100 lines
3.0 KiB
Objective-C
100 lines
3.0 KiB
Objective-C
/**
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* Copyright (c) 2015-present, Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under the BSD-style license found in the
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* LICENSE file in the root directory of this source tree. An additional grant
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* of patent rights can be found in the PATENTS file in the same directory.
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*/
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#import "RCTImageCache.h"
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#import <objc/runtime.h>
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#import <ImageIO/ImageIO.h>
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#import <React/RCTConvert.h>
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#import <React/RCTNetworking.h>
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#import <React/RCTUtils.h>
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#import "RCTImageUtils.h"
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static const NSUInteger RCTMaxCachableDecodedImageSizeInBytes = 1048576; // 1MB
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static NSString *RCTCacheKeyForImage(NSString *imageTag, CGSize size, CGFloat scale,
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RCTResizeMode resizeMode, NSString *responseDate)
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{
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return [NSString stringWithFormat:@"%@|%g|%g|%g|%lld|%@",
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imageTag, size.width, size.height, scale, (long long)resizeMode, responseDate];
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}
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@implementation RCTImageCache
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{
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NSOperationQueue *_imageDecodeQueue;
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NSCache *_decodedImageCache;
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}
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- (instancetype)init
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{
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_decodedImageCache = [NSCache new];
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_decodedImageCache.totalCostLimit = 5 * 1024 * 1024; // 5MB
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[[NSNotificationCenter defaultCenter] addObserver:self
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selector:@selector(clearCache)
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name:UIApplicationDidReceiveMemoryWarningNotification
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object:nil];
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[[NSNotificationCenter defaultCenter] addObserver:self
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selector:@selector(clearCache)
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name:UIApplicationWillResignActiveNotification
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object:nil];
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return self;
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}
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- (void)dealloc
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{
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[[NSNotificationCenter defaultCenter] removeObserver:self];
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}
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- (void)clearCache
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{
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[_decodedImageCache removeAllObjects];
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}
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- (void)addImageToCache:(UIImage *)image
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forKey:(NSString *)cacheKey
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{
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if (!image) {
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return;
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}
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CGFloat bytes = image.size.width * image.size.height * image.scale * image.scale * 4;
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if (bytes <= RCTMaxCachableDecodedImageSizeInBytes) {
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[self->_decodedImageCache setObject:image
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forKey:cacheKey
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cost:bytes];
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}
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}
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- (UIImage *)imageForUrl:(NSString *)url
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size:(CGSize)size
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scale:(CGFloat)scale
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resizeMode:(RCTResizeMode)resizeMode
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responseDate:(NSString *)responseDate
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{
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NSString *cacheKey = RCTCacheKeyForImage(url, size, scale, resizeMode, responseDate);
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return [_decodedImageCache objectForKey:cacheKey];
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}
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- (void)addImageToCache:(UIImage *)image
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URL:(NSString *)url
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size:(CGSize)size
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scale:(CGFloat)scale
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resizeMode:(RCTResizeMode)resizeMode
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responseDate:(NSString *)responseDate
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{
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NSString *cacheKey = RCTCacheKeyForImage(url, size, scale, resizeMode, responseDate);
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return [self addImageToCache:image forKey:cacheKey];
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}
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@end
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