411 lines
14 KiB
Objective-C
411 lines
14 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 "RCTImageLoader.h"
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#import <libkern/OSAtomic.h>
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#import <UIKit/UIKit.h>
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#import "RCTConvert.h"
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#import "RCTDefines.h"
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#import "RCTImageUtils.h"
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#import "RCTLog.h"
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#import "RCTNetworking.h"
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#import "RCTUtils.h"
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@implementation UIImage (React)
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- (CAKeyframeAnimation *)reactKeyframeAnimation
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{
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return objc_getAssociatedObject(self, _cmd);
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}
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- (void)setReactKeyframeAnimation:(CAKeyframeAnimation *)reactKeyframeAnimation
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{
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objc_setAssociatedObject(self, @selector(reactKeyframeAnimation), reactKeyframeAnimation, OBJC_ASSOCIATION_COPY_NONATOMIC);
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}
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@end
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@implementation RCTImageLoader
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{
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NSArray<id<RCTImageURLLoader>> *_loaders;
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NSArray<id<RCTImageDataDecoder>> *_decoders;
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NSURLCache *_cache;
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}
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@synthesize bridge = _bridge;
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RCT_EXPORT_MODULE()
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- (void)setBridge:(RCTBridge *)bridge
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{
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// Get image loaders and decoders
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NSMutableArray<id<RCTImageURLLoader>> *loaders = [NSMutableArray array];
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NSMutableArray<id<RCTImageDataDecoder>> *decoders = [NSMutableArray array];
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for (id<RCTBridgeModule> module in bridge.modules.allValues) {
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if ([module conformsToProtocol:@protocol(RCTImageURLLoader)]) {
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[loaders addObject:(id<RCTImageURLLoader>)module];
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}
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if ([module conformsToProtocol:@protocol(RCTImageDataDecoder)]) {
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[decoders addObject:(id<RCTImageDataDecoder>)module];
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}
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}
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// Sort loaders in reverse priority order (highest priority first)
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[loaders sortUsingComparator:^NSComparisonResult(id<RCTImageURLLoader> a, id<RCTImageURLLoader> b) {
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float priorityA = [a respondsToSelector:@selector(loaderPriority)] ? [a loaderPriority] : 0;
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float priorityB = [b respondsToSelector:@selector(loaderPriority)] ? [b loaderPriority] : 0;
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if (priorityA > priorityB) {
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return NSOrderedAscending;
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} else if (priorityA < priorityB) {
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return NSOrderedDescending;
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} else {
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return NSOrderedSame;
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}
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}];
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// Sort decoders in reverse priority order (highest priority first)
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[decoders sortUsingComparator:^NSComparisonResult(id<RCTImageDataDecoder> a, id<RCTImageDataDecoder> b) {
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float priorityA = [a respondsToSelector:@selector(decoderPriority)] ? [a decoderPriority] : 0;
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float priorityB = [b respondsToSelector:@selector(decoderPriority)] ? [b decoderPriority] : 0;
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if (priorityA > priorityB) {
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return NSOrderedAscending;
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} else if (priorityA < priorityB) {
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return NSOrderedDescending;
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} else {
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return NSOrderedSame;
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}
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}];
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_bridge = bridge;
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_loaders = loaders;
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_decoders = decoders;
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_cache = [[NSURLCache alloc] initWithMemoryCapacity:5 * 1024 * 1024 // 5MB
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diskCapacity:200 * 1024 * 1024 // 200MB
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diskPath:@"React/RCTImageDownloader"];
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}
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- (id<RCTImageURLLoader>)imageURLLoaderForURL:(NSURL *)URL
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{
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if (RCT_DEBUG) {
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// Check for handler conflicts
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float previousPriority = 0;
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id<RCTImageURLLoader> previousLoader = nil;
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for (id<RCTImageURLLoader> loader in _loaders) {
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if ([loader canLoadImageURL:URL]) {
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float priority = [loader respondsToSelector:@selector(loaderPriority)] ? [loader loaderPriority] : 0;
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if (previousLoader) {
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if (priority == previousPriority) {
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RCTLogError(@"The RCTImageURLLoaders %@ and %@ both reported that"
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" they can load the URL %@, and have equal priority"
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" (%g). This could result in non-deterministic behavior.",
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loader, previousLoader, URL, priority);
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}
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} else {
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previousLoader = loader;
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previousPriority = priority;
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}
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}
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}
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}
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// Normal code path
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for (id<RCTImageURLLoader> loader in _loaders) {
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if ([loader canLoadImageURL:URL]) {
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return loader;
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}
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}
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return nil;
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}
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- (id<RCTImageDataDecoder>)imageDataDecoderForData:(NSData *)data
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{
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if (RCT_DEBUG) {
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// Check for handler conflicts
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float previousPriority = 0;
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id<RCTImageDataDecoder> previousDecoder = nil;
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for (id<RCTImageDataDecoder> decoder in _decoders) {
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if ([decoder canDecodeImageData:data]) {
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float priority = [decoder respondsToSelector:@selector(decoderPriority)] ? [decoder decoderPriority] : 0;
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if (previousDecoder) {
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if (priority == previousPriority) {
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RCTLogError(@"The RCTImageDataDecoders %@ and %@ both reported that"
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" they can decode the data <NSData %p; %tu bytes>, and"
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" have equal priority (%g). This could result in"
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" non-deterministic behavior.",
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decoder, previousDecoder, data, data.length, priority);
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}
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} else {
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previousDecoder = decoder;
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previousPriority = priority;
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}
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}
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}
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}
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// Normal code path
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for (id<RCTImageDataDecoder> decoder in _decoders) {
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if ([decoder canDecodeImageData:data]) {
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return decoder;
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}
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}
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return nil;
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}
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- (RCTImageLoaderCancellationBlock)loadImageWithTag:(NSString *)imageTag
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callback:(RCTImageLoaderCompletionBlock)callback
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{
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return [self loadImageWithTag:imageTag
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size:CGSizeZero
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scale:1
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resizeMode:UIViewContentModeScaleToFill
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progressBlock:nil
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completionBlock:callback];
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}
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- (RCTImageLoaderCancellationBlock)loadImageWithTag:(NSString *)imageTag
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size:(CGSize)size
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scale:(CGFloat)scale
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resizeMode:(UIViewContentMode)resizeMode
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progressBlock:(RCTImageLoaderProgressBlock)progressHandler
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completionBlock:(RCTImageLoaderCompletionBlock)completionBlock
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{
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if (imageTag.length == 0) {
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RCTLogWarn(@"source.uri should not be an empty string <Native>");
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return ^{};
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}
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__block volatile uint32_t cancelled = 0;
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RCTImageLoaderCompletionBlock completionHandler = ^(NSError *error, UIImage *image) {
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if ([NSThread isMainThread]) {
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// Most loaders do not return on the main thread, so caller is probably not
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// expecting it, and may do expensive post-processing in the callback
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dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
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if (!cancelled) {
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completionBlock(error, image);
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}
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});
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} else if (!cancelled) {
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completionBlock(error, image);
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}
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};
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// Find suitable image URL loader
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NSURLRequest *request = [RCTConvert NSURLRequest:imageTag];
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id<RCTImageURLLoader> loadHandler = [self imageURLLoaderForURL:request.URL];
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if (loadHandler) {
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return [loadHandler loadImageForURL:request.URL
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size:size
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scale:scale
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resizeMode:resizeMode
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progressHandler:progressHandler
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completionHandler:completionHandler] ?: ^{};
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}
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// Check if networking module is available
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if (![_bridge respondsToSelector:@selector(networking)]) {
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RCTLogError(@"No suitable image URL loader found for %@. You may need to "
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" import the RCTNetworking library in order to load images.",
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imageTag);
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return ^{};
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}
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// Use networking module to load image
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if ([_bridge.networking canHandleRequest:request]) {
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__weak RCTImageLoader *weakSelf = self;
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__block RCTImageLoaderCancellationBlock decodeCancel = nil;
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RCTURLRequestCompletionBlock processResponse =
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^(NSURLResponse *response, NSData *data, NSError *error) {
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// Check for system errors
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if (error) {
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completionHandler(error, nil);
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return;
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} else if (!data) {
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completionHandler(RCTErrorWithMessage(@"Unknown image download error"), nil);
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return;
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}
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// Check for http errors
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if ([response isKindOfClass:[NSHTTPURLResponse class]]) {
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NSInteger statusCode = ((NSHTTPURLResponse *)response).statusCode;
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if (statusCode != 200) {
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completionHandler([[NSError alloc] initWithDomain:NSURLErrorDomain
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code:statusCode
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userInfo:nil], nil);
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return;
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}
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}
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// Decode image
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decodeCancel = [weakSelf decodeImageData:data
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size:size
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scale:scale
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resizeMode:resizeMode
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completionBlock:completionHandler];
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};
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// Check for cached response before reloading
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// TODO: move URL cache out of RCTImageLoader into its own module
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NSCachedURLResponse *cachedResponse = [_cache cachedResponseForRequest:request];
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if (cachedResponse) {
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processResponse(cachedResponse.response, cachedResponse.data, nil);
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return ^{};
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}
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// Add missing png extension
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if (request.URL.fileURL && request.URL.pathExtension.length == 0) {
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NSMutableURLRequest *mutableRequest = [request mutableCopy];
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mutableRequest.URL = [NSURL fileURLWithPath:[request.URL.path stringByAppendingPathExtension:@"png"]];
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request = mutableRequest;
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}
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// Download image
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RCTNetworkTask *task = [_bridge.networking networkTaskWithRequest:request completionBlock:
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^(NSURLResponse *response, NSData *data, NSError *error) {
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if (error) {
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completionHandler(error, nil);
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return;
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}
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// Cache the response
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// TODO: move URL cache out of RCTImageLoader into its own module
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RCTImageLoader *strongSelf = weakSelf;
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BOOL isHTTPRequest = [request.URL.scheme hasPrefix:@"http"];
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[strongSelf->_cache storeCachedResponse:
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[[NSCachedURLResponse alloc] initWithResponse:response
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data:data
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userInfo:nil
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storagePolicy:isHTTPRequest ? NSURLCacheStorageAllowed: NSURLCacheStorageAllowedInMemoryOnly]
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forRequest:request];
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// Process image data
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processResponse(response, data, nil);
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}];
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task.downloadProgressBlock = progressHandler;
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[task start];
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return ^{
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[task cancel];
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if (decodeCancel) {
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decodeCancel();
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}
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OSAtomicOr32Barrier(1, &cancelled);
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};
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}
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RCTLogError(@"No suitable image URL loader found for %@", imageTag);
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return ^{};
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}
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- (RCTImageLoaderCancellationBlock)decodeImageData:(NSData *)data
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size:(CGSize)size
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scale:(CGFloat)scale
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resizeMode:(UIViewContentMode)resizeMode
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completionBlock:(RCTImageLoaderCompletionBlock)completionHandler
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{
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id<RCTImageDataDecoder> imageDecoder = [self imageDataDecoderForData:data];
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if (imageDecoder) {
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return [imageDecoder decodeImageData:data
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size:size
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scale:scale
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resizeMode:resizeMode
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completionHandler:completionHandler];
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} else {
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__block volatile uint32_t cancelled = 0;
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dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
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if (cancelled) {
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return;
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}
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UIImage *image = [UIImage imageWithData:data scale:scale];
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if (image) {
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completionHandler(nil, image);
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} else {
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NSString *errorMessage = [NSString stringWithFormat:@"Error decoding image data <NSData %p; %tu bytes>", data, data.length];
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NSError *finalError = RCTErrorWithMessage(errorMessage);
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completionHandler(finalError, nil);
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}
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});
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return ^{
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OSAtomicOr32Barrier(1, &cancelled);
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};
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}
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}
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#pragma mark - RCTURLRequestHandler
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- (BOOL)canHandleRequest:(NSURLRequest *)request
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{
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NSURL *requestURL = request.URL;
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for (id<RCTBridgeModule> module in _bridge.modules.allValues) {
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if ([module conformsToProtocol:@protocol(RCTImageURLLoader)] &&
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[(id<RCTImageURLLoader>)module canLoadImageURL:requestURL]) {
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return YES;
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}
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}
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return NO;
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}
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- (id)sendRequest:(NSURLRequest *)request withDelegate:(id<RCTURLRequestDelegate>)delegate
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{
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__block RCTImageLoaderCancellationBlock requestToken;
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requestToken = [self loadImageWithTag:request.URL.absoluteString callback:^(NSError *error, UIImage *image) {
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if (error) {
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[delegate URLRequest:requestToken didCompleteWithError:error];
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return;
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}
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NSString *mimeType = nil;
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NSData *imageData = nil;
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if (RCTImageHasAlpha(image.CGImage)) {
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mimeType = @"image/png";
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imageData = UIImagePNGRepresentation(image);
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} else {
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mimeType = @"image/jpeg";
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imageData = UIImageJPEGRepresentation(image, 1.0);
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}
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NSURLResponse *response = [[NSURLResponse alloc] initWithURL:request.URL
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MIMEType:mimeType
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expectedContentLength:imageData.length
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textEncodingName:nil];
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[delegate URLRequest:requestToken didReceiveResponse:response];
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[delegate URLRequest:requestToken didReceiveData:imageData];
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[delegate URLRequest:requestToken didCompleteWithError:nil];
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}];
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return requestToken;
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}
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- (void)cancelRequest:(id)requestToken
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{
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if (requestToken) {
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((RCTImageLoaderCancellationBlock)requestToken)();
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}
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}
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@end
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@implementation RCTBridge (RCTImageLoader)
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- (RCTImageLoader *)imageLoader
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{
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return self.modules[RCTBridgeModuleNameForClass([RCTImageLoader class])];
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}
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@end
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