diff --git a/Libraries/Image/RCTImageCache.h b/Libraries/Image/RCTImageCache.h new file mode 100644 index 000000000..5d7e9a08f --- /dev/null +++ b/Libraries/Image/RCTImageCache.h @@ -0,0 +1,15 @@ +/** + * Copyright (c) 2015-present, Facebook, Inc. + * All rights reserved. + * + * This source code is licensed under the BSD-style license found in the + * LICENSE file in the root directory of this source tree. An additional grant + * of patent rights can be found in the PATENTS file in the same directory. + */ + +#import + +#import "RCTImageLoader.h" + +@interface RCTImageCache : NSObject +@end diff --git a/Libraries/Image/RCTImageCache.m b/Libraries/Image/RCTImageCache.m new file mode 100644 index 000000000..0af2be95c --- /dev/null +++ b/Libraries/Image/RCTImageCache.m @@ -0,0 +1,100 @@ +/** + * Copyright (c) 2015-present, Facebook, Inc. + * All rights reserved. + * + * This source code is licensed under the BSD-style license found in the + * LICENSE file in the root directory of this source tree. An additional grant + * of patent rights can be found in the PATENTS file in the same directory. + */ + +#import "RCTImageCache.h" + +#import + +#import + +#import + +#import "RCTConvert.h" +#import "RCTImageUtils.h" +#import "RCTNetworking.h" +#import "RCTUtils.h" + +static const NSUInteger RCTMaxCachableDecodedImageSizeInBytes = 1048576; // 1MB + +static NSString *RCTCacheKeyForImage(NSString *imageTag, CGSize size, CGFloat scale, + RCTResizeMode resizeMode, NSString *responseDate) +{ + return [NSString stringWithFormat:@"%@|%g|%g|%g|%zd|%@", + imageTag, size.width, size.height, scale, resizeMode, responseDate]; +} + +@implementation RCTImageCache +{ + NSOperationQueue *_imageDecodeQueue; + NSCache *_decodedImageCache; +} + +- (instancetype)init +{ + _decodedImageCache = [NSCache new]; + _decodedImageCache.totalCostLimit = 5 * 1024 * 1024; // 5MB + + [[NSNotificationCenter defaultCenter] addObserver:self + selector:@selector(clearCache) + name:UIApplicationDidReceiveMemoryWarningNotification + object:nil]; + [[NSNotificationCenter defaultCenter] addObserver:self + selector:@selector(clearCache) + name:UIApplicationWillResignActiveNotification + object:nil]; + + return self; +} + +- (void)dealloc +{ + [[NSNotificationCenter defaultCenter] removeObserver:self]; +} + +- (void)clearCache +{ + [_decodedImageCache removeAllObjects]; +} + +- (void)addImageToCache:(UIImage *)image + forKey:(NSString *)cacheKey +{ + if (!image) { + return; + } + CGFloat bytes = image.size.width * image.size.height * image.scale * image.scale * 4; + if (bytes <= RCTMaxCachableDecodedImageSizeInBytes) { + [self->_decodedImageCache setObject:image + forKey:cacheKey + cost:bytes]; + } +} + +- (UIImage *)imageForUrl:(NSString *)url + size:(CGSize)size + scale:(CGFloat)scale + resizeMode:(RCTResizeMode)resizeMode + responseDate:(NSString *)responseDate +{ + NSString *cacheKey = RCTCacheKeyForImage(url, size, scale, resizeMode, responseDate); + return [_decodedImageCache objectForKey:cacheKey]; +} + +- (void)addImageToCache:(UIImage *)image + URL:(NSString *)url + size:(CGSize)size + scale:(CGFloat)scale + resizeMode:(RCTResizeMode)resizeMode + responseDate:(NSString *)responseDate +{ + NSString *cacheKey = RCTCacheKeyForImage(url, size, scale, resizeMode, responseDate); + return [self addImageToCache:image forKey:cacheKey]; +} + +@end