127 lines
3.6 KiB
Objective-C
127 lines
3.6 KiB
Objective-C
/*
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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 "SDImageCodersManager.h"
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#import "SDImageIOCoder.h"
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#import "SDImageGIFCoder.h"
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#import "SDImageAPNGCoder.h"
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@interface SDImageCodersManager ()
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@property (nonatomic, strong, nonnull) dispatch_semaphore_t codersLock;
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@end
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@implementation SDImageCodersManager
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+ (nonnull instancetype)sharedManager {
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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<SDImageCoder>> *mutableCoders = [@[[SDImageIOCoder sharedCoder], [SDImageGIFCoder sharedCoder], [SDImageAPNGCoder sharedCoder]] mutableCopy];
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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<SDImageCoder>)coder {
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if (![coder conformsToProtocol:@protocol(SDImageCoder)]) {
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return;
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}
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SD_LOCK(self.codersLock);
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NSMutableArray<id<SDImageCoder>> *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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SD_UNLOCK(self.codersLock);
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}
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- (void)removeCoder:(nonnull id<SDImageCoder>)coder {
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if (![coder conformsToProtocol:@protocol(SDImageCoder)]) {
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return;
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}
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SD_LOCK(self.codersLock);
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NSMutableArray<id<SDImageCoder>> *mutableCoders = [self.coders mutableCopy];
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[mutableCoders removeObject:coder];
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self.coders = [mutableCoders copy];
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SD_UNLOCK(self.codersLock);
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}
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#pragma mark - SDImageCoder
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- (BOOL)canDecodeFromData:(NSData *)data {
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SD_LOCK(self.codersLock);
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NSArray<id<SDImageCoder>> *coders = self.coders;
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SD_UNLOCK(self.codersLock);
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for (id<SDImageCoder> 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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SD_LOCK(self.codersLock);
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NSArray<id<SDImageCoder>> *coders = self.coders;
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SD_UNLOCK(self.codersLock);
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for (id<SDImageCoder> 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 options:(nullable SDImageCoderOptions *)options {
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if (!data) {
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return nil;
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}
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UIImage *image;
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SD_LOCK(self.codersLock);
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NSArray<id<SDImageCoder>> *coders = self.coders;
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SD_UNLOCK(self.codersLock);
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for (id<SDImageCoder> coder in coders.reverseObjectEnumerator) {
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if ([coder canDecodeFromData:data]) {
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image = [coder decodedImageWithData:data options:options];
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break;
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}
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}
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return image;
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}
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- (NSData *)encodedDataWithImage:(UIImage *)image format:(SDImageFormat)format options:(nullable SDImageCoderOptions *)options {
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if (!image) {
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return nil;
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}
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SD_LOCK(self.codersLock);
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NSArray<id<SDImageCoder>> *coders = self.coders;
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SD_UNLOCK(self.codersLock);
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for (id<SDImageCoder> coder in coders.reverseObjectEnumerator) {
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if ([coder canEncodeToFormat:format]) {
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return [coder encodedDataWithImage:image format:format options:options];
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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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