SDWebImageCodersManager.m
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/*
* This file is part of the SDWebImage package.
* (c) Olivier Poitrey <rs@dailymotion.com>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
#import "SDWebImageCodersManager.h"
#import "SDWebImageImageIOCoder.h"
#import "SDWebImageGIFCoder.h"
#ifdef SD_WEBP
#import "SDWebImageWebPCoder.h"
#endif
#define LOCK(lock) dispatch_semaphore_wait(lock, DISPATCH_TIME_FOREVER);
#define UNLOCK(lock) dispatch_semaphore_signal(lock);
@interface SDWebImageCodersManager ()
@property (nonatomic, strong, nonnull) dispatch_semaphore_t codersLock;
@end
@implementation SDWebImageCodersManager
+ (nonnull instancetype)sharedInstance {
static dispatch_once_t once;
static id instance;
dispatch_once(&once, ^{
instance = [self new];
});
return instance;
}
- (instancetype)init {
if (self = [super init]) {
// initialize with default coders
NSMutableArray<id<SDWebImageCoder>> *mutableCoders = [@[[SDWebImageImageIOCoder sharedCoder]] mutableCopy];
#ifdef SD_WEBP
[mutableCoders addObject:[SDWebImageWebPCoder sharedCoder]];
#endif
_coders = [mutableCoders copy];
_codersLock = dispatch_semaphore_create(1);
}
return self;
}
#pragma mark - Coder IO operations
- (void)addCoder:(nonnull id<SDWebImageCoder>)coder {
if (![coder conformsToProtocol:@protocol(SDWebImageCoder)]) {
return;
}
LOCK(self.codersLock);
NSMutableArray<id<SDWebImageCoder>> *mutableCoders = [self.coders mutableCopy];
if (!mutableCoders) {
mutableCoders = [NSMutableArray array];
}
[mutableCoders addObject:coder];
self.coders = [mutableCoders copy];
UNLOCK(self.codersLock);
}
- (void)removeCoder:(nonnull id<SDWebImageCoder>)coder {
if (![coder conformsToProtocol:@protocol(SDWebImageCoder)]) {
return;
}
LOCK(self.codersLock);
NSMutableArray<id<SDWebImageCoder>> *mutableCoders = [self.coders mutableCopy];
[mutableCoders removeObject:coder];
self.coders = [mutableCoders copy];
UNLOCK(self.codersLock);
}
#pragma mark - SDWebImageCoder
- (BOOL)canDecodeFromData:(NSData *)data {
LOCK(self.codersLock);
NSArray<id<SDWebImageCoder>> *coders = self.coders;
UNLOCK(self.codersLock);
for (id<SDWebImageCoder> coder in coders.reverseObjectEnumerator) {
if ([coder canDecodeFromData:data]) {
return YES;
}
}
return NO;
}
- (BOOL)canEncodeToFormat:(SDImageFormat)format {
LOCK(self.codersLock);
NSArray<id<SDWebImageCoder>> *coders = self.coders;
UNLOCK(self.codersLock);
for (id<SDWebImageCoder> coder in coders.reverseObjectEnumerator) {
if ([coder canEncodeToFormat:format]) {
return YES;
}
}
return NO;
}
- (UIImage *)decodedImageWithData:(NSData *)data {
LOCK(self.codersLock);
NSArray<id<SDWebImageCoder>> *coders = self.coders;
UNLOCK(self.codersLock);
for (id<SDWebImageCoder> coder in coders.reverseObjectEnumerator) {
if ([coder canDecodeFromData:data]) {
return [coder decodedImageWithData:data];
}
}
return nil;
}
- (UIImage *)decompressedImageWithImage:(UIImage *)image
data:(NSData *__autoreleasing _Nullable *)data
options:(nullable NSDictionary<NSString*, NSObject*>*)optionsDict {
if (!image) {
return nil;
}
LOCK(self.codersLock);
NSArray<id<SDWebImageCoder>> *coders = self.coders;
UNLOCK(self.codersLock);
for (id<SDWebImageCoder> coder in coders.reverseObjectEnumerator) {
if ([coder canDecodeFromData:*data]) {
return [coder decompressedImageWithImage:image data:data options:optionsDict];
}
}
return nil;
}
- (NSData *)encodedDataWithImage:(UIImage *)image format:(SDImageFormat)format {
if (!image) {
return nil;
}
LOCK(self.codersLock);
NSArray<id<SDWebImageCoder>> *coders = self.coders;
UNLOCK(self.codersLock);
for (id<SDWebImageCoder> coder in coders.reverseObjectEnumerator) {
if ([coder canEncodeToFormat:format]) {
return [coder encodedDataWithImage:image format:format];
}
}
return nil;
}
@end