Add pluggable image processing system

Examples/UIExplorer/UIExplorerUnitTests/RCTImageLoaderHelpers.m

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+/**
+ * The examples provided by Facebook are for non-commercial testing and
+ * evaluation purposes only.
+ *
+ * Facebook reserves all rights not expressly granted.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NON INFRINGEMENT. IN NO EVENT SHALL
+ * FACEBOOK BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#import "RCTImageLoaderHelpers.h"
+
+@implementation RCTConcreteImageURLLoader
+{
+  RCTImageURLLoaderCanLoadImageURLHandler _canLoadImageURLHandler;
+  RCTImageURLLoaderLoadImageURLHandler _loadImageURLHandler;
+  float _priority;
+}
+
++ (NSString *)moduleName
+{
+  return nil;
+}
+
+- (instancetype)init
+{
+  return nil;
+}
+
+- (instancetype)initWithPriority:(float)priority canLoadImageURLHandler:(RCTImageURLLoaderCanLoadImageURLHandler)canLoadImageURLHandler loadImageURLHandler:(RCTImageURLLoaderLoadImageURLHandler)loadImageURLHandler
+{
+  if ((self = [super init])) {
+    _canLoadImageURLHandler = [canLoadImageURLHandler copy];
+    _loadImageURLHandler = [loadImageURLHandler copy];
+    _priority = priority;
+  }
+
+  return self;
+}
+
+- (BOOL)canLoadImageURL:(NSURL *)requestURL
+{
+  return _canLoadImageURLHandler(requestURL);
+}
+
+- (RCTImageLoaderCancellationBlock)loadImageForURL:(NSURL *)imageURL size:(CGSize)size scale:(CGFloat)scale resizeMode:(UIViewContentMode)resizeMode progressHandler:(RCTImageLoaderProgressBlock)progressHandler completionHandler:(RCTImageLoaderCompletionBlock)completionHandler
+{
+  return _loadImageURLHandler(imageURL, size, scale, resizeMode, progressHandler, completionHandler);
+}
+
+- (float)imageLoaderPriority
+{
+  return _priority;
+}
+
+@end
+
+@implementation RCTConcreteImageDecoder
+{
+  RCTImageDecoderCanDecodeImageDataHandler _canDecodeImageDataHandler;
+  RCTImageDecoderDecodeImageDataHandler _decodeImageDataHandler;
+  float _priority;
+}
+
++ (NSString *)moduleName
+{
+  return nil;
+}
+
+- (instancetype)init
+{
+  return nil;
+}
+
+- (instancetype)initWithPriority:(float)priority canDecodeImageDataHandler:(RCTImageDecoderCanDecodeImageDataHandler)canDecodeImageDataHandler decodeImageDataHandler:(RCTImageDecoderDecodeImageDataHandler)decodeImageDataHandler
+{
+  if ((self = [super init])) {
+    _canDecodeImageDataHandler = [canDecodeImageDataHandler copy];
+    _decodeImageDataHandler = [decodeImageDataHandler copy];
+    _priority = priority;
+  }
+
+  return self;
+}
+
+- (BOOL)canDecodeImageData:(NSData *)imageData
+{
+  return _canDecodeImageDataHandler(imageData);
+}
+
+- (RCTImageLoaderCancellationBlock)decodeImageData:(NSData *)imageData size:(CGSize)size scale:(CGFloat)scale resizeMode:(UIViewContentMode)resizeMode completionHandler:(RCTImageLoaderCompletionBlock)completionHandler
+{
+  return _decodeImageDataHandler(imageData, size, scale, resizeMode, completionHandler);
+}
+
+- (float)imageDecoderPriority
+{
+  return _priority;
+}
+
+@end