612 lines
22 KiB
Objective-C
612 lines
22 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 <ImageIO/ImageIO.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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NSOperationQueue *_imageDecodeQueue;
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dispatch_queue_t _URLCacheQueue;
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NSURLCache *_URLCache;
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}
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@synthesize bridge = _bridge;
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RCT_EXPORT_MODULE()
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- (void)setUp
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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 (Class moduleClass in _bridge.moduleClasses) {
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if ([moduleClass conformsToProtocol:@protocol(RCTImageURLLoader)]) {
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[loaders addObject:[_bridge moduleForClass:moduleClass]];
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}
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if ([moduleClass conformsToProtocol:@protocol(RCTImageDataDecoder)]) {
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[decoders addObject:[_bridge moduleForClass:moduleClass]];
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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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_loaders = loaders;
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_decoders = decoders;
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}
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- (id<RCTImageURLLoader>)imageURLLoaderForURL:(NSURL *)URL
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{
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if (!_loaders) {
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[self setUp];
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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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float priority = [loader respondsToSelector:@selector(loaderPriority)] ? [loader loaderPriority] : 0;
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if (previousLoader && priority < previousPriority) {
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return previousLoader;
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}
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if ([loader canLoadImageURL:URL]) {
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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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return previousLoader;
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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 (!_decoders) {
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[self setUp];
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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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float priority = [decoder respondsToSelector:@selector(decoderPriority)] ? [decoder decoderPriority] : 0;
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if (previousDecoder && priority < previousPriority) {
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return previousDecoder;
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}
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if ([decoder canDecodeImageData:data]) {
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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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return previousDecoder;
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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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static UIImage *RCTResizeImageIfNeeded(UIImage *image,
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CGSize size,
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CGFloat scale,
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RCTResizeMode resizeMode)
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{
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if (CGSizeEqualToSize(size, CGSizeZero) ||
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CGSizeEqualToSize(image.size, CGSizeZero) ||
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CGSizeEqualToSize(image.size, size)) {
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return image;
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}
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CAKeyframeAnimation *animation = image.reactKeyframeAnimation;
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CGRect targetSize = RCTTargetRect(image.size, size, scale, resizeMode);
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CGAffineTransform transform = RCTTransformFromTargetRect(image.size, targetSize);
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image = RCTTransformImage(image, size, scale, transform);
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image.reactKeyframeAnimation = animation;
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return image;
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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:RCTResizeModeStretch
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progressBlock:nil
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completionBlock:callback];
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}
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/**
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* This returns either an image, or raw image data, depending on the loading
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* path taken. This is useful if you want to skip decoding, e.g. when preloading
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* the image, or retrieving metadata.
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*/
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- (RCTImageLoaderCancellationBlock)loadImageOrDataWithTag:(NSString *)imageTag
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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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progressBlock:(RCTImageLoaderProgressBlock)progressHandler
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completionBlock:(void (^)(NSError *error, id imageOrData))completionBlock
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{
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__block volatile uint32_t cancelled = 0;
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__block void(^cancelLoad)(void) = nil;
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__weak RCTImageLoader *weakSelf = self;
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void (^completionHandler)(NSError *error, id imageOrData) = ^(NSError *error, id imageOrData) {
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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, imageOrData);
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}
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});
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} else if (!cancelled) {
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completionBlock(error, imageOrData);
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}
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};
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if (imageTag.length == 0) {
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completionHandler(RCTErrorWithMessage(@"source.uri should not be an empty string"), nil);
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return ^{};
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}
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// All access to URL cache must be serialized
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if (!_URLCacheQueue) {
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_URLCacheQueue = dispatch_queue_create("com.facebook.react.ImageLoaderURLCacheQueue", DISPATCH_QUEUE_SERIAL);
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}
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dispatch_async(_URLCacheQueue, ^{
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if (!_URLCache) {
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_URLCache = [[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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RCTImageLoader *strongSelf = weakSelf;
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if (cancelled || !strongSelf) {
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return;
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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 = [strongSelf imageURLLoaderForURL:request.URL];
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if (loadHandler) {
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cancelLoad = [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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return;
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}
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// Check if networking module is available
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if (RCT_DEBUG && ![_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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// Check if networking module can load image
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if (RCT_DEBUG && ![_bridge.networking canHandleRequest:request]) {
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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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// Use networking module to load image
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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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// Call handler
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completionHandler(nil, data);
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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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// 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 = [_URLCache 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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// 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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dispatch_async(_URLCacheQueue, ^{
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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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BOOL isHTTPRequest = [request.URL.scheme hasPrefix:@"http"];
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[strongSelf->_URLCache 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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}];
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task.downloadProgressBlock = progressHandler;
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[task start];
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cancelLoad = ^{
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[task cancel];
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};
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});
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return ^{
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if (cancelLoad) {
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cancelLoad();
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}
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OSAtomicOr32Barrier(1, &cancelled);
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};
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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:(RCTResizeMode)resizeMode
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progressBlock:(RCTImageLoaderProgressBlock)progressHandler
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completionBlock:(RCTImageLoaderCompletionBlock)completionBlock
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{
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return [self loadImageWithoutClipping:imageTag
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size:size
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scale:scale
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resizeMode:resizeMode
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progressBlock:progressHandler
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completionBlock:^(NSError *error, UIImage *image) {
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completionBlock(error, RCTResizeImageIfNeeded(image, size, scale, resizeMode));
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}];
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}
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- (RCTImageLoaderCancellationBlock)loadImageWithoutClipping:(NSString *)imageTag
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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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progressBlock:(RCTImageLoaderProgressBlock)progressHandler
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completionBlock:(RCTImageLoaderCompletionBlock)completionBlock
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{
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__block volatile uint32_t cancelled = 0;
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__block void(^cancelLoad)(void) = nil;
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__weak RCTImageLoader *weakSelf = self;
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void (^completionHandler)(NSError *error, id imageOrData) = ^(NSError *error, id imageOrData) {
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if (!cancelled) {
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if (!imageOrData || [imageOrData isKindOfClass:[UIImage class]]) {
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completionBlock(error, imageOrData);
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} else {
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cancelLoad = [weakSelf decodeImageDataWithoutClipping:imageOrData
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size:size
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scale:scale
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resizeMode:resizeMode
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completionBlock:completionBlock] ?: ^{};
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}
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}
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};
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cancelLoad = [self loadImageOrDataWithTag:imageTag
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size:size
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scale:scale
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resizeMode:resizeMode
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progressBlock:progressHandler
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completionBlock:completionHandler] ?: ^{};
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return ^{
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if (cancelLoad) {
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cancelLoad();
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}
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OSAtomicOr32Barrier(1, &cancelled);
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};
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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:(RCTResizeMode)resizeMode
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completionBlock:(RCTImageLoaderCompletionBlock)completionBlock
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{
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return [self decodeImageDataWithoutClipping:data
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size:size
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scale:scale
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resizeMode:resizeMode
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completionBlock:^(NSError *error, UIImage *image) {
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completionBlock(error, RCTResizeImageIfNeeded(image, size, scale, resizeMode));
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}];
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}
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- (RCTImageLoaderCancellationBlock)decodeImageDataWithoutClipping:(NSData *)data
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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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completionBlock:(RCTImageLoaderCompletionBlock)completionBlock
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{
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if (data.length == 0) {
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completionBlock(RCTErrorWithMessage(@"No image data"), nil);
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return ^{};
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}
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__block volatile uint32_t cancelled = 0;
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void (^completionHandler)(NSError *, UIImage *) = ^(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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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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// Serialize decoding to prevent excessive memory usage
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if (!_imageDecodeQueue) {
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_imageDecodeQueue = [NSOperationQueue new];
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_imageDecodeQueue.name = @"com.facebook.react.ImageDecoderQueue";
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_imageDecodeQueue.maxConcurrentOperationCount = 2;
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}
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[_imageDecodeQueue addOperationWithBlock:^{
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if (cancelled) {
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return;
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}
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UIImage *image = RCTDecodeImageWithData(data, size, scale, resizeMode);
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#if RCT_DEV
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CGSize imagePixelSize = RCTSizeInPixels(image.size, image.scale);
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CGSize screenPixelSize = RCTSizeInPixels(RCTScreenSize(), RCTScreenScale());
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if (imagePixelSize.width * imagePixelSize.height >
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screenPixelSize.width * screenPixelSize.height) {
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RCTLogInfo(@"[PERF ASSETS] Loading image at size %@, which is larger "
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"than the screen size %@", NSStringFromCGSize(imagePixelSize),
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NSStringFromCGSize(screenPixelSize));
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}
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#endif
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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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- (RCTImageLoaderCancellationBlock)getImageSize:(NSString *)imageTag
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block:(void(^)(NSError *error, CGSize size))completionBlock
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{
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return [self loadImageOrDataWithTag:imageTag
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size:CGSizeZero
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scale:1
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resizeMode:RCTResizeModeStretch
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progressBlock:nil
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completionBlock:^(NSError *error, id imageOrData) {
|
|
CGSize size;
|
|
if ([imageOrData isKindOfClass:[NSData class]]) {
|
|
NSDictionary *meta = RCTGetImageMetadata(imageOrData);
|
|
size = (CGSize){
|
|
[meta[(id)kCGImagePropertyPixelWidth] doubleValue],
|
|
[meta[(id)kCGImagePropertyPixelHeight] doubleValue],
|
|
};
|
|
} else {
|
|
UIImage *image = imageOrData;
|
|
size = (CGSize){
|
|
image.size.width * image.scale,
|
|
image.size.height * image.scale,
|
|
};
|
|
}
|
|
completionBlock(error, size);
|
|
}];
|
|
}
|
|
|
|
#pragma mark - RCTURLRequestHandler
|
|
|
|
- (BOOL)canHandleRequest:(NSURLRequest *)request
|
|
{
|
|
NSURL *requestURL = request.URL;
|
|
for (id<RCTImageURLLoader> loader in _loaders) {
|
|
// Don't use RCTImageURLLoader protocol for modules that already conform to
|
|
// RCTURLRequestHandler as it's inefficient to decode an image and then
|
|
// convert it back into data
|
|
if (![loader conformsToProtocol:@protocol(RCTURLRequestHandler)] &&
|
|
[loader canLoadImageURL:requestURL]) {
|
|
return YES;
|
|
}
|
|
}
|
|
return NO;
|
|
}
|
|
|
|
- (id)sendRequest:(NSURLRequest *)request withDelegate:(id<RCTURLRequestDelegate>)delegate
|
|
{
|
|
__block RCTImageLoaderCancellationBlock requestToken;
|
|
requestToken = [self loadImageWithTag:request.URL.absoluteString callback:^(NSError *error, UIImage *image) {
|
|
if (error) {
|
|
[delegate URLRequest:requestToken didCompleteWithError:error];
|
|
return;
|
|
}
|
|
|
|
NSString *mimeType = nil;
|
|
NSData *imageData = nil;
|
|
if (RCTImageHasAlpha(image.CGImage)) {
|
|
mimeType = @"image/png";
|
|
imageData = UIImagePNGRepresentation(image);
|
|
} else {
|
|
mimeType = @"image/jpeg";
|
|
imageData = UIImageJPEGRepresentation(image, 1.0);
|
|
}
|
|
|
|
NSURLResponse *response = [[NSURLResponse alloc] initWithURL:request.URL
|
|
MIMEType:mimeType
|
|
expectedContentLength:imageData.length
|
|
textEncodingName:nil];
|
|
|
|
[delegate URLRequest:requestToken didReceiveResponse:response];
|
|
[delegate URLRequest:requestToken didReceiveData:imageData];
|
|
[delegate URLRequest:requestToken didCompleteWithError:nil];
|
|
}];
|
|
|
|
return requestToken;
|
|
}
|
|
|
|
- (void)cancelRequest:(id)requestToken
|
|
{
|
|
if (requestToken) {
|
|
((RCTImageLoaderCancellationBlock)requestToken)();
|
|
}
|
|
}
|
|
|
|
@end
|
|
|
|
@implementation RCTBridge (RCTImageLoader)
|
|
|
|
- (RCTImageLoader *)imageLoader
|
|
{
|
|
return [self moduleForClass:[RCTImageLoader class]];
|
|
}
|
|
|
|
@end
|