Revert "delete RCTUIUtils (facebook#49453)"

This reverts commit 49b7ce0.

Author: riteshshukla04

packages/react-native/React/CoreModules/RCTDeviceInfo.mm

@@ -14,6 +14,7 @@
 #import <React/RCTEventDispatcherProtocol.h>
 #import <React/RCTInitializing.h>
 #import <React/RCTInvalidating.h>
+#import <React/RCTUIUtils.h>
 #import <React/RCTUtils.h>
 #import <atomic>
 
@@ -174,25 +175,20 @@ static BOOL RCTIsIPhoneNotched()
 static NSDictionary *RCTExportedDimensions(CGFloat fontScale)
 {
   RCTAssertMainQueue();
-  UIScreen *mainScreen = UIScreen.mainScreen;
-  CGSize screenSize = mainScreen.bounds.size;
-  UIView *mainWindow = RCTKeyWindow();
-
-  // We fallback to screen size if a key window is not found.
-  CGSize windowSize = mainWindow ? mainWindow.bounds.size : screenSize;
-
+  RCTDimensions dimensions = RCTGetDimensions(fontScale);
+  __typeof(dimensions.window) window = dimensions.window;
   NSDictionary<NSString *, NSNumber *> *dimsWindow = @{
-    @"width" : @(windowSize.width),
-    @"height" : @(windowSize.height),
-    @"scale" : @(mainScreen.scale),
-    @"fontScale" : @(fontScale)
+    @"width" : @(window.width),
+    @"height" : @(window.height),
+    @"scale" : @(window.scale),
+    @"fontScale" : @(window.fontScale)
   };
-
+  __typeof(dimensions.screen) screen = dimensions.screen;
   NSDictionary<NSString *, NSNumber *> *dimsScreen = @{
-    @"width" : @(screenSize.width),
-    @"height" : @(screenSize.height),
-    @"scale" : @(mainScreen.scale),
-    @"fontScale" : @(fontScale)
+    @"width" : @(screen.width),
+    @"height" : @(screen.height),
+    @"scale" : @(screen.scale),
+    @"fontScale" : @(screen.fontScale)
   };
   return @{@"window" : dimsWindow, @"screen" : dimsScreen};
 }

packages/react-native/React/UIUtils/RCTUIUtils.h

@@ -0,0 +1,30 @@
+/*
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+#import <CoreGraphics/CoreGraphics.h>
+#import <Foundation/Foundation.h>
+#import <UIKit/UIKit.h>
+
+NS_ASSUME_NONNULL_BEGIN
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+// Get window and screen dimensions
+typedef struct {
+  struct {
+    CGFloat width, height, scale, fontScale;
+  } window, screen;
+} RCTDimensions;
+extern __attribute__((visibility("default"))) RCTDimensions RCTGetDimensions(CGFloat fontScale);
+
+#ifdef __cplusplus
+}
+#endif
+
+NS_ASSUME_NONNULL_END

packages/react-native/React/UIUtils/RCTUIUtils.m

@@ -0,0 +1,30 @@
+/*
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+#import "RCTUIUtils.h"
+
+#import "RCTUtils.h"
+
+RCTDimensions RCTGetDimensions(CGFloat fontScale)
+{
+  UIScreen *mainScreen = UIScreen.mainScreen;
+  CGSize screenSize = mainScreen.bounds.size;
+
+  UIView *mainWindow = RCTKeyWindow();
+  // We fallback to screen size if a key window is not found.
+  CGSize windowSize = mainWindow ? mainWindow.bounds.size : screenSize;
+
+  RCTDimensions result;
+  typeof(result.screen) dimsScreen = {
+      .width = screenSize.width, .height = screenSize.height, .scale = mainScreen.scale, .fontScale = fontScale};
+  typeof(result.window) dimsWindow = {
+      .width = windowSize.width, .height = windowSize.height, .scale = mainScreen.scale, .fontScale = fontScale};
+  result.screen = dimsScreen;
+  result.window = dimsWindow;
+
+  return result;
+}