SDWebImage/SDWebImage

Features

• URL Image Downloaders - Provides an asynchronous network utility to fetch images from URLs without blocking the main application thread.
• Custom Loading and Caching Logic - Allows Kingfisher to replace default memory and disk loading logic with custom implementations to control how data is fetched and stored.
• Network Image Caching - Implements a tiered memory and disk caching system to persist remote image data and minimize network requests.
• iOS Persistent Image Caches - Ships with a persistent disk cache for iOS to store image data across app sessions and avoid redundant downloads.
• Tiered Caching Systems - Employs a tiered caching system combining fast memory and persistent disk storage to minimize network latency.
• Animated Image Rendering - Implements a specialized rendering engine for animated formats like GIF and WebP with memory optimizations.
• Plugin-Based Decoders - Uses a plugin-based decoder system to support non-native image formats through external modules.
• Image Processing - Provides a framework for decoding, encoding, and applying transformations such as scaling and cropping to images.
• Image Format Decoders - Processes various image formats and codecs to prepare raw data for rendering in a user interface.
• Downsampling Decoders - Provides downsampling decoders that reduce memory usage by loading only the necessary pixels for a specific view size.
• Image Loading Libraries - Offers a comprehensive image downloading and caching library specifically for iOS and macOS applications.
• Custom Loading Handlers - Supports custom loading handlers to integrate with specific network stacks or non-standard image data streams.
• Cache Key Generation - Maps complex image URLs to unique strings to ensure consistent cache retrieval regardless of dynamic URL parameters.
• Cache Key Generators - Provides custom cache key generation to transform dynamic URLs into consistent identifiers for cache lookups.
• HTTP Caching - Complies with HTTP cache-control headers to determine when images should be reloaded from the server.
• Cache Expiration Management - Manages cache expiration and memory limits to prevent system memory pressure and ensure data freshness.
• Storage Backend Integrations - Provides storage backend integrations allowing the swapping of default caches for third-party external storage plugins.
• Progressive Rendering - Implements progressive rendering that displays animated images incrementally as they download.
• Post-Decoding Processes - Processes images after decoding, such as resizing or cropping, before storing the results in the cache.
• Composable Transformations - Allows execution of customizable and composable image processing tasks immediately after a remote download.
• Thumbnail Generation - Converts existing images into smaller target sizes during encoding to improve performance and reduce memory.
• Image Format Conversion - Transforms image objects into data representations using specific formats like JPEG, PNG, GIF, or WebP.
• Image Transformation Caching - Applies modifications like scaling or rotating after download and caches the resulting transformed version.
• Image Memory Constraints - Provides memory-aware image scaling to shrink large bitmaps that exceed memory thresholds and prevent application crashes.
• Image Prefetchers - Includes utilities for background image prefetching to load assets into the cache before they are needed by the UI.
• HTTP Request Customization - Allows modification of HTTP requests, server responses, and data decryption to customize how images are acquired.
• Request Cancellations - Enables the cancellation of active image downloads using unique tokens to optimize network resource usage.
• Download Progress Tracking - Provides mechanisms to monitor bytes received during image downloads and trigger completion or failure callbacks.
• Request Header Configuration - Provides tools to set custom HTTP headers, such as the Accept header, to request specific image MIME types.
• Asynchronous Image Loading - Allows fetching images from URLs and assigning them to UI elements using placeholders and progress tracking.
• Asynchronous Task Queues - Implements an asynchronous task queue to manage image downloads and processing without blocking the main UI thread.
• Image Format Plugins - Provides a plugin system for extending the library to support non-native image encoding and decoding formats.
• Request-Response Interceptors - Features a request-response interceptor pipeline to modify network requests and responses before image decoding.

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