Test perf effect of reverting D3269333

Reviewed By: javache

Differential Revision: D3346235

fbshipit-source-id: 2008f8fb9df5d61da59bb0067b25acd5a71f256f

Libraries/Image/RCTShadowVirtualImage.m

@@ -0,0 +1,82 @@
+/**
+ * Copyright (c) 2015-present, Facebook, Inc.
+ * All rights reserved.
+ *
+ * This source code is licensed under the BSD-style license found in the
+ * LICENSE file in the root directory of this source tree. An additional grant
+ * of patent rights can be found in the PATENTS file in the same directory.
+ */
+
+#import "RCTShadowVirtualImage.h"
+#import "RCTImageLoader.h"
+#import "RCTImageUtils.h"
+#import "RCTBridge.h"
+#import "RCTConvert.h"
+#import "RCTUIManager.h"
+#import "RCTUtils.h"
+
+@implementation RCTShadowVirtualImage
+{
+  RCTBridge *_bridge;
+  RCTImageLoaderCancellationBlock _cancellationBlock;
+}
+
+@synthesize image = _image;
+
+- (instancetype)initWithBridge:(RCTBridge *)bridge
+{
+  if ((self = [super init])) {
+    _bridge = bridge;
+  }
+  return self;
+}
+
+RCT_NOT_IMPLEMENTED(-(instancetype)init)
+
+- (void)didSetProps:(NSArray<NSString *> *)changedProps
+{
+  [super didSetProps:changedProps];
+
+  if (changedProps.count == 0) {
+    // No need to reload image
+    return;
+  }
+
+  // Cancel previous request
+  if (_cancellationBlock) {
+    _cancellationBlock();
+  }
+
+  CGSize imageSize = {
+    RCTZeroIfNaN(self.width),
+    RCTZeroIfNaN(self.height),
+  };
+
+  __weak RCTShadowVirtualImage *weakSelf = self;
+  _cancellationBlock = [_bridge.imageLoader loadImageWithTag:_source.imageURL.absoluteString
+                                                        size:imageSize
+                                                       scale:RCTScreenScale()
+                                                  resizeMode:_resizeMode
+                                               progressBlock:nil
+                                             completionBlock:^(NSError *error, UIImage *image) {
+
+    dispatch_async(_bridge.uiManager.methodQueue, ^{
+      RCTShadowVirtualImage *strongSelf = weakSelf;
+      if (![_source isEqual:strongSelf.source]) {
+        // Bail out if source has changed since we started loading
+        return;
+      }
+      strongSelf->_image = image;
+      [strongSelf dirtyText];
+    });
+  }];
+}
+
+- (void)dealloc
+{
+  if (_cancellationBlock) {
+    _cancellationBlock();
+  }
+}
+
+@end