Add the new context option, including the cache, loader and coder. They can be used to use custom cache/loader in a more convenient way, instead of creating dummy SDWebImageManager

SDWebImage/Core/SDImageCacheDefine.m

@@ -38,6 +38,14 @@ UIImage * _Nullable SDImageCacheDecodeImageData(NSData * _Nonnull imageData, NSS
     mutableCoderOptions[SDImageCoderWebImageContext] = context;
     SDImageCoderOptions *coderOptions = [mutableCoderOptions copy];
     
+    // Grab the image coder
+    id<SDImageCoder> imageCoder;
+    if ([context[SDWebImageContextImageCoder] conformsToProtocol:@protocol(SDImageCoder)]) {
+        imageCoder = context[SDWebImageContextImageCoder];
+    } else {
+        imageCoder = [SDImageCodersManager sharedManager];
+    }
+    
     if (!decodeFirstFrame) {
         Class animatedImageClass = context[SDWebImageContextAnimatedImageClass];
         // check whether we should use `SDAnimatedImage`
@@ -57,7 +65,7 @@ UIImage * _Nullable SDImageCacheDecodeImageData(NSData * _Nonnull imageData, NSS
         }
     }
     if (!image) {
-        image = [[SDImageCodersManager sharedManager] decodedImageWithData:imageData options:coderOptions];
+        image = [imageCoder decodedImageWithData:imageData options:coderOptions];
     }
     if (image) {
         BOOL shouldDecode = !SD_OPTIONS_CONTAINS(options, SDWebImageAvoidDecodeImage);

SDWebImage/Core/SDImageLoader.m

@@ -52,6 +52,14 @@ UIImage * _Nullable SDImageLoaderDecodeImageData(NSData * _Nonnull imageData, NS
     mutableCoderOptions[SDImageCoderWebImageContext] = context;
     SDImageCoderOptions *coderOptions = [mutableCoderOptions copy];
     
+    // Grab the image coder
+    id<SDImageCoder> imageCoder;
+    if ([context[SDWebImageContextImageCoder] conformsToProtocol:@protocol(SDImageCoder)]) {
+        imageCoder = context[SDWebImageContextImageCoder];
+    } else {
+        imageCoder = [SDImageCodersManager sharedManager];
+    }
+    
     if (!decodeFirstFrame) {
         // check whether we should use `SDAnimatedImage`
         Class animatedImageClass = context[SDWebImageContextAnimatedImageClass];
@@ -71,7 +79,7 @@ UIImage * _Nullable SDImageLoaderDecodeImageData(NSData * _Nonnull imageData, NS
         }
     }
     if (!image) {
-        image = [[SDImageCodersManager sharedManager] decodedImageWithData:imageData options:coderOptions];
+        image = [imageCoder decodedImageWithData:imageData options:coderOptions];
     }
     if (image) {
         BOOL shouldDecode = !SD_OPTIONS_CONTAINS(options, SDWebImageAvoidDecodeImage);
@@ -127,16 +135,23 @@ UIImage * _Nullable SDImageLoaderDecodeProgressiveImageData(NSData * _Nonnull im
     mutableCoderOptions[SDImageCoderWebImageContext] = context;
     SDImageCoderOptions *coderOptions = [mutableCoderOptions copy];
     
+    // Grab the progressive image coder
     id<SDProgressiveImageCoder> progressiveCoder = objc_getAssociatedObject(operation, SDImageLoaderProgressiveCoderKey);
     if (!progressiveCoder) {
+        id<SDProgressiveImageCoder> imageCoder = context[SDWebImageContextImageCoder];
+        // Check the progressive coder if provided
+        if ([imageCoder conformsToProtocol:@protocol(SDProgressiveImageCoder)]) {
+            progressiveCoder = [[[imageCoder class] alloc] initIncrementalWithOptions:coderOptions];
+        } else {
             // We need to create a new instance for progressive decoding to avoid conflicts
-        for (id<SDImageCoder>coder in [SDImageCodersManager sharedManager].coders.reverseObjectEnumerator) {
+            for (id<SDImageCoder> coder in [SDImageCodersManager sharedManager].coders.reverseObjectEnumerator) {
                 if ([coder conformsToProtocol:@protocol(SDProgressiveImageCoder)] &&
                     [((id<SDProgressiveImageCoder>)coder) canIncrementalDecodeFromData:imageData]) {
                     progressiveCoder = [[[coder class] alloc] initIncrementalWithOptions:coderOptions];
                     break;
                 }
             }
+        }
         objc_setAssociatedObject(operation, SDImageLoaderProgressiveCoderKey, progressiveCoder, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
     }
     // If we can't find any progressive coder, disable progressive download

SDWebImage/Core/SDWebImageDefine.h

@@ -213,9 +213,29 @@ FOUNDATION_EXPORT SDWebImageContextOption _Nonnull const SDWebImageContextSetIma
 
 /**
  A SDWebImageManager instance to control the image download and cache process using in UIImageView+WebCache category and likes. If not provided, use the shared manager (SDWebImageManager *)
+ @note Consider deprecated. This context options can be replaced by other context option control like `.imageCache`, `.imageLoader`, `.imageTransofmer` (See below), which already matches all the properties in SDWebImageManager.
  */
 FOUNDATION_EXPORT SDWebImageContextOption _Nonnull const SDWebImageContextCustomManager;
 
+/**
+ A id<SDImageCache> instance which conforms to `SDImageCache` protocol. It's used to override the image mananger's cache during the image loading pipeline.
+ In other word, if you just want to specify a custom cache during image loading, you don't need to re-create a dummy SDWebImageManager instance with the cache. If not provided, use the image manager's cache (id<SDImageCache>)
+ */
+FOUNDATION_EXPORT SDWebImageContextOption _Nonnull const SDWebImageContextImageCache;
+
+/**
+ A id<SDImageLoader> instance which conforms to `SDImageLoader` protocol. It's used to override the image mananger's loader during the image loading pipeline.
+ In other word, if you just want to specify a custom loader during image loading, you don't need to re-create a dummy SDWebImageManager instance with the loader. If not provided, use the image manager's cache (id<SDImageLoader>)
+*/
+FOUNDATION_EXPORT SDWebImageContextOption _Nonnull const SDWebImageContextImageLoader;
+
+/**
+ A id<SDImageCoder> instance which conforms to `SDImageCoder` protocol. It's used to override the default image codre for image decoding(including progressive) and encoding during the image loading process.
+ If you use this context option, we will not always use `SDImageCodersManager.shared` to loop through all registered coders and find the suitable one. Instead, we will arbitrarily use the exact provided coder without extra checking (We may not call `canDecodeFromData:`).
+ @note This is only useful for cases which you can ensure the loading url matches your coder, or you find it's too hard to write a common coder which can used for generic usage. This will bind the loading url with the coder logic, which is not always a good design, but possible. (id<SDImageCache>)
+*/
+FOUNDATION_EXPORT SDWebImageContextOption _Nonnull const SDWebImageContextImageCoder;
+
 /**
  A id<SDImageTransformer> instance which conforms `SDImageTransformer` protocol. It's used for image transform after the image load finished and store the transformed image to cache. If you provide one, it will ignore the `transformer` in manager and use provided one instead. (id<SDImageTransformer>)
  */

SDWebImage/Core/SDWebImageDefine.m

@@ -120,6 +120,9 @@ inline UIImage * _Nullable SDScaledImageForScaleFactor(CGFloat scale, UIImage *
 
 SDWebImageContextOption const SDWebImageContextSetImageOperationKey = @"setImageOperationKey";
 SDWebImageContextOption const SDWebImageContextCustomManager = @"customManager";
+SDWebImageContextOption const SDWebImageContextImageCache = @"imageCache";
+SDWebImageContextOption const SDWebImageContextImageLoader = @"imageLoader";
+SDWebImageContextOption const SDWebImageContextImageCoder = @"imageCoder";
 SDWebImageContextOption const SDWebImageContextImageTransformer = @"imageTransformer";
 SDWebImageContextOption const SDWebImageContextImageScaleFactor = @"imageScaleFactor";
 SDWebImageContextOption const SDWebImageContextImagePreserveAspectRatio = @"imagePreserveAspectRatio";

SDWebImage/Core/SDWebImageManager.m

@@ -211,12 +211,19 @@ static id<SDImageLoader> _defaultImageLoader;
                              context:(nullable SDWebImageContext *)context
                             progress:(nullable SDImageLoaderProgressBlock)progressBlock
                            completed:(nullable SDInternalCompletionBlock)completedBlock {
+    // Grab the image cache to use
+    id<SDImageCache> imageCache;
+    if ([context[SDWebImageContextImageCache] conformsToProtocol:@protocol(SDImageCache)]) {
+        imageCache = context[SDWebImageContextImageCache];
+    } else {
+        imageCache = self.imageCache;
+    }
     // Check whether we should query cache
     BOOL shouldQueryCache = !SD_OPTIONS_CONTAINS(options, SDWebImageFromLoaderOnly);
     if (shouldQueryCache) {
         NSString *key = [self cacheKeyForURL:url context:context];
         @weakify(operation);
-        operation.cacheOperation = [self.imageCache queryImageForKey:key options:options context:context completion:^(UIImage * _Nullable cachedImage, NSData * _Nullable cachedData, SDImageCacheType cacheType) {
+        operation.cacheOperation = [imageCache queryImageForKey:key options:options context:context completion:^(UIImage * _Nullable cachedImage, NSData * _Nullable cachedData, SDImageCacheType cacheType) {
             @strongify(operation);
             if (!operation || operation.isCancelled) {
                 // Image combined operation cancelled by user
@@ -243,11 +250,18 @@ static id<SDImageLoader> _defaultImageLoader;
                               cacheType:(SDImageCacheType)cacheType
                                progress:(nullable SDImageLoaderProgressBlock)progressBlock
                               completed:(nullable SDInternalCompletionBlock)completedBlock {
+    // Grab the image loader to use
+    id<SDImageLoader> imageLoader;
+    if ([context[SDWebImageContextImageLoader] conformsToProtocol:@protocol(SDImageLoader)]) {
+        imageLoader = context[SDWebImageContextImageLoader];
+    } else {
+        imageLoader = self.imageLoader;
+    }
     // Check whether we should download image from network
     BOOL shouldDownload = !SD_OPTIONS_CONTAINS(options, SDWebImageFromCacheOnly);
     shouldDownload &= (!cachedImage || options & SDWebImageRefreshCached);
     shouldDownload &= (![self.delegate respondsToSelector:@selector(imageManager:shouldDownloadImageForURL:)] || [self.delegate imageManager:self shouldDownloadImageForURL:url]);
-    shouldDownload &= [self.imageLoader canRequestImageForURL:url];
+    shouldDownload &= [imageLoader canRequestImageForURL:url];
     if (shouldDownload) {
         if (cachedImage && options & SDWebImageRefreshCached) {
             // If image was found in the cache but SDWebImageRefreshCached is provided, notify about the cached image
@@ -265,7 +279,7 @@ static id<SDImageLoader> _defaultImageLoader;
         }
         
         @weakify(operation);
-        operation.loaderOperation = [self.imageLoader requestImageWithURL:url options:options context:context progress:progressBlock completed:^(UIImage *downloadedImage, NSData *downloadedData, NSError *error, BOOL finished) {
+        operation.loaderOperation = [imageLoader requestImageWithURL:url options:options context:context progress:progressBlock completed:^(UIImage *downloadedImage, NSData *downloadedData, NSError *error, BOOL finished) {
             @strongify(operation);
             if (!operation || operation.isCancelled) {
                 // Image combined operation cancelled by user
@@ -277,7 +291,7 @@ static id<SDImageLoader> _defaultImageLoader;
                 [self callCompletionBlockForOperation:operation completion:completedBlock error:error url:url];
             } else if (error) {
                 [self callCompletionBlockForOperation:operation completion:completedBlock error:error url:url];
-                BOOL shouldBlockFailedURL = [self shouldBlockFailedURLWithURL:url error:error];
+                BOOL shouldBlockFailedURL = [self shouldBlockFailedURLWithURL:url error:error options:options context:context];
                 
                 if (shouldBlockFailedURL) {
                     SD_LOCK(self.failedURLsLock);
@@ -336,7 +350,6 @@ static id<SDImageLoader> _defaultImageLoader;
     shouldTransformImage = shouldTransformImage && (!downloadedImage.sd_isAnimated || (options & SDWebImageTransformAnimatedImage));
     shouldTransformImage = shouldTransformImage && (!downloadedImage.sd_isVector || (options & SDWebImageTransformVectorImage));
     BOOL shouldCacheOriginal = downloadedImage && finished;
-    BOOL waitStoreCache = SD_OPTIONS_CONTAINS(options, SDWebImageWaitStoreCache);
     
     // if available, store original image to cache
     if (shouldCacheOriginal) {
@@ -346,14 +359,14 @@ static id<SDImageLoader> _defaultImageLoader;
             dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0), ^{
                 @autoreleasepool {
                     NSData *cacheData = [cacheSerializer cacheDataWithImage:downloadedImage originalData:downloadedData imageURL:url];
-                    [self storeImage:downloadedImage imageData:cacheData forKey:key cacheType:targetStoreCacheType waitStoreCache:waitStoreCache completion:^{
+                    [self storeImage:downloadedImage imageData:cacheData forKey:key cacheType:targetStoreCacheType options:options context:context completion:^{
                         // Continue transform process
                         [self callTransformProcessForOperation:operation url:url options:options context:context originalImage:downloadedImage originalData:downloadedData finished:finished progress:progressBlock completed:completedBlock];
                     }];
                 }
             });
         } else {
-            [self storeImage:downloadedImage imageData:downloadedData forKey:key cacheType:targetStoreCacheType waitStoreCache:waitStoreCache completion:^{
+            [self storeImage:downloadedImage imageData:downloadedData forKey:key cacheType:targetStoreCacheType options:options context:context completion:^{
                 // Continue transform process
                 [self callTransformProcessForOperation:operation url:url options:options context:context originalImage:downloadedImage originalData:downloadedData finished:finished progress:progressBlock completed:completedBlock];
             }];
@@ -385,7 +398,6 @@ static id<SDImageLoader> _defaultImageLoader;
     BOOL shouldTransformImage = originalImage && transformer;
     shouldTransformImage = shouldTransformImage && (!originalImage.sd_isAnimated || (options & SDWebImageTransformAnimatedImage));
     shouldTransformImage = shouldTransformImage && (!originalImage.sd_isVector || (options & SDWebImageTransformVectorImage));
-    BOOL waitStoreCache = SD_OPTIONS_CONTAINS(options, SDWebImageWaitStoreCache);
     // if available, store transformed image to cache
     if (shouldTransformImage) {
         dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0), ^{
@@ -404,7 +416,7 @@ static id<SDImageLoader> _defaultImageLoader;
                     }
                     // keep the original image format and extended data
                     SDImageCopyAssociatedObject(originalImage, transformedImage);
-                    [self storeImage:transformedImage imageData:cacheData forKey:cacheKey cacheType:storeCacheType waitStoreCache:waitStoreCache completion:^{
+                    [self storeImage:transformedImage imageData:cacheData forKey:cacheKey cacheType:storeCacheType options:options context:context completion:^{
                         [self callCompletionBlockForOperation:operation completion:completedBlock image:transformedImage data:originalData error:nil cacheType:SDImageCacheTypeNone finished:finished url:url];
                     }];
                 } else {
@@ -432,10 +444,18 @@ static id<SDImageLoader> _defaultImageLoader;
          imageData:(nullable NSData *)data
             forKey:(nullable NSString *)key
          cacheType:(SDImageCacheType)cacheType
-    waitStoreCache:(BOOL)waitStoreCache
+           options:(SDWebImageOptions)options
+           context:(nullable SDWebImageContext *)context
         completion:(nullable SDWebImageNoParamsBlock)completion {
+    id<SDImageCache> imageCache;
+    if ([context[SDWebImageContextImageCache] conformsToProtocol:@protocol(SDImageCache)]) {
+        imageCache = context[SDWebImageContextImageCache];
+    } else {
+        imageCache = self.imageCache;
+    }
+    BOOL waitStoreCache = SD_OPTIONS_CONTAINS(options, SDWebImageWaitStoreCache);
     // Check whether we should wait the store cache finished. If not, callback immediately
-    [self.imageCache storeImage:image imageData:data forKey:key cacheType:cacheType completion:^{
+    [imageCache storeImage:image imageData:data forKey:key cacheType:cacheType completion:^{
         if (waitStoreCache) {
             if (completion) {
                 completion();
@@ -472,13 +492,24 @@ static id<SDImageLoader> _defaultImageLoader;
 }
 
 - (BOOL)shouldBlockFailedURLWithURL:(nonnull NSURL *)url
-                              error:(nonnull NSError *)error {
+                              error:(nonnull NSError *)error
+                            options:(SDWebImageOptions)options
+                            context:(nullable SDWebImageContext *)context {
+    if ((options & SDWebImageRetryFailed)) {
+        return NO;
+    }
+    id<SDImageLoader> imageLoader;
+    if ([context[SDWebImageContextImageLoader] conformsToProtocol:@protocol(SDImageLoader)]) {
+        imageLoader = context[SDWebImageContextImageLoader];
+    } else {
+        imageLoader = self.imageLoader;
+    }
     // Check whether we should block failed url
     BOOL shouldBlockFailedURL;
     if ([self.delegate respondsToSelector:@selector(imageManager:shouldBlockFailedURL:withError:)]) {
         shouldBlockFailedURL = [self.delegate imageManager:self shouldBlockFailedURL:url withError:error];
     } else {
-        shouldBlockFailedURL = [self.imageLoader shouldBlockFailedURLWithURL:url error:error];
+        shouldBlockFailedURL = [imageLoader shouldBlockFailedURLWithURL:url error:error];
     }
     
     return shouldBlockFailedURL;