/*
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* This file is part of the SDWebImage package.
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* (c) Olivier Poitrey <rs@dailymotion.com>
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*
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* For the full copyright and license information, please view the LICENSE
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* file that was distributed with this source code.
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*/
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#import "SDWebImageCodersManager.h"
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#import "SDWebImageImageIOCoder.h"
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#import "SDWebImageGIFCoder.h"
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#ifdef SD_WEBP
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#import "SDWebImageWebPCoder.h"
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#endif
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#define LOCK(lock) dispatch_semaphore_wait(lock, DISPATCH_TIME_FOREVER);
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#define UNLOCK(lock) dispatch_semaphore_signal(lock);
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@interface SDWebImageCodersManager ()
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@property (nonatomic, strong, nonnull) dispatch_semaphore_t codersLock;
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@end
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@implementation SDWebImageCodersManager
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+ (nonnull instancetype)sharedInstance {
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static dispatch_once_t once;
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static id instance;
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dispatch_once(&once, ^{
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instance = [self new];
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});
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return instance;
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}
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- (instancetype)init {
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if (self = [super init]) {
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// initialize with default coders
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NSMutableArray<id<SDWebImageCoder>> *mutableCoders = [@[[SDWebImageImageIOCoder sharedCoder]] mutableCopy];
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#ifdef SD_WEBP
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[mutableCoders addObject:[SDWebImageWebPCoder sharedCoder]];
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#endif
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_coders = [mutableCoders copy];
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_codersLock = dispatch_semaphore_create(1);
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}
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return self;
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}
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#pragma mark - Coder IO operations
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- (void)addCoder:(nonnull id<SDWebImageCoder>)coder {
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if (![coder conformsToProtocol:@protocol(SDWebImageCoder)]) {
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return;
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}
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LOCK(self.codersLock);
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NSMutableArray<id<SDWebImageCoder>> *mutableCoders = [self.coders mutableCopy];
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if (!mutableCoders) {
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mutableCoders = [NSMutableArray array];
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}
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[mutableCoders addObject:coder];
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self.coders = [mutableCoders copy];
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UNLOCK(self.codersLock);
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}
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- (void)removeCoder:(nonnull id<SDWebImageCoder>)coder {
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if (![coder conformsToProtocol:@protocol(SDWebImageCoder)]) {
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return;
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}
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LOCK(self.codersLock);
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NSMutableArray<id<SDWebImageCoder>> *mutableCoders = [self.coders mutableCopy];
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[mutableCoders removeObject:coder];
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self.coders = [mutableCoders copy];
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UNLOCK(self.codersLock);
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}
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#pragma mark - SDWebImageCoder
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- (BOOL)canDecodeFromData:(NSData *)data {
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LOCK(self.codersLock);
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NSArray<id<SDWebImageCoder>> *coders = self.coders;
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UNLOCK(self.codersLock);
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for (id<SDWebImageCoder> coder in coders.reverseObjectEnumerator) {
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if ([coder canDecodeFromData:data]) {
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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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- (BOOL)canEncodeToFormat:(SDImageFormat)format {
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LOCK(self.codersLock);
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NSArray<id<SDWebImageCoder>> *coders = self.coders;
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UNLOCK(self.codersLock);
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for (id<SDWebImageCoder> coder in coders.reverseObjectEnumerator) {
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if ([coder canEncodeToFormat:format]) {
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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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- (UIImage *)decodedImageWithData:(NSData *)data {
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LOCK(self.codersLock);
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NSArray<id<SDWebImageCoder>> *coders = self.coders;
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UNLOCK(self.codersLock);
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for (id<SDWebImageCoder> coder in coders.reverseObjectEnumerator) {
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if ([coder canDecodeFromData:data]) {
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return [coder decodedImageWithData:data];
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}
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}
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return nil;
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}
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- (UIImage *)decompressedImageWithImage:(UIImage *)image
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data:(NSData *__autoreleasing _Nullable *)data
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options:(nullable NSDictionary<NSString*, NSObject*>*)optionsDict {
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if (!image) {
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return nil;
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}
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LOCK(self.codersLock);
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NSArray<id<SDWebImageCoder>> *coders = self.coders;
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UNLOCK(self.codersLock);
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for (id<SDWebImageCoder> coder in coders.reverseObjectEnumerator) {
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if ([coder canDecodeFromData:*data]) {
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return [coder decompressedImageWithImage:image data:data options:optionsDict];
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}
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}
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return nil;
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}
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- (NSData *)encodedDataWithImage:(UIImage *)image format:(SDImageFormat)format {
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if (!image) {
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return nil;
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}
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LOCK(self.codersLock);
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NSArray<id<SDWebImageCoder>> *coders = self.coders;
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UNLOCK(self.codersLock);
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for (id<SDWebImageCoder> coder in coders.reverseObjectEnumerator) {
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if ([coder canEncodeToFormat:format]) {
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return [coder encodedDataWithImage:image format:format];
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}
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}
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return nil;
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}
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@end
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