
- Transformed Asset Caches - Provides a storage layer for persisting pre-processed image variants to eliminate redundant transformation computations.
- Variant Caching - Generates and caches multiple size or style variants of source images to accelerate delivery.
- URL Request Tracking - Tracks active URL fetches to consolidate multiple requests for the same asset and prevent redundant network activity.
- LRU Cache Eviction - Automatically removes the least recently used image data to maintain a fixed disk footprint.
- Performance-Optimized UI - Reduces CPU overhead and memory copies by using uncompressed bitmaps and byte-aligned data for faster rendering.
- Lazy Image Retrieval - Triggers source loading only when a cache miss occurs, delivering results via asynchronous completion blocks.
- Image Processing - High-performance image retrieval and caching for smooth scrolling.
- Image Processing - Framework for fast image display during scrolling.
